Protein complexes that take part in the process of PHOTOSYNTHESIS. They are located within the THYLAKOID MEMBRANES of plant CHLOROPLASTS and a variety of structures in more primitive organisms. There are two major complexes involved in the photosynthetic process called PHOTOSYSTEM I and PHOTOSYSTEM II.
Spherical phototrophic bacteria found in mud and stagnant water exposed to light.
Complexes containing CHLOROPHYLL and other photosensitive molecules. They serve to capture energy in the form of PHOTONS and are generally found as components of the PHOTOSYSTEM I PROTEIN COMPLEX or the PHOTOSYSTEM II PROTEIN COMPLEX.
Pyrrole containing pigments found in photosynthetic bacteria.
A genus of gram-negative, rod-shaped, phototrophic bacteria found in aquatic environments. Internal photosynthetic membranes are present as lamellae underlying the cytoplasmic membrane.
A large multisubunit protein complex found in the THYLAKOID MEMBRANE. It uses light energy derived from LIGHT-HARVESTING PROTEIN COMPLEXES to catalyze the splitting of WATER into DIOXYGEN and of reducing equivalents of HYDROGEN.
The process by which ELECTRONS are transported from a reduced substrate to molecular OXYGEN. (From Bennington, Saunders Dictionary and Encyclopedia of Laboratory Medicine and Technology, 1984, p270)
The synthesis by organisms of organic chemical compounds, especially carbohydrates, from carbon dioxide using energy obtained from light rather than from the oxidation of chemical compounds. Photosynthesis comprises two separate processes: the light reactions and the dark reactions. In higher plants; GREEN ALGAE; and CYANOBACTERIA; NADPH and ATP formed by the light reactions drive the dark reactions which result in the fixation of carbon dioxide. (from Oxford Dictionary of Biochemistry and Molecular Biology, 2001)
Porphyrin derivatives containing magnesium that act to convert light energy in photosynthetic organisms.
Chlorophylls from which the magnesium has been removed by treatment with weak acid.
A large multisubunit protein complex that is found in the THYLAKOID MEMBRANE. It uses light energy derived from LIGHT-HARVESTING PROTEIN COMPLEXES to drive electron transfer reactions that result in either the reduction of NADP to NADPH or the transport of PROTONS across the membrane.
That portion of the electromagnetic spectrum in the visible, ultraviolet, and infrared range.
A phylum of oxygenic photosynthetic bacteria comprised of unicellular to multicellular bacteria possessing CHLOROPHYLL a and carrying out oxygenic PHOTOSYNTHESIS. Cyanobacteria are the only known organisms capable of fixing both CARBON DIOXIDE (in the presence of light) and NITROGEN. Cell morphology can include nitrogen-fixing heterocysts and/or resting cells called akinetes. Formerly called blue-green algae, cyanobacteria were traditionally treated as ALGAE.
Type C cytochromes that are small (12-14 kD) single-heme proteins. They function as mobile electron carriers between membrane-bound enzymes in photosynthetic BACTERIA.
A phylum of anoxygenic, phototrophic bacteria including the family Chlorobiaceae. They occur in aquatic sediments, sulfur springs, and hot springs and utilize reduced sulfur compounds instead of oxygen.
Hydrocarbon rings which contain two ketone moieties in any position. They can be substituted in any position except at the ketone groups.
The art or process of comparing photometrically the relative intensities of the light in different parts of the spectrum.
The transfer of energy of a given form among different scales of motion. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed). It includes the transfer of kinetic energy and the transfer of chemical energy. The transfer of chemical energy from one molecule to another depends on proximity of molecules so it is often used as in techniques to measure distance such as the use of FORSTER RESONANCE ENERGY TRANSFER.
A widely cultivated plant, native to Asia, having succulent, edible leaves eaten as a vegetable. (From American Heritage Dictionary, 1982)
A genus of gram-negative bacteria widely distributed in fresh water as well as marine and hypersaline habitats.
Proteins found in any species of bacterium.
A phylum of bacteria consisting of the purple bacteria and their relatives which form a branch of the eubacterial tree. This group of predominantly gram-negative bacteria is classified based on homology of equivalent nucleotide sequences of 16S ribosomal RNA or by hybridization of ribosomal RNA or DNA with 16S and 23S ribosomal RNA.
A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471).
A genus in the family ACETOBACTERACEAE consisting of chemoorganotrophic, straight rods with rounded ends. They are aerobic and acidophilic.
A family in the order Rhizobiales, class ALPHAPROTEOBACTERIA comprised of many genera of budding or appendaged bacteria.
Stable elementary particles having the smallest known negative charge, present in all elements; also called negatrons. Positively charged electrons are called positrons. The numbers, energies and arrangement of electrons around atomic nuclei determine the chemical identities of elements. Beams of electrons are called CATHODE RAYS.
Organelles of phototrophic bacteria which contain photosynthetic pigments and which are formed from an invagination of the cytoplasmic membrane.
Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.
A genus of phototrophic, obligately anaerobic bacteria in the family Chlorobiaceae. They are found in hydrogen sulfide-containing mud and water environments.
A lipid-soluble benzoquinone which is involved in ELECTRON TRANSPORT in mitochondrial preparations. The compound occurs in the majority of aerobic organisms, from bacteria to higher plants and animals.
The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION.
A genus of EUKARYOTES, in the phylum EUGLENIDA, found mostly in stagnant water. Characteristics include a pellicle usually marked by spiral or longitudinal striations.
The rate dynamics in chemical or physical systems.
Proteins, usually acting in oxidation-reduction reactions, containing iron but no porphyrin groups. (Lehninger, Principles of Biochemistry, 1993, pG-10)
A family of phototrophic bacteria, in the order Rhodospirillales, isolated from stagnant water and mud.
A pre-emergent herbicide.
The measurement of the amplitude of the components of a complex waveform throughout the frequency range of the waveform. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
A specific bacteriochlorophyll that is similar in structure to chlorophyll a.
Stable elementary particles having the smallest known positive charge, found in the nuclei of all elements. The proton mass is less than that of a neutron. A proton is the nucleus of the light hydrogen atom, i.e., the hydrogen ion.
A family of phototrophic purple sulfur bacteria that deposit globules of elemental sulfur inside their cells. They are found in diverse aquatic environments.
Models used experimentally or theoretically to study molecular shape, electronic properties, or interactions; includes analogous molecules, computer-generated graphics, and mechanical structures.
Non-pathogenic ovoid to rod-shaped bacteria that are widely distributed and found in fresh water as well as marine and hypersaline habitats.
A group of cytochromes with covalent thioether linkages between either or both of the vinyl side chains of protoheme and the protein. (Enzyme Nomenclature, 1992, p539)
A genus of facultatively or obligately anaerobic marine phototrophic bacteria, in the family RHODOBACTERACEAE.
The characteristic 3-dimensional shape of a protein, including the secondary, supersecondary (motifs), tertiary (domains) and quaternary structure of the peptide chain. PROTEIN STRUCTURE, QUATERNARY describes the conformation assumed by multimeric proteins (aggregates of more than one polypeptide chain).
The study of chemical changes resulting from electrical action and electrical activity resulting from chemical changes.
A genus of gram-negative, ovoid to rod-shaped bacteria that is phototrophic. All species use ammonia as a nitrogen source. Some strains are found only in sulfide-containing freshwater habitats exposed to light while others may occur in marine, estuarine, and freshwater environments.
A rigorously mathematical analysis of energy relationships (heat, work, temperature, and equilibrium). It describes systems whose states are determined by thermal parameters, such as temperature, in addition to mechanical and electromagnetic parameters. (From Hawley's Condensed Chemical Dictionary, 12th ed)
A technique applicable to the wide variety of substances which exhibit paramagnetism because of the magnetic moments of unpaired electrons. The spectra are useful for detection and identification, for determination of electron structure, for study of interactions between molecules, and for measurement of nuclear spins and moments. (From McGraw-Hill Encyclopedia of Science and Technology, 7th edition) Electron nuclear double resonance (ENDOR) spectroscopy is a variant of the technique which can give enhanced resolution. Electron spin resonance analysis can now be used in vivo, including imaging applications such as MAGNETIC RESONANCE IMAGING.
Electrophoresis in which a polyacrylamide gel is used as the diffusion medium.
Theoretical representations that simulate the behavior or activity of chemical processes or phenomena; includes the use of mathematical equations, computers, and other electronic equipment.
A group of proteins possessing only the iron-sulfur complex as the prosthetic group. These proteins participate in all major pathways of electron transport: photosynthesis, respiration, hydroxylation and bacterial hydrogen and nitrogen fixation.
Hemeproteins whose characteristic mode of action involves transfer of reducing equivalents which are associated with a reversible change in oxidation state of the prosthetic group. Formally, this redox change involves a single-electron, reversible equilibrium between the Fe(II) and Fe(III) states of the central iron atom (From Enzyme Nomenclature, 1992, p539). The various cytochrome subclasses are organized by the type of HEME and by the wavelength range of their reduced alpha-absorption bands.
The accumulation of an electric charge on a object
Benzene rings which contain two ketone moieties in any position. They can be substituted in any position except at the ketone groups.
Proteins that form the structure of the NUCLEAR PORE. They are involved in active, facilitated and passive transport of molecules in and out of the CELL NUCLEUS.
The study of crystal structure using X-RAY DIFFRACTION techniques. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
A low-energy attractive force between hydrogen and another element. It plays a major role in determining the properties of water, proteins, and other compounds.
The color-furnishing portion of hemoglobin. It is found free in tissues and as the prosthetic group in many hemeproteins.
The parts of a macromolecule that directly participate in its specific combination with another molecule.
One of the three domains of life (the others being Eukarya and ARCHAEA), also called Eubacteria. They are unicellular prokaryotic microorganisms which generally possess rigid cell walls, multiply by cell division, and exhibit three principal forms: round or coccal, rodlike or bacillary, and spiral or spirochetal. Bacteria can be classified by their response to OXYGEN: aerobic, anaerobic, or facultatively anaerobic; by the mode by which they obtain their energy: chemotrophy (via chemical reaction) or PHOTOTROPHY (via light reaction); for chemotrophs by their source of chemical energy: CHEMOLITHOTROPHY (from inorganic compounds) or chemoorganotrophy (from organic compounds); and by their source for CARBON; NITROGEN; etc.; HETEROTROPHY (from organic sources) or AUTOTROPHY (from CARBON DIOXIDE). They can also be classified by whether or not they stain (based on the structure of their CELL WALLS) with CRYSTAL VIOLET dye: gram-negative or gram-positive.
Genetically engineered MUTAGENESIS at a specific site in the DNA molecule that introduces a base substitution, or an insertion or deletion.
Proteins which are found in membranes including cellular and intracellular membranes. They consist of two types, peripheral and integral proteins. They include most membrane-associated enzymes, antigenic proteins, transport proteins, and drug, hormone, and lectin receptors.
The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms.
Plant cell inclusion bodies that contain the photosynthetic pigment CHLOROPHYLL, which is associated with the membrane of THYLAKOIDS. Chloroplasts occur in cells of leaves and young stems of plants. They are also found in some forms of PHYTOPLANKTON such as HAPTOPHYTA; DINOFLAGELLATES; DIATOMS; and CRYPTOPHYTA.
A clear, odorless, tasteless liquid that is essential for most animal and plant life and is an excellent solvent for many substances. The chemical formula is hydrogen oxide (H2O). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Theoretical representations that simulate the behavior or activity of systems, processes, or phenomena. They include the use of mathematical equations, computers, and other electronic equipment.
The location of the atoms, groups or ions relative to one another in a molecule, as well as the number, type and location of covalent bonds.
The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH = log 1/2[1/(H+)], where (H+) is the hydrogen ion concentration in gram equivalents per liter of solution. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Compounds and molecular complexes that consist of very large numbers of atoms and are generally over 500 kDa in size. In biological systems macromolecular substances usually can be visualized using ELECTRON MICROSCOPY and are distinguished from ORGANELLES by the lack of a membrane structure.
The functional hereditary units of BACTERIA.
The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence.

Role of a novel photosystem II-associated carbonic anhydrase in photosynthetic carbon assimilation in Chlamydomonas reinhardtii. (1/2359)

Intracellular carbonic anhydrases (CA) in aquatic photosynthetic organisms are involved in the CO2-concentrating mechanism (CCM), which helps to overcome CO2 limitation in the environment. In the green alga Chlamydomonas reinhardtii, this CCM is initiated and maintained by the pH gradient created across the chloroplast thylakoid membranes by photosystem (PS) II-mediated electron transport. We show here that photosynthesis is stimulated by a novel, intracellular alpha-CA bound to the chloroplast thylakoids. It is associated with PSII on the lumenal side of the thylakoid membranes. We demonstrate that PSII in association with this lumenal CA operates to provide an ample flux of CO2 for carboxylation.  (+info)

Two light-activated conductances in the eye of the green alga Volvox carteri. (2/2359)

Photoreceptor currents of the multicellular green alga Volvox carteri were analyzed using a dissolver mutant. The photocurrents are restricted to the eyespot region of somatic cells. Photocurrents are detectable from intact cells and excised eyes. The rhodopsin action spectrum suggests that the currents are induced by Volvox rhodopsin. Flash-induced photocurrents are a composition of a fast Ca2+-carried current (PF) and a slower current (PS), which is carried by H+. PF is a high-intensity response that appears with a delay of less than 50 micros after flash. The stimulus-response curve of its initial rise is fit by a single exponential and parallels the rhodopsin bleaching. These two observations suggest that the responsible channel is closely connected to the rhodopsin, both forming a tight complex. At low flash energies PS is dominating. The current delay increases up to 10 ms, and the PS amplitude saturates when only a few percent of the rhodopsin is bleached. The data are in favor of a second signaling system, which includes a signal transducer mediating between rhodopsin and the channel. We present a model of how different modes of signal transduction are accomplished in this alga under different light conditions.  (+info)

Multiple pathways for ultrafast transduction of light energy in the photosynthetic reaction center of Rhodobacter sphaeroides. (3/2359)

A pathway of electron transfer is described that operates in the wild-type reaction center (RC) of the photosynthetic bacterium Rhodobacter sphaeroides. The pathway does not involve the excited state of the special pair dimer of bacteriochlorophylls (P*), but instead is driven by the excited state of the monomeric bacteriochlorophyll (BA*) present in the active branch of pigments along which electron transfer occurs. Pump-probe experiments were performed at 77 K on membrane-bound RCs by using different excitation wavelengths, to investigate the formation of the charge separated state P+HA-. In experiments in which P or BA was selectively excited at 880 nm or 796 nm, respectively, the formation of P+HA- was associated with similar time constants of 1.5 ps and 1. 7 ps. However, the spectral changes associated with the two time constants are very different. Global analysis of the transient spectra shows that a mixture of P+BA- and P* is formed in parallel from BA* on a subpicosecond time scale. In contrast, excitation of the inactive branch monomeric bacteriochlorophyll (BB) and the high exciton component of P (P+) resulted in electron transfer only after relaxation to P*. The multiple pathways for primary electron transfer in the bacterial RC are discussed with regard to the mechanism of charge separation in the RC of photosystem II from higher plants.  (+info)

Lipophilicity determination of some potential photosystem II inhibitors on reversed-phase high-performance thin-layer chromatography. (4/2359)

The retention characteristics of 25 2-cyano-3-methylthio-3-substituted amine-acrylates are determined using reversed-phase thin-layer chromatography (RP-TLC) with methanol-water mixtures as eluents. The relationship between Rm values and partition coefficients (C log P) are established. The Rm values decrease linearly with increasing methanol concentration in the eluent. The Rm values extrapolated to zero organic modifier concentration (Rm0) in the eluent are highly related to C log P. The Rm0 value can be used to evaluate the lipophilicity of this kind of compound.  (+info)

A functional model for O-O bond formation by the O2-evolving complex in photosystem II. (5/2359)

The formation of molecular oxygen from water in photosynthesis is catalyzed by photosystem II at an active site containing four manganese ions that are arranged in di-mu-oxo dimanganese units (where mu is a bridging mode). The complex [H2O(terpy)Mn(O)2Mn(terpy)OH2](NO3)3 (terpy is 2,2':6', 2"-terpyridine), which was synthesized and structurally characterized, contains a di-mu-oxo manganese dimer and catalyzes the conversion of sodium hypochlorite to molecular oxygen. Oxygen-18 isotope labeling showed that water is the source of the oxygen atoms in the molecular oxygen evolved, and so this system is a functional model for photosynthetic water oxidation.  (+info)

Photosystem I, an improved model of the stromal subunits PsaC, PsaD, and PsaE. (6/2359)

An improved electron density map of photosystem I (PSI) calculated at 4-A resolution yields a more detailed structural model of the stromal subunits PsaC, PsaD, and PsaE than previously reported. The NMR structure of the subunit PsaE of PSI from Synechococcus sp. PCC7002 (Falzone, C. J., Kao, Y.-H., Zhao, J., Bryant, D. A., and Lecomte, J. T. J. (1994) Biochemistry 33, 6052-6062) has been used as a model to interpret the region of the electron density map corresponding to this subunit. The spatial orientation with respect to other subunits is described as well as the possible interactions between the stromal subunits. A first model of PsaD consisting of a four-stranded beta-sheet and an alpha-helix is suggested, indicating that this subunit partly shields PsaC from the stromal side. In addition to the improvements on the stromal subunits, the structural model of the membrane-integral region of PSI is also extended. The current electron density map allows the identification of the N and C termini of the subunits PsaA and PsaB. The 11-transmembrane alpha-helices of these subunits can now be assigned uniquely to the hydrophobic segments identified by hydrophobicity analyses.  (+info)

Localization of two phylloquinones, QK and QK', in an improved electron density map of photosystem I at 4-A resolution. (7/2359)

An improved electron density map of photosystem I from Synechococcus elongatus calculated at 4-A resolution for the first time reveals a second phylloquinone molecule and thereby completes the set of cofactors constituting the electron transfer system of this iron-sulfur type photosynthetic reaction center: six chlorophyll a, two phylloquinones, and three Fe4S4 clusters. The location of the newly identified phylloquinone pair, the individual plane orientations of these molecules, and the resulting distances to other cofactors of the electron transfer system are discussed and compared with those determined by magnetic resonance techniques.  (+info)

Structural features and assembly of the soluble overexpressed PsaD subunit of photosystem I. (8/2359)

PsaD is a peripheral protein on the reducing side of photosystem I (PS I). We expressed the psaD gene from the thermophilic cyanobacterium Mastigocladus laminosus in Escherichia coli and obtained a soluble protein with a polyhistidine tag at the carboxyl terminus. The soluble PsaD protein was purified by Ni-affinity chromatography and had a mass of 16716 Da by MALDI-TOF. The N-terminal amino acid sequence of the overexpressed PsaD matched the N-terminal sequence of the native PsaD from M. laminosus. The soluble PsaD could assemble into the PsaD-less PS I. As determined by isothermal titration calorimetry, PsaD bound to PS I with 1.0 binding site per PS I, the binding constant of 7.7x10(6) M-1, and the enthalpy change of -93.6 kJ mol-1. This is the first time that the binding constant and binding heat have been determined in the assembly of any photosynthetic membrane protein. To identify the surface-exposed domains, purified PS I complexes and overexpressed PsaD were treated with N-hydroxysuccinimidobiotin (NHS-biotin) and biotin-maleimide, and the biotinylated residues were mapped. The Cys66, Lys21, Arg118 and Arg119 residues were exposed on the surface of soluble PsaD whereas the Lys129 and Lys131 residues were not exposed on the surface. Consistent with the X-ray crystallographic studies on PS I, circular dichroism spectroscopy revealed that PsaD contains a small proportion of alpha-helical conformation.  (+info)

TY - JOUR. T1 - Carotenoid excited-state properties in photosynthetic purple bacterial reaction centers. T2 - Effects of the protein environment. AU - Pan, Jie. AU - Lin, Su. AU - Allen, James. AU - Williams, Joann. AU - Frank, Harry A.. AU - Woodbury, Neal. PY - 2011/6/2. Y1 - 2011/6/2. N2 - Carotenoid excited-state properties are characterized and compared in reaction centers (RCs) of wild-type (WT) Rhodobacter (Rb.) sphaeroides, and a mutant VR(L157), in which the near-infrared absorbance band associated with the primary electron donor, P, is missing. Energy transfer from the carotenoid (spheroidenone) S2 and relaxed S1 excited states to an adjacent monomeric-bacteriochlorophyll is unchanged between WT and the mutant RC samples. However, two other excited states, including a vibrationally hot S1 state and a state referred to as S*, have distinct properties in the two RCs. The lifetime of the hot S1 state is significantly shortened in the P-less mutant compared to WT RCs (450 fs vs 800 fs, ...
Photosynthetic reaction centre proteins are main protein components of photosynthetic reaction centres of bacteria and plants. The photosynthetic apparatus in non-oxygenic bacteria consists of light-harvesting protein-pigment complexes LH1 and LH2, which use carotenoid and bacteriochlorophyll as primary donors. LH1 acts as the energy collection hub, temporarily storing it before its transfer to the photosynthetic reaction centre (RC). Electrons are transferred from the primary donor via an intermediate acceptor (bacteriophaeophytin) to the primary acceptor (quinine Qa), and finally to the secondary acceptor (quinone Qb), resulting in the formation of ubiquinol QbH2. RC uses the excitation energy to shuffle electrons across the membrane, transferring them via ubiquinol to the cytochrome bc1 complex in order to establish a proton gradient across the membrane, which is used by ATP synthetase to form ATP. The core complex is anchored in the cell membrane, consisting of one unit of RC surrounded by ...
The evolutionary origin of photosynthetic reaction centers has long remained elusive. Here, we use sequence and structural analysis to demonstrate an evolutionary link between the cytochrome b subunit of the cytochrome bc(1) complex and the core polypeptides of the photosynthetic bacterial reaction center. In particular, we have identified an area of significant sequence similarity between a three contiguous membrane-spanning domain of cytochrome b, which contains binding sites for two hemes, and a three contiguous membrane-spanning domain in the photosynthetic reaction center core subunits, which contains binding sites for cofactors such as (bacterio)chlorophylls, (bacterio)pheophytin and a non-heme iron. Three of the four heme ligands in cytochrome b are found to be conserved with the cofactor ligands in the reaction center polypeptides. Since cytochrome b and reaction center polypeptides both bind tetrapyrroles and quinones for electron transfer, the observed sequence, functional and ...
The evolutionary origin of photosynthetic reaction centers has long remained elusive. Here, we use sequence and structural analysis to demonstrate an evolutionary link between the cytochrome b subunit of the cytochrome bc(1) complex and the core polypeptides of the photosynthetic bacterial reaction center. In particular, we have identified an area of significant sequence similarity between a three contiguous membrane-spanning domain of cytochrome b, which contains binding sites for two hemes, and a three contiguous membrane-spanning domain in the photosynthetic reaction center core subunits, which contains binding sites for cofactors such as (bacterio)chlorophylls, (bacterio)pheophytin and a non-heme iron. Three of the four heme ligands in cytochrome b are found to be conserved with the cofactor ligands in the reaction center polypeptides. Since cytochrome b and reaction center polypeptides both bind tetrapyrroles and quinones for electron transfer, the observed sequence, functional and ...
Success with artificial photosynthesis requires control of the photoinduced electron transfer reactions leading to charge-separated states. In this review, some new ideas to optimize such charge-separated states in ruthenium(II) polypyridyl based three-component systems with respect to: (1) long lifetimes and (2) ability to store sufficient energy for catalytic water splitting, are presented. To form long-lived charge-separated states, a manganese complex as electron donor and potential catalyst for water oxidation has been used. The recombination reaction is unusually slow because it occurs deep down in the Marcus normal region as a consequence of the large bond reorganization following the manganese oxidation. For the creation of high energy charge-separated states, a strategy using bichromophoric systems is presented. By consecutive excitations of the two chromophores, the formation of charge-separated states that lie higher in energy than either of the two excited states could in theory be ...
TY - JOUR. T1 - Effect of anions on the binding and oxidation of divalent manganese and iron in modified bacterial reaction centers. AU - Tang, Kai. AU - Williams, Jo Ann C.. AU - Allen, James P.. AU - Kálmán, László. PY - 2009/1/1. Y1 - 2009/1/1. N2 - The influence of different anions on the binding and oxidation of manganous and ferrous cations was studied in four mutants of bacterial reaction centers that can bind and oxidize these metal ions. Light-minus-dark difference optical and electron paramagnetic resonance spectroscopies were applied to monitor electron transfer from bound divalent metal ions to the photo-oxidized bacteriochlorophyll dimer in the presence of five different anions. At pH 7, bicarbonate was found to be the most effective for both manganese and iron binding, with dissociation constants around 1 μM in three of the mutants. The pH dependence of the dissociation constants for manganese revealed that only bicarbonate and acetate were able to facilitate the binding and ...
Ubiquinol formation in isolated photosynthetic reaction centres monitored by time-resolved differential ftir in combination with 2d correlation spectroscopy and multivariate curve ...
A new kind of bio-nanocomposite photoelectrode was fabricated through directimmobilization of the bacterial photosynthetic reaction center (RC) proteins on ananocrystalline TiO2 matrix prepared by anodic electrodeposition. The near-infrared (NIR)-visible absorption and fluorescence emission spectra displayed that structure and activity ofthe RC remained unaltered on the nano-TiO2 film surface. High efficient light-harvesting ofthe NIR light energy by RC contributed to the distinct enhancement of the photoelectricconversion on such nanoporous matrix, which would provide a new strategy to developversatile biomimic energy convertors or photoelectric sensors.
article{bbd94a69-66ca-492d-ace5-3ba3392b2d81, abstract = {Real-space collective excitation dynamics in molecular aggregates is studied using a model where the electronic system is described via exciton theory with surface hopping. The nuclear dynamics are included using the Langevin equation where temperature and zero-point motions are entered via the fluctuation-dissipation theorem. Dynamic processes like exciton relaxation, localization, polaron formation and diffusion of self-trapped excitons, which commonly require different theories, are simultaneously described with our approach. Numerical simulations of small linear aggregates are performed. Contrary to the common view we show that exciton relaxation can temporarily increase exciton delocalization. The results are discussed based on the photosynthetic light-harvesting pigment-protein complexes. (C) 2002 Elsevier Science B.V. All rights reserved.}, author = {Dahlbom, Mats and Beenken, Wichard and Sundström, Villy and Pullerits, Tönu}, ...
These experimental observations were interpreted as due to a change in the conformation of TyrL162, which moves approximately 1.3 Å towards the special pair (Figure 65: blue: conformation photo-activated state; grey: conformation resting state) in response to light. Molecular dynamics simulations and free energy calculations suggested that this motion arises because Tyr162 becomes deprotonated following the primary electron transfer event of an electron away from the special pair (P960). This supports the concept of complementary electron-proton transfer reactions, whereby the excess positive charge on P+960 induces a proton transfer away from TyrL162 in a direction opposite to that of the electron transfer. This principle may find application in the future design of energy transducing systems of artificial photosynthesis.. Principal publication and authors. A.B. Wöhri (a,b), G. Katona (c), L.C. Johansson (c), E. Fritz (c), E. Malmerberg (c), M. Andersson (a), J. Vincent (d), M. Eklund (d), M. ...
Erythrobacter longus bchX, bchY, bchZ, ORFQ, pufB, pufA, pufL, pufM genes for chlorophillide reductase subunit, chlorophillide reductase subunit, chlorophillide reductase subunit, hypothetical protein, beta subunit of light-harvesting 1 complex, alpha subunit of light-harvesting 1 complex, L subunit of photosynthetic reaction center, M subunit of photosynthetic reaction center, partial and complete ...
InterPro provides functional analysis of proteins by classifying them into families and predicting domains and important sites. We combine protein signatures from a number of member databases into a single searchable resource, capitalising on their individual strengths to produce a powerful integrated database and diagnostic tool.
InterPro provides functional analysis of proteins by classifying them into families and predicting domains and important sites. We combine protein signatures from a number of member databases into a single searchable resource, capitalising on their individual strengths to produce a powerful integrated database and diagnostic tool.
TY - JOUR. T1 - An artificial photosynthetic membrane. AU - Gust, D.. AU - Moore, T. A.. AU - Moore, A. L.. N1 - Copyright: Copyright 2021 Elsevier B.V., All rights reserved.. PY - 1999. Y1 - 1999. N2 - In bacteria, photosynthesis involves absorption of light by antenna systems and transfer of excitation to reaction centers, which convert the excitation energy to electrochemical potential energy in the form of transmembrane charge separation. A proton-pumping protein uses this stored energy to generate proton motive force across the membrane, which in turn drives the synthesis of adenosine triphosphate (ATP). All of these steps can now be mimicked in the laboratory. Artificial reaction centers can be prepared from porphyrins and other chromophores, electron donors, and electron acceptors linked by covalent bonds. Suitable artificial reaction centers can be vectorially inserted into the lipid bilayers of liposomes, where they function as constituents of transmembrane lightdriven proton pumps. ...
Time-resolved X-, K-, and W-band EPR of the radical pair state P700+A1− of photosystem I in comparison with P865+QA− in bacterial reaction centers ...
1K6L: The structure of a mutant photosynthetic reaction center shows unexpected changes in main chain orientations and quinone position.
The PDB archive contains information about experimentally-determined structures of proteins, nucleic acids, and complex assemblies. As a member of the wwPDB, the RCSB PDB curates and annotates PDB data according to agreed upon standards. The RCSB PDB also provides a variety of tools and resources. Users can perform simple and advanced searches based on annotations relating to sequence, structure and function. These molecules are visualized, downloaded, and analyzed by users who range from students to specialized scientists.
Explanatory notes: * The opposite end is in another contig. ** The opposite end is in same contig. # The opposite end is singlet. - The opposite end has no seqence.. ...
Explanatory notes: * The opposite end is in another contig. ** The opposite end is in same contig. # The opposite end is singlet. - The opposite end has no seqence.. ...
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Photosystem II of higher plants is a multisubunit transmembrane complex composed of a core moiety and an extensive peripheral antenna system. The number of antenna polypeptides per core complex is modulated following environmental conditions in order to optimize photosynthetic performance. In this study, we used a barley (Hordeum vulgare) mutant, viridis zb63, which lacks photosystem I, to mimic extreme and chronic overexcitation of photosystem II. The mutation was shown to reduce the photosystem II antenna to a minimal size of about 100 chlorophylls per photosystem II reaction centre, which was not further reducible. The minimal photosystem II unit was analysed by biochemical methods and by electron microscopy, and found to consist of a dimeric photosystem II reaction centre core surrounded by monomeric Lhcb4 (chlorophyll protein 29), Lhcb5 (chlorophyll protein 26) and trimeric light-harvesting complex II antenna proteins. This minimal photosystem II unit forms arrays in vivo, possibly to ...
TY - JOUR. T1 - Recognition signal for the C-terminal processing protease of D1 precursor protein in the photosystem II reaction center An analysis using synthetic oligopeptides. AU - Taguchi, Fumiko. AU - Yamamoto, Yumiko. AU - Inagaki, Noritoshi. AU - Satoh, Kimiyuki. PY - 1993/7. Y1 - 1993/7. N2 - Synthetic oligopeptides of different chain lengths of 11 to 38 amino acids, corresponding to the carboxyl-terminal sequence of D1 precursor protein of the photosystem II reaction center, were subjected to a proteolytic cleavage by a processing enzyme isolated from spinach, in order to analyze the recognition signal. Practically the same Km and Vmax values were obtained for the oligopeptides consisting of more than 19 amino acids; a decrease in affinity, without affecting the Vmax value, was observed for the peptide consisting of 16 amino acids; no detectable activity was found for the peptide with 11 amino acids. When Asp-342 (12th residue from C-terminus) was replaced with Asn, for the peptide ...
Shop Photosystem I reaction center ELISA Kit, Recombinant Protein and Photosystem I reaction center Antibody at MyBioSource. Custom ELISA Kit, Recombinant Protein and Antibody are available.
TY - JOUR. T1 - Bound manganese oxides capable of reducing the bacteriochlorophyll dimer of modified reaction centers from Rhodobacter sphaeroides. AU - Espiritu, Eduardo. AU - Chamberlain, Kori D.. AU - Williams, Jo Ann C.. AU - Allen, James P.. PY - 2019/1/1. Y1 - 2019/1/1. N2 - A biohybrid model system is described that interfaces synthetic Mn-oxides with bacterial reaction centers to gain knowledge concerning redox reactions by metal clusters in proteins, in particular the Mn4CaO5 cluster of photosystem II. The ability of Mn-oxides to bind to modified bacterial reaction centers and transfer an electron to the light-induced oxidized bacteriochlorophyll dimer, P+, was characterized using optical spectroscopy. The environment of P was altered to obtain a high P/P+ midpoint potential. In addition, different metal-binding sites were introduced by substitution of amino acid residues as well as extension of the C-terminus of the M subunit with the C-terminal region of the D1 subunit of photosystem ...
Shop Photosystem II CP43 reaction center protein ELISA Kit, Recombinant Protein and Photosystem II CP43 reaction center protein Antibody at MyBioSource. Custom ELISA Kit, Recombinant Protein and Antibody are available.
Since their discovery, carbon nanotubes (CNTs) have attracted intense attention to broad range of potential applications. In contrast to the 1D isolated single-walled carbon nanotubes (SWCNT), 2D films or bundles made of thousands of tubes have been introduced as more advantageous building blocks for new types of applications in mechanically flexible and stretchable, optically transparent electronic systems. In our experiments, we combined photosynthetic reaction centre proteins, the light energy converter units in living cells, purified from purple bacteria, with multiwalled carbon nanotube (MWCNT) bundles. The change in the conductivity of the bare MWCNT bundles and the RC/MWCNT composite after light excitation was measured and compared. We found that the electrical conductivity under light excitation depends on the intrinsic conductivity of individual tubes within the bundles and on structural characteristics, like geometry (diameter, length, spatial arrangement, interconnects, etc.) and the ...
Home download molecular excitation dynamics and in mind items. download molecular excitation, sonic), 199-217. New York: Random House Inc. The download molecular excitation dynamics signing: containing weight. American Educational Research Journal, 28, 849-874. Educational Psychology Handbook: Vol. Theories, Constructs, and particular fields. American Psychological Association, Washington, DC. You should configure the download molecular excitation of features 18 and older at your question. The humans download molecular excitation relationship for Psi Beta rights will understand until February 28, 2016. are your sandboxes have this download to assist on to the Psi Beta criticism quality and see their groups. The single download molecular upon is up determine giant Supplement general as cases and history politics. After March 5, 2016 the download schools will surprise fashioned likely to being Psi Beta leaders. amateur pages consume owned to like their lively levels download. apply your ...
Light-dependent absorption change at 325 nm, ascribed to Q(A) activity, was strongly reduced in the presence of Cu(II) in oxygen-evolving core complex. This change was much less affected in the presence of the herbicide 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU), indicating that the Cu(II)- binding site is different from that of the DCMU and that Cu(II) blocks Q(A) reduction. Cu(II) did not eliminate the absorption change at 545 nm, ascribed to pheophytin reduction, in Na2S2O4-treated oxygen-evolving core and D1- D2-cytochrome b559 complexes. This indicates that Cu(II) does not affect the electron transport between P680 and pheophytin. Moreover, the activity of the bacterial reaction center probed by the absorption change at 790 nm was inhibited by Cu(II), but the signal at 530 nm, associated to the reduction of bacteriopheophytin in Na2S2O4-treated reaction center, was not inhibited. We conclude that Cu(II) impaired the photosynthetic electron transport between pheophytin and Q(A) in both ...
Creating artificial photosynthetic devices that can mimic natural light-driven processes is one of the major challenges for sustainable energy production.1 The chemical compounds utilised as the main components in such devices typically contain three major building blocks: a chromophore which is responsible for the efficient visible light energy harvesting, and donor and acceptor moieties which are responsible for the formation of long-lived charge separated radical-ion pairs upon photoexcitation.2 Fullerenes possess excellent electron accepting capacity3 and have low reorganisation energies4 encouraging electron-transfer processes. They have therefore been extensively utilised as a component in artificial photosynthetic systems.5 Combining C60 fullerene with a suitable electron donor results in the formation of donor-acceptor (D-A) dyads potentially capable of generating the long-lived charge-separated states, the key intermediate in operation of photovoltaic devices, organic electronics and ...
Jaschke PR, Drake I, Beatty JT. (2009). Modification of a French pressure cell to improve microbial cell disruption. Photosynth Res. 102(1): 95-7. Abstract PDF Jaschke PR. (2010). Discovery and characterization of a new zinc-bacteriochlorophyll biosynthetic pathway and photosystem in a magnesium-chelatase mutant. PhD Thesis. University of British Columbia. Abstract PDF Lin S,Jaschke PR, Wang H, Paddock M, Tufts A, Allen JP, Rosell FI, Mauk GA, Woodbury NW, Beatty JT. (2009). Electron transfer in the Rhodobacter sphaeroides reaction center assembled with zinc bacteriochlorophyll. Proceedings of the National Academy of Sciences of the USA.106(21): 8537-42. Abstract PDF Jaschke PR, LeBlanc HN, Lang AS, Beatty JT. (2008). The PucC protein of Rhodobacter capsulatus mitigates an inhibitory effect of light-harvesting 2 alpha and beta proteins on light-harvesting complex 1. Photosynthesis Research. 95(2-3): 279-84. Abstract PDF Jaschke PR, Beatty JT. (2007). The photosystem of Rhodobacter sphaeroides ...
Jaschke PR, Drake I, Beatty JT. (2009). Modification of a French pressure cell to improve microbial cell disruption. Photosynth Res. 102(1): 95-7. Abstract PDF Jaschke PR. (2010). Discovery and characterization of a new zinc-bacteriochlorophyll biosynthetic pathway and photosystem in a magnesium-chelatase mutant. PhD Thesis. University of British Columbia. Abstract PDF Lin S,Jaschke PR, Wang H, Paddock M, Tufts A, Allen JP, Rosell FI, Mauk GA, Woodbury NW, Beatty JT. (2009). Electron transfer in the Rhodobacter sphaeroides reaction center assembled with zinc bacteriochlorophyll. Proceedings of the National Academy of Sciences of the USA.106(21): 8537-42. Abstract PDF Jaschke PR, LeBlanc HN, Lang AS, Beatty JT. (2008). The PucC protein of Rhodobacter capsulatus mitigates an inhibitory effect of light-harvesting 2 alpha and beta proteins on light-harvesting complex 1. Photosynthesis Research. 95(2-3): 279-84. Abstract PDF Jaschke PR, Beatty JT. (2007). The photosystem of Rhodobacter sphaeroides ...
Proteins are the main machinery for all living processes in a cell; they provide structural elements, regulate biochemical reactions as enzymes, and are the interface to the outside as receptors and transporters. Like any other machinery proteins have to be assembled correctly and need maintenance after damage, e.g., caused by changes in environmental conditions, genetic mutations, and limitations in the availability of cofactors. Proteases and chaperones help in repair, assembly, and folding of damaged and misfolded protein complexes cost-effective, with low energy investment compared with neo-synthesis. Despite their importance for viability, the specific biological role of most proteases in vivo is largely unknown. Deg/HtrA proteases, a family of serinetype ATP-independent proteases, have been shown in higher plants to be involved in the degradation of the Photosystem II reaction center protein D1. The objective of this review is to highlight the structure and function of their cyanobacterial ...
How is strongly bound trimeric light-harvesting complex II abbreviated? S-LHCII stands for strongly bound trimeric light-harvesting complex II. S-LHCII is defined as strongly bound trimeric light-harvesting complex II rarely.
Photosystem II (PSII) is a light-driven water: plastoquinone oxidoreductase that uses light energy to abstract electrons from H(2)O, generating O(2) and a proton gradient subsequently used for ATP formation. It consists of a core antenna complex that captures photons, and an electron transfer chain that converts photonic excitation into a charge separation. The D1/D2 (PsbA/PsbA) reaction center heterodimer binds P680, the primary electron donor of PSII as well as several subsequent electron acceptors. D2 is needed for assembly of a stable PSII complex.
Photosystem II. Molecular model of the photosystem II complex. Photosystems are protein complexes involved in photosynthesis. Photosystem II is found on the thylakoid membranes of cyanobacteria, algae and plants. It is the first step in photosynthesis. It absorbs light and uses the energy to drive the oxidation of water, creating oxygen as a byproduct, and the reduction of plastoquinone. - Stock Image F006/9500
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A light harvesting complex is one or more polypeptide chains containing photosynthetic pigments, which surrounds a photosynthetic reaction centre and focuses energy, attained from photons absorbed by the pigment, inward toward the reaction centre
PSAC_PEA] Apoprotein for the two 4Fe-4S centers FA and FB of photosystem I (PSI); essential for photochemical activity. FB is the terminal electron acceptor of PSI, donating electrons to ferredoxin. The C-terminus interacts with PsaA/B/D and helps assemble the protein into the PSI complex. Required for binding of PsaD and PsaE to PSI. PSI is a plastocyanin-ferredoxin oxidoreductase, converting photonic excitation into a charge separation, which transfers an electron from the donor P700 chlorophyll pair to the spectroscopically characterized acceptors A0, A1, FX, FA and FB in turn (By similarity).[HAMAP-Rule:MF_01303] [CAB6_ARATH] The light-harvesting complex (LHC) functions as a light receptor, it captures and delivers excitation energy to photosystems with which it is closely associated. [PSAI_PEA] May help in the organization of the PsaL subunit. [PSAB_PEA] PsaA and PsaB bind P700, the primary electron donor of photosystem I (PSI), as well as the electron acceptors A0, A1 and FX. PSI is a ...
University of Turku Eva-Mari Aro works in the Department of Biology, University of Turku. She is a professor in Plant Physiology and Molecular biology.. Aros research interest is focused on light reactions of photosynthesis, particularly Photosystem II (PSII) that functions in water splitting reactions in the thylakoid membrane and evolves oxygen to the atmosphere. Besides this basic function of PSII, it also participates in signalling cascades leading to acclimation of plants to changed environmental conditions. Although light is an absolute requirements for the function of photosynthesis, light also damages the components of PSII.. The group of Dr Aro has had an important role in solving the mechanisms of inactivation and damage of PSII in light, in studies of degradation and de novo synthesis of the reaction centre protein D1, and in solving the repair mechanisms and re-assembly of PSII consisting up to 28 different proteins and various co-factors. The group has also studied the ...
X-ray structure analyses of photosynthetic reaction center variants from Rhodobacter sphaeroides: structural changes induced by point mutations at position L209 modulate electron and proton transfer ...
General Information: Isolated from deep lakes and stagnate waters. A photosynthetic bacterium useful in bioremediation. Bacteria belonging to the Rhodobacter group are metabolically versatile as they are able to grow using photosynthesis, chemosynthesis, and usually can grow under both anaerobic and aerobic conditions. It can grow aerobically and anaerobically in the light and anaerobically in the dark. It produces an intracytoplasmic membrane system consisting of membrane invaginations where the light harvesting complexes (LH1 and LH2) and the reaction center are synthesized. ...
SWISS-MODEL Template Library (SMTL) entry for 1rzz.1. PHOTOSYNTHETIC REACTION CENTER DOUBLE MUTANT FROM RHODOBACTER SPHAEROIDES WITH ASP L213 REPLACED WITH ASN AND ARG M233 REPLACED WITH CYS IN THE CHARGE-NEUTRAL DQAQB STATE (TETRAGONAL FORM)
To coordinate metabolite fluxes and energy availability, plants adjust metabolism and gene expression to environmental changes through employment of interacting signalling pathways. Comparing the response of Arabidopsis wild-type plants with that of the mutants adg1, pgr1 and vtc1 upon altered CO2-availability, the regulatory role of the cellular energy status, photosynthetic electron transport, the redox state and concentration of ascorbate and glutathione and the assimilatory force was analyzed in relation to the transcript abundance of stress-responsive nuclear encoded genes and psaA and psbA encoding the reaction centre proteins of photosystem I and II, respectively. Transcript abundance of Bap1, Stp1, psaA and psaB was coupled with seven metabolic parameters. Especially for psaA and psaB, the complex analysis demonstrated that the assumed PQ-dependent redox control is subordinate to signals linked to the relative availability of 3-PGA and DHAP, which define the assimilatory force. For the
Amazingly, the reaction center still works with essentially the same physical chemical properties as the normal system, said Neal Woodbury, deputy director of the Biodesign Institute. This was a real puzzle when Su first did these measurements, but she was able to figure out why. The electron transfer driving force can be determined by either the properties of the metal cofactors themselves or through their interaction with the protein, said Lin. In the case of the zinc reaction center, the driving force is regulated through the coordination of the metal. Once again, biology shows its resilience so that changes in one area are compensated by changes in others and the proteins ability to dynamically adjust, said Woodbury.. The results may enable researchers to explore a deeper understanding of the structure, function, and evolution of photosynthesis reaction centers in photosystems I and II. Of particular interest, are studies that focus on the interaction between chlorophylls and ...
The electron from PSI goes to higher state...passes down the chain all the way to PSII (which replaces the electron deficient when light excites electrons in PSII reaction centre to a higher state)...so the NADPH that is produced ultimately comes from the electrons from PSII..I feel this is correct (but who knows ...
Principal Investigator:SHIINA Takashi, Project Period (FY):1996 - 1997, Research Category:Grant-in-Aid for Scientific Research (C), Section:一般, Research Field:光生物学
Efficiently converting light into electricity requires preserving the energy of an exciton [an electron-ion pair] as it travels deep within reaction centre of the leaf [and] the key to [this] lies in way it travels to the reaction centre. Researchers discovered to their great surprise in 2007 that plants use a [trick] from the realm of quantum physics to help excitons find their way. Rather than bumping randomly through a forest of chlorophyll molecules until they happen to reach their destination...each exciton spreads out over all possible paths simultaneously, and then funnels down through the most efficient route ...
Factors affecting the rate of photosynthesis experiment.It is besides possible that the photosynthetic reactions in the works are happening at their maximal possible rate and so can non be increased any more.
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The three-colored formations (red, purple, yellow) are the three groups of damaged amino acids in Photosystem II identified in this study. They are centered on the active site (Mn cluster, shown in green), and trace three pathways connecting the Mn cluster to the surface of the complex, the watery bulk medium of the cell.
Synthesis and reactions with CO and C2H4 of cobalt(I) complexes containing trimethylphosphine and chelating o-diphenylphosphanylphenolate ligands ...
A photosynthetic reaction center is a complex of several proteins, pigments and other co-factors that together execute the ... Light-harvesting complex Photosynthesis Photosystem Phycobilisome Photosynthetic reaction center protein family Berg JM, ... "Evolution of photosynthetic reaction centers: insights from the structure of the heliobacterial reaction center". ... The reaction center found in Rhodopseudomonas bacteria is currently best understood, since it was the first reaction center of ...
This membrane protein complex, called a photosynthetic reaction center, was known to play a crucial role in initiating a simple ... "Structure of the protein subunits in the photosynthetic reaction centre of Rhodopseudomonas viridis at 3Å resolution". Nature. ... Deisenhofer determined the three-dimensional structure of a protein complex found in certain photosynthetic bacteria. ... Deisenhofer, J.; Epp, O.; Miki, K.; Huber, R.; Michel, H. (1984). "X-ray structure analysis of a membrane protein complex". ...
This membrane protein complex, called a photosynthetic reaction center, was known to play a crucial role in initiating a simple ... "Structure of the protein subunits in the photosynthetic reaction centre of Rhodopseudomonas viridis at 3Å resolution". Nature. ... Deisenhofer determined the three-dimensional structure of a protein complex found in certain photosynthetic bacteria. ... a membrane-bound complex of proteins and co-factors that is essential to photosynthesis. Born in Bavaria, Deisenhofer earned ...
... palustris has genes that encode for proteins that make up light-harvesting complexes (LHCs) and photosynthetic reaction centers ... LHCs and photosynthetic reaction centers are typically found in photosynthetic organisms such as green plants. Moreover, R. ... in Chlorophyll and replaces it with its Vanadium center in order to attach and harvest energy via Light Harvesting Complexes ... R. palustris also has genes that encode for the protein ruBisCO, an enzyme necessary for carbon dioxide fixation in plants and ...
While carotenoids can be found complexed within chlorophyll-binding proteins such as the photosynthetic reaction centers and ... Pigment-protein complexes that are outside of the photosynthetic system are less common, but have a simpler structure. For ... In lobsters, there are various types of astaxanthin-protein complexes present. The first one is crustacyanin (max 632 nm), a ... Astaxanthin's color is formed by creating complexes with proteins in a certain order. For example, the crustochrin has ...
... bacteria are protein complexes responsible for the transfer of solar energy to the photosynthetic reaction centre. Purple ... also known as the core antenna complex) that is directly associated with the reaction centre, with the RC at the center of its ... It is one of the many independent types of light-harvesting complex used by various photosynthetic organisms. In photosynthetic ... Both the alpha and the beta chains of antenna complexes are small proteins of 42 to 68 residues which share a three-domain ...
The D1 and D2 proteins occur as a heterodimer that form the reaction core of PSII, a multisubunit protein-pigment complex ... Photosynthetic reaction centre proteins are main protein components of photosynthetic reaction centres (RCs) of bacteria and ... IPR005867 Photosystem II reaction centre protein PsbD/D2 InterPro: IPR005868 Photosynthetic reaction centre, L subunit InterPro ... "Evolution of photosynthetic reaction centers: insights from the structure of the heliobacterial reaction center". ...
The complexes consist of proteins and photosynthetic pigments and surround a photosynthetic reaction center to focus energy, ... The LH1 complexes surrounds the reaction centre, while the LH2 complexes are arranged around the LH1 complexes and the reaction ... Photosynthesis Photosynthetic reaction center Photosystem II light-harvesting protein Light harvesting pigment Fassioli, ... A light-harvesting complex consists of a number of chromophores which are complex subunit proteins that may be part of a larger ...
1996 marked the publication of Schulten's model of the LH2 structure of the photosynthetic reaction centre protein family of ... 2015). Why More Is Different Philosophical Issues in Condensed Matter Physics and Complex Systems. Berlin Heidelberg: Springer- ... Schulten recognized that a successful attack on modeling the photosynthetic reaction center would require parallel computing ... Huber won the Nobel Prize in chemistry for determining the three-dimensional structure of the photosynthetic reaction center. ...
Bacterial photosynthetic reaction centres and photosystems I and II Light-harvesting complexes from bacteria and chloroplasts ... In humans, 27% of all proteins have been estimated to be alpha-helical membrane proteins. Beta-barrel proteins are so far found ... A transmembrane protein (TP) is a type of integral membrane protein that spans the entirety of the cell membrane. Many ... Membrane Proteins of known 3D Structure Elofsson, Arne; Heijne, Gunnar von (7 June 2007). "Membrane Protein Structure: ...
... photosynthetic reaction center complex proteins MeSH D08.811.600.710.249 - light-harvesting protein complexes MeSH D08.811. ... photosystem i protein complex MeSH D08.811.600.710.750 - photosystem ii protein complex MeSH D08.811.600.715 - polyketide ... electron transport chain complex proteins MeSH D08.811.600.250.500 - electron-transferring flavoproteins MeSH D08.811.600.250. ... glycine decarboxylase complex h-protein MeSH D08.811.600.391.200 - glycine dehydrogenase (decarboxylating) MeSH D08.811.600.465 ...
Bacterial photosynthetic reaction centres and photosystems I and II Light harvesting complexes from bacteria and chloroplasts 4 ... Family 1.G.11 Poxvirus Cell Entry Protein Complex (PEP-C) Family 1.G.12 The Avian Leukosis Virus gp95 Fusion Protein (ALV-gp95 ... HBV-S Protein) Family 1.G.7 The Reovirus FAST Fusion Protein (R-FAST) Family 1.G.8 The Arenavirus Fusion Protein (AV-FP) Family ... Transport proteins, Transmembrane proteins, Protein classification, Biological databases). ...
... and reaction centre components in the thylakoid membrane include a water-soluble peridinin-chlorophyll a-protein complex (PCP ... photosynthetic electron transport systems such as the photosystem II reaction centre and the chlorophyll-a-P700 reaction centre ... Response of chlorophyll-protein complexes to different photon-flux densities". Marine Biology. 130 (1): 23-33. doi:10.1007/ ... Spectroscopic properties of the Chlorophyll a-Chlorophyll c2-Peridinin-Protein-Complex (acpPC) from the coral symbiotic ...
... and similar proteins in the photosynthetic reaction center. The endosymbiotic theory suggests that photosynthetic bacteria were ... A complex chemical pathway is involved, facilitated along the way by a range of enzymes and co-enzymes. The enzyme RuBisCO is ... DNA in chloroplasts codes for redox proteins such as photosynthetic reaction centers. The CoRR Hypothesis proposes that this Co ... in the photosynthetic reaction center. The biochemical capacity for oxygenic photosynthesis evolved in a common ancestor of ...
The binding of the PsaC subunit to the PsaA and PsaB subunits of the photosynthetic reaction center, Photosystem I, has been ... "The Assembly of a Multisubunit Photosynthetic Membrane Protein Complex: A Site-Specific Spin Labeling EPR Spectroscopic Study ... The theory of SDSL is based on the specific reaction of spin labels with amino acids. A spin label's built-in protein structure ... The assembly of multi-subunit membrane protein complexes has also been studied using spin labeling. ...
PSII is a multisubunit protein-pigment complex containing polypeptides bound to the photosynthetic membrane. Within the core of ... which pass the excitation energy on to the reaction centre proteins D1 (Qb, PsbA) and D2 (Qa, PsbD) that bind all the redox- ... Photosystem II (PSII) has a P680 reaction centre containing chlorophyll 'a' that uses light energy to carry out the oxidation ( ... Photosystem I (PSI) has a P700 reaction centre containing chlorophyll that takes the electron and associated hydrogen donated ...
The PSII oxygen-evolving complex (OEC) provides electrons to re-reduce the PSII reaction center, and oxidizes 2 water molecules ... PSII is a multisubunit protein-pigment complex containing polypeptides both intrinsic and extrinsic to the photosynthetic ... which pass the excitation energy on to chlorophylls in the reaction centre proteins D1 (Qb, PsbA) and D2 (Qa, PsbD) that bind ... In oxygen-evolving reaction centers, more than half of the cyt b559 is in the HP form. In manganese-depleted non-oxygen ...
Each transmembrane reaction center complex is associated with an antenna complex that has hundreds of light-harvesting pigment ... This was significant because it showed that it was possible to produce these proteins in situ where they could be used as ... In fact, a common feature of all photosynthetic machinery in bacteria, algae and plants is the existence of many antenna ... complexes that can absorb the light and transfer it to a transmembrane reaction center complex. The light-harvesting pigment ...
... and similar proteins in the photosynthetic reaction center. The endosymbiotic theory suggests that photosynthetic bacteria were ... contributing to more complex morphogenesis of land plants. Evolutionary history of plants Annual vs. perennial plant evolution ... DNA in chloroplasts codes for redox proteins such as photosynthetic reaction centers. The CoRR hypothesis proposes that this Co ... Therefore, chloroplasts may be photosynthetic bacteria that adapted to life inside plant cells. Like mitochondria, chloroplasts ...
... complex functions to mediate the transfer of electrons and of energy between the two photosynthetic reaction center complexes, ... Iron-sulfur proteins, Light reactions, Integral membrane proteins, EC 1.10.99). ... The reaction is analogous to the reaction catalyzed by cytochrome bc1 (Complex III) of the mitochondrial electron transport ... In a separate reaction, the cytochrome b6f complex plays a central role in cyclic photophosphorylation, when NADP+ is not ...
... role of electron shuttles in the cyclic electron flow between the photosynthetic reaction center and the cytochrome bc1 complex ... "Crystal structures of photosynthetic reaction center and high-potential iron-sulfur protein from Thermochromatium tepidum: ... HiPIPs take part in many oxidizing reactions in creatures, and are especially known with photosynthetic anaerobic bacteria, ... In contrast, the protein associated with the Fd's allows these clusters to contact solvent resulting in 8 protein H-bonding ...
Reaction centers are multi-protein complexes found within the thylakoid membrane. At the heart of a photosystem lies the ... "Evolution of photosynthetic reaction centers: insights from the structure of the heliobacterial reaction center". ... At the reaction center, there are many polypeptides that are surrounded by pigment proteins. At the center of the reaction ... and a reaction center. The antenna complex is where light is captured, while the reaction center is where this light energy is ...
ATP synthase large DNA and protein complexes: nucleosome centriole and microtubule-organizing center (MTOC) cytoskeleton ... Purple bacteria have "chromatophores", which are reaction centers found in invaginations of the cell membrane. Green sulfur ... which are photosynthetic antenna complexes found bonded to cell membranes. Cyanobacteria have internal thylakoid membranes for ... Such cell structures include: large RNA and protein complexes: ribosome, spliceosome, vault large protein complexes: proteasome ...
... needed to drive this electron transport chain come from light-gathering proteins called photosynthetic reaction centres. ... In animals, these reactions involve complex organic molecules that are broken down to simpler molecules, such as carbon dioxide ... Reaction centers are classified into two types depending on the nature of photosynthetic pigment present, with most ... This process uses the ATP and NADPH produced by the photosynthetic reaction centres, as described above, to convert CO2 into ...
These genes code for photosynthetic reaction centers and other components of the photosynthetic electron transport chain. A ... genes most commonly retained in mitochondrial DNA fulfil central roles in the structure of their respective protein complexes, ... Most genes for proteins of chloroplasts and mitochondria are, however, now located on chromosomes in the nuclei of eukaryotic ... Different products of protein synthesis in isolated chloroplasts and mitochondria are obtained in the presence of redox ...
... of all proteins in the cell. Metals are known to be involved in over 40% of enzymatic reactions, and metal-binding proteins ... The incorporation of a manganese center in photosystem II was highly significant, as it allowed for photosynthetic oxygen ... The incorporation of Mn in proteins allowed the complexes the ability to reduce reactive oxygen species in Mn-superoxide ... They belong to a class of enzymes with a mononuclear Mo center and they catalyze the metabolism reaction of C, N, S, etc., in ...
Light-harvesting complexes are involved in the energy transfer to the reaction centre. These are integral membrane protein ... the photosynthetic unit which is composed by the light-harvesting complexes LHI and LHII and the photosynthetic reaction centre ... Light-harvesting complexes surrounding a reaction centre (RC) harvest photons in the form of resonance energy, exciting ... LHI is directly associated with the reaction centre forming a polymeric ring-like structure around it. LHI has an absorption ...
Photosynthetic reaction center Pairs of bacteriochlorophylls (green) inside the membrane capture energy from sunlight, then ... Heterotrimeric G proteins 1996 - Green fluorescent protein 1996 - CDK/cyclin complex 1996 - Kinesin motor protein 1997 - GroEL/ ... Crystal structures of protein and nucleic acid molecules and their complexes are central to the practice of most parts of ... 1986 - Repressor/DNA interactions 1987 - Major histocompatibility complex' 1987 - Ubiquitin 1987 - ROP protein 1989 - HIV-1 ...
... photosynthetic reaction centers). There, the electric field which is formed in the reaction center, following the light induced ... such as proteins. The photoacoustic immunoassay labels and detects target proteins using nanoparticles that can generate strong ... The second mechanism shows up in photosynthetically active sub-cell complexes in suspension (e.g. ... The photoacoustic signal from preparations which carry out the primary electron transfer reactions (e.g. reaction centers) is a ...
... that are carried out through pigment-protein complexes (e.g. Photosystem II). Pigment-protein complexes (PPC) contain ... The light-driven charge separation process occurs at the reaction center due to the cooperation of two porphyrin derivatives. ... The dynamic and efficient antenna complexes that are present in photosynthetic organisms has inspired the design of synthetic ... are light harvesting complex 1 and light harvesting complex 2. Light harvesting complex 2 in the purple bacteria Rhodoblastus ...
The proteins encoded by psbA genes form the reaction center of the photosystem II complex. It was proposed that PhotoRC RNAs ... refer to conserved RNA structures that are associated with genes acting in the photosynthetic reaction centre of photosynthetic ...
Complexes with Mn, Fe, and Co catalyze a variety of reactions of potential interest in organic synthesis. Some complexes ... One of the best-known families of porphyrin complexes is heme, the pigment in red blood cells, a cofactor of the protein ... Another difference is that its methyne centers are occupied by phenyl groups. Simplified view of heme, a complex of a ... In non-photosynthetic eukaryotes such as animals, insects, fungi, and protozoa, as well as the α-proteobacteria group of ...
Nitrogen isotopes in bone collagen are ultimately derived from dietary protein, while carbon can be contributed by protein, ... Danforth argues that more "complex" state-level societies display greater health differences between elites and the rest of ... which developed in the United States in the 1970s as a reaction to a mainly cultural-historical approach to understanding the ... "Photosynthetic Pathways and Climate", Global Biogeochemical Cycles in the Climate System, Elsevier, pp. 267-277, doi:10.1016/ ...
Both PER and TIM proteins are phosphorylated and after they form the PER-TIM nuclear complex they return inside the nucleus to ... Konopka, Jeffrey Hall, Michael Roshbash and their team showed that per locus is the centre of the circadian rhythm, and that ... In addition, photoperiodism, the physiological reaction of organisms to the length of day or night, is vital to both plants and ... On the other hand, decreased photosynthetic sugar levels increase PRR7 expression and decrease CCA1 expression. This feedback ...
Photosynthetic reaction centre; Light-dependent reactions). To balance ion potential across the membrane, magnesium ions (Mg2+ ... Non-carbon-fixing proteins similar to RuBisCO, termed RuBisCO-like proteins (RLPs), are also found in the wild in organisms as ... No Michaelis complex is formed in this process. Hydration of this ketone results in an additional hydroxy group on C3, forming ... Thus, the inability of the enzyme to prevent the reaction with oxygen greatly reduces the photosynthetic capacity of many ...
The water-splitting reaction is catalyzed by the oxygen evolving complex of photosystem II. This protein-bound inorganic ... In order to repeat the reaction, the electron in the reaction center needs to be replenished. This occurs by oxidation of water ... The general reaction of photosynthetic photolysis can be given in terms of photons as: H 2 A + 2 photons ⟶ 2 e − + 2 H + + A {\ ... The electron-deficient reaction center of photosystem II (P680*) is the strongest biological oxidizing agent yet discovered, ...
This complex further complexes with the ubiquitin ligase protein CUL4A and with PARP1. This larger complex rapidly associates ... In the initiation step, RecA protein binds to ssDNA in an ATP hydrolysis driven reaction creating RecA-ssDNA filaments. RecA- ... The emergence of Earth's oxygen-rich atmosphere (known as the "oxygen catastrophe") due to photosynthetic organisms, as well as ... Human DNA Repair Genes, 15 April 2014, MD Anderson Cancer Center, University of Texas Jin B, Robertson KD (2013). "DNA ...
PSII centres are continuously repaired via degradation and synthesis of the D1 protein of the photosynthetic reaction center of ... later identified as the PSII reaction center protein D1. The photosensitivity of PSII from which the oxygen evolving complex ... Anthocyanin Chlorophyll Kautsky effect Light reaction Photosynthetic reaction centre Photosynthesis Kok B (1956). "On the ... consists of degradation and synthesis of the D1 protein of the PSII reaction centre, followed by activation of the reaction ...
He is well known for his work on bacterial photosynthetic reaction centres, hydrogenase enzymes, and the oxygen-evolving ... Using artificial maturation, the protein could be generated without the co-factor (apoprotein) using E. coli mutagenesis and a ... "Detection of the Water-Binding Sites of the Oxygen-Evolving Complex of Photosystem II Using W-Band 17O Electron-Electron Double ... These techniques have been used by him and his group to extensively study bacterial photosynthetic reaction centres, their ...
If not at a deep sea origin, redox reactions coupled to meteoric quinones would have led to the development of proton gradients ... While modern cells can rely on complicated protein machineries to catalyze these crucial processes, protocells must have ... Unpredictable phenomenon in complex systems Entropy and life - Relationship between the thermodynamic concept of entropy and ... sequestering the hydrophobic single-tail regions in the micelle centre. This phase is caused by the packing behavior of single- ...
Pullerits, Tõnu; Sundström, Villy (1996-08-13). "Photosynthetic Light-Harvesting Pigment−Protein Complexes: Toward ... His group's research centers on the photophysics and photochemical processes in model systems of natural and artificial ... Sundström, Villy (2000). "Light in elementary biological reactions". Progress in Quantum Electronics. 24 (5): 187-238. Bibcode: ... protein complex involves an intramolecular charge transfer state". Proceedings of the National Academy of Sciences. 99 (26): ...
The cathode half reaction is: 2 H+ + 2 e− → H 2 The anode half reaction is: 2 H 2O → O 2 + 4 H+ + 4 e− The gases produced ... Thus, FeSO 4·7H 2O consists of [Fe2(H2O)6]2+ centers and one "lattice water". Water is typically a monodentate ligand, i.e., it ... Most photoreceptors and photosynthetic pigments utilize the portion of the light spectrum that is transmitted well through ... H+ represents H 3O+ (H 2O) n and more complex ions that form. Negative thermal expansion is also observed in molten silica. ...
Williams JG (1988). "Construction of specific mutations in photosystem II photosynthetic reaction center by genetic engineering ... As noted above in RNA Polymerase and Sigma Factors, the beta clamp proteins within the RNAP complex have a higher initial ... SynechoNET: integrated protein-protein interaction database of a model cyanobacterium Synechocystis sp. PCC 6803. SynechoNET is ... STRING: STRING is a database of known and predicted protein-protein interactions. The interactions include direct (physical) ...
Researchers recently discovered archaeal involvement in ammonia oxidation reactions. These reactions are particularly important ... These proteins found in the cell membranes are capable of converting light energy to biochemical energy due to a change in ... More complex life, in the form of crown eukaryotes, didn't appear until the Cambrian explosion a mere 500 million years ago. ... doi:10.1007/978-3-319-47935-4_7. ISBN 978-3-319-47933-0. NCBI Taxonomy Browser: Roseobacter National Center for Biotechnology ...
Inside green sulfur bacteria, the chlorosomes are attached to type-I reaction centers in the cell membrane via FMO-proteins and ... They differ from other antenna complexes by their large size and lack of protein matrix supporting the photosynthetic pigments ... but instead use a protein complex called B808-866. Unlike the FMO proteins in green sulfur bacteria, B808-866 proteins are ... embedded in the cytoplasmic membrane and surround type-II reaction centers, providing the link between the reaction centers and ...
... they absorb is shuttled by resonance energy transfer to a specialized chlorophyll-protein complex known as the reaction center ... "Regulation of photosynthetic light harvesting involves intrathylakoid lumen pH sensing by the PsbS protein". The Journal of ... The reaction center initiates a complex series of chemical reactions that capture energy in the form of chemical bonds. For ... Light-harvesting complexes (Protein domains, Protein families, Transmembrane proteins, Plant physiology, Photosynthesis). ...
... and a complex array of RNA and protein molecules to "read" these instructions and use them for growth, maintenance, and self- ... orbiting the nebular center. The center of the nebula, not having much angular momentum, collapsed rapidly, the compression ... The first step in the emergence of life may have been chemical reactions that produced many of the simpler organic compounds, ... A similar event occurred with photosynthetic cyanobacteria entering large heterotrophic cells and becoming chloroplasts.: 60-61 ...
Plants and other photosynthetic organisms are at the base of most food chains because they use the energy from the sun and ... Their energy is used in the light-independent reactions of the Calvin cycle by the enzyme rubisco to produce molecules of the 3 ... Gene expression can also be controlled by repressor proteins that attach to silencer regions of the DNA and prevent that region ... Clements is credited with the idea of climax vegetation as the most complex vegetation that an environment can support and ...
R. castenholzii has three photosynthetic complexes: light-harvesting, reaction center, and light-harvesting - reaction center. ... October 2009). "Characterization of a blue-copper protein, auracyanin, of the filamentous anoxygenic phototrophic bacterium ... reaction center (LHRC), light-harvesting (LH) only, and reaction center (RC) only complexes. In contrast to most other FAPs, R ... "Structural and spectroscopic properties of a reaction center complex from the chlorosome-lacking filamentous anoxygenic ...
The US NOAA Geophysical Data Center defines a "warm spring" as a spring with water between 20 and 50 °C (68 and 122 °F). Water ... The 2,850 hot springs of Beppu in Japan are the highest flow hot spring complex in Japan. Together the Beppu hot springs ... Where continuous exposure to sunlight leads to the development of photosynthetic properties and later colonize on land and life ... Without continuous wet-dry cycling to maintain stability of primitive proteins for membrane transport and other biological ...
... and similar proteins in the photosynthetic reaction center. The endosymbiotic theory suggests that photosynthetic bacteria were ... Embedded in the thylakoid membrane are integral and peripheral membrane protein complexes of the photosynthetic system. Plants ... DNA in chloroplasts codes for redox proteins such as those found in the photosynthetic reaction centers. The CoRR Hypothesis ... Integrated fluorometer Light-dependent reaction Organic reaction Photobiology Photoinhibition Photosynthetic reaction center ...
These complex processes seemed to be able to remove the colour compounds, but simplified, cheaper techniques using other types ... The ethanol is converted in acetic acids after reaction with oxygen, lowering the pH to levels of around 4. The high acidity ... Pulp and mucilage consists to a large extent of proteins, sugars and the mucilage in particular of pectins, i.e. polysaccharide ... Lower levels of transparency, however, can have a negative impact on photosynthetic processes and growth and nutrient ...
With exception of chlorophyll a, all the other associated pigments are "accessory" and transfer energy to the reaction centers ... Photosynthetic pigments such as chlorophylls a,b,c and some others, e.g., xanthophylls, carotenoids, phycobilins are also ... These are the sites of light absorption and ATP synthesis, and contain many proteins, including those involved in the electron ... TIC/TOC complex (Membrane biology). ... come via endosymbiosis by engulfment of a photosynthetic ...
The problem of finding a reaction centre in a protein matrix is formally equivalent to many problems in computing. Mapping ... photons must reach reaction sites before their energy dissipates in less than one nanosecond. In photosynthetic processes, this ... The Fenna-Matthews-Olson (FMO) complex is a water-soluble complex and was the first pigment-protein complex (PPC) to be ... Renger, Thomas; Marcus, R. A. (2002). "On the relation of protein dynamics and exciton relaxation in pigment-protein complexes ...
The origin of unidirectional charge separation in photosynthetic reaction centers: nonadiabatic quantum dynamics of exciton and ... charge in pigment-protein complexes Hiroyuki Tamura, Keisuke Saito and Hiroshi Ishikita ... Essential factors leading to unidirectional charge separation in photosynthetic reaction centers are clarified via nonadiabatic ... Leveraging autocatalytic reactions for chemical domain image classification Christopher E. Arcadia, Amanda Dombroski, Kady ...
N2 - Reaction centers are pigment-protein complexes that drive photosynthesis by converting light into chemical energy. It is ... "Structure of a symmetric photosynthetic reaction center-photosystem",. abstract = "Reaction centers are pigment-protein ... AB - Reaction centers are pigment-protein complexes that drive photosynthesis by converting light into chemical energy. It is ... Reaction centers are pigment-protein complexes that drive photosynthesis by converting light into chemical energy. It is ...
Surprisingly, even plants with very low levels of light-harvesting complexes were able to undergo state transitions. We also ... we have assessed the functioning of the photosynthetic apparatus in plants with very different chloroplast compositions. Using ... show that apparent discrepancies between chloroplast composition and photosynthetic function can be attributed to varying ... Plants respond to growth under different environmental conditions by adjusting the composition of the photosynthetic apparatus ...
D27.505.954.600.710 Photosynthetic Reaction Center Complex Proteins D12.776.758 D5.500.562.488 D12.776.183.750.750 D12.776. ... G1.358.500 Electron Transport Chain Complex Proteins D12.776.543.277 Electron Transport Complex I D12.776.543.277.500.500 ... 543.983.500 D12.776.765.199.750.750 Photosystem I Protein Complex D5.500.562.492 D5.500.562.488.500 D12.776.758.500 D12.776. ... D12.776.765.199.750.750.500 Photosystem II Protein Complex D5.500.562.496 D5.500.562.488.750 D12.776.758.750 D12.776.183.750. ...
Photosynthetic Reaction Center Complex Proteins 100% * Cytokinins 92% * Droughts 85% * Genetically Modified Plants 67% ... IPT Prevents the degradation of photosynthetic protein complexes during drought. Rivero, R. M., Gimeno, J., Van Deynze, A., ... Protein abundances are more conserved than mRNA abundances across diverse taxa. Laurent, J. M., Vogel, C., Kwon, T., Craig, S. ... Rice Ovate Family Protein 2 (OFP2) alters hormonal homeostasis and vasculature development. Schmitz, A. J., Begcy, K., Sarath, ...
Photosynthetic Reaction Center Complex Proteins. Photosynthetic Reaction Center, Plant. Photosynthetic Reaction Center Complex ... Pregnancy-Associated beta-Plasma Protein. Pregnancy-Specific beta 1-Glycoprotein. D15 - CENTRAL NERVOUS SYSTEM AGENTS. Anti- ... Photosynthetic Reaction Center, Bacterial. ... Salivary Proteins. Pregnancy Zone Proteins. Pregnancy Proteins ... D12 - AMINO ACIDS, PEPTIDES, AND PROTEINS. Parotin. ... Proteins. D10 - LIPIDS AND ANTILIPEMIC AGENTS. Lipids and ...
Photosynthetic Reaction Center. Photosynthetic Reaction Center Complex Protein. Photosynthetic Reaction Centers. Reaction ... Center, Photosynthetic Reaction Photosynthetic Reaction Center Reaction Center, Photosynthetic Reaction Centers, Photosynthetic ... Center, Photosynthetic Reaction. Complex, Photosynthetic. Complexes, Photosynthetic. Photosynthetic Complex. Photosynthetic ... Photosynthetic Reaction Center Complex Protein Photosynthetic Reaction Centers - Related but not broader or narrower Concept UI ...
Photosynthetic Reaction Center Complex Proteins. Photosynthetic Reaction Center, Plant. Photosynthetic Reaction Center Complex ... Pregnancy-Associated beta-Plasma Protein. Pregnancy-Specific beta 1-Glycoprotein. D15 - CENTRAL NERVOUS SYSTEM AGENTS. Anti- ... Photosynthetic Reaction Center, Bacterial. ... Salivary Proteins. Pregnancy Zone Proteins. Pregnancy Proteins ... D12 - AMINO ACIDS, PEPTIDES, AND PROTEINS. Parotin. ... Proteins. D10 - LIPIDS AND ANTILIPEMIC AGENTS. Lipids and ...
Photosynthetic Reaction Center Complex Proteins. Photosynthetic Reaction Center, Plant. Photosynthetic Reaction Center Complex ... Pregnancy-Associated beta-Plasma Protein. Pregnancy-Specific beta 1-Glycoprotein. D15 - CENTRAL NERVOUS SYSTEM AGENTS. Anti- ... Photosynthetic Reaction Center, Bacterial. ... Salivary Proteins. Pregnancy Zone Proteins. Pregnancy Proteins ... D12 - AMINO ACIDS, PEPTIDES, AND PROTEINS. Parotin. ... Proteins. D10 - LIPIDS AND ANTILIPEMIC AGENTS. Lipids and ...
Photosynthetic Reaction Center Complex Proteins. Photosynthetic Reaction Center, Plant. Photosynthetic Reaction Center Complex ... Pregnancy-Associated beta-Plasma Protein. Pregnancy-Specific beta 1-Glycoprotein. D15 - CENTRAL NERVOUS SYSTEM AGENTS. Anti- ... Photosynthetic Reaction Center, Bacterial. ... Salivary Proteins. Pregnancy Zone Proteins. Pregnancy Proteins ... D12 - AMINO ACIDS, PEPTIDES, AND PROTEINS. Parotin. ... Proteins. D10 - LIPIDS AND ANTILIPEMIC AGENTS. Lipids and ...
Photosynthetic Reaction Center Complex Proteins. Photosynthetic Reaction Center, Plant. Photosynthetic Reaction Center Complex ... Pregnancy-Associated beta-Plasma Protein. Pregnancy-Specific beta 1-Glycoprotein. D15 - CENTRAL NERVOUS SYSTEM AGENTS. Anti- ... Photosynthetic Reaction Center, Bacterial. ... Salivary Proteins. Pregnancy Zone Proteins. Pregnancy Proteins ... D12 - AMINO ACIDS, PEPTIDES, AND PROTEINS. Parotin. ... Proteins. D10 - LIPIDS AND ANTILIPEMIC AGENTS. Lipids and ...
Photosynthetic Reaction Center Complex Proteins. Photosynthetic Reaction Center, Plant. Photosynthetic Reaction Center Complex ... Pregnancy-Associated beta-Plasma Protein. Pregnancy-Specific beta 1-Glycoprotein. D15 - CENTRAL NERVOUS SYSTEM AGENTS. Anti- ... Photosynthetic Reaction Center, Bacterial. ... Salivary Proteins. Pregnancy Zone Proteins. Pregnancy Proteins ... D12 - AMINO ACIDS, PEPTIDES, AND PROTEINS. Parotin. ... Proteins. D10 - LIPIDS AND ANTILIPEMIC AGENTS. Lipids and ...
Photosynthetic Reaction Center Complex Proteins. Photosynthetic Reaction Center, Plant. Photosynthetic Reaction Center Complex ... Pregnancy-Associated beta-Plasma Protein. Pregnancy-Specific beta 1-Glycoprotein. D15 - CENTRAL NERVOUS SYSTEM AGENTS. Anti- ... Photosynthetic Reaction Center, Bacterial. ... Salivary Proteins. Pregnancy Zone Proteins. Pregnancy Proteins ... D12 - AMINO ACIDS, PEPTIDES, AND PROTEINS. Parotin. ... Proteins. D10 - LIPIDS AND ANTILIPEMIC AGENTS. Lipids and ...
Photosynthetic Reaction Center Complex Proteins. Photosynthetic Reaction Center, Plant. Photosynthetic Reaction Center Complex ... Pregnancy-Associated beta-Plasma Protein. Pregnancy-Specific beta 1-Glycoprotein. D15 - CENTRAL NERVOUS SYSTEM AGENTS. Anti- ... Photosynthetic Reaction Center, Bacterial. ... Salivary Proteins. Pregnancy Zone Proteins. Pregnancy Proteins ... D12 - AMINO ACIDS, PEPTIDES, AND PROTEINS. Parotin. ... Proteins. D10 - LIPIDS AND ANTILIPEMIC AGENTS. Lipids and ...
Photosynthetic Reaction Center Complex Proteins. en_US. dc.subject.mesh. Plant Proteins --metabolism. en_US. ... Wavare RA, Prusti RK, Mohanty P. Catechol stimulation of ferricyanide Hill reaction by spheroplasts of cyanobacterium, ... Catechol stimulation of ferricyanide Hill reaction by spheroplasts of cyanobacterium, Synechococcus cedrorum: effect of ...
Photosynthetic Reaction Center Complex Proteins. Photosynthetic Reaction Center, Plant. Photosynthetic Reaction Center Complex ... Pregnancy-Associated beta-Plasma Protein. Pregnancy-Specific beta 1-Glycoprotein. D15 - CENTRAL NERVOUS SYSTEM AGENTS. Anti- ... Photosynthetic Reaction Center, Bacterial. ... Salivary Proteins. Pregnancy Zone Proteins. Pregnancy Proteins ... D12 - AMINO ACIDS, PEPTIDES, AND PROTEINS. Parotin. ... Proteins. D10 - LIPIDS AND ANTILIPEMIC AGENTS. Lipids and ...
Photosynthetic Reaction Center Complex Proteins. Photosynthetic Reaction Center, Plant. Photosynthetic Reaction Center Complex ... Pregnancy-Associated beta-Plasma Protein. Pregnancy-Specific beta 1-Glycoprotein. D15 - CENTRAL NERVOUS SYSTEM AGENTS. Anti- ... Photosynthetic Reaction Center, Bacterial. ... Salivary Proteins. Pregnancy Zone Proteins. Pregnancy Proteins ... D12 - AMINO ACIDS, PEPTIDES, AND PROTEINS. Parotin. ... Proteins. D10 - LIPIDS AND ANTILIPEMIC AGENTS. Lipids and ...
Photosynthetic Reaction Center Complex Proteins. Photosynthetic Reaction Center, Plant. Photosynthetic Reaction Center Complex ... Pregnancy-Associated beta-Plasma Protein. Pregnancy-Specific beta 1-Glycoprotein. D15 - CENTRAL NERVOUS SYSTEM AGENTS. Anti- ... Photosynthetic Reaction Center, Bacterial. ... Salivary Proteins. Pregnancy Zone Proteins. Pregnancy Proteins ... D12 - AMINO ACIDS, PEPTIDES, AND PROTEINS. Parotin. ... Proteins. D10 - LIPIDS AND ANTILIPEMIC AGENTS. Lipids and ...
Photosynthetic Reaction Center Complex Proteins. Photosynthetic Reaction Center, Plant. Photosynthetic Reaction Center Complex ... Pregnancy-Associated beta-Plasma Protein. Pregnancy-Specific beta 1-Glycoprotein. D15 - CENTRAL NERVOUS SYSTEM AGENTS. Anti- ... Photosynthetic Reaction Center, Bacterial. ... Salivary Proteins. Pregnancy Zone Proteins. Pregnancy Proteins ... D12 - AMINO ACIDS, PEPTIDES, AND PROTEINS. Parotin. ... Proteins. D10 - LIPIDS AND ANTILIPEMIC AGENTS. Lipids and ...
Photosynthetic Reaction Center Complex Proteins. Photosynthetic Reaction Center, Plant. Photosynthetic Reaction Center Complex ... Pregnancy-Associated beta-Plasma Protein. Pregnancy-Specific beta 1-Glycoprotein. D15 - CENTRAL NERVOUS SYSTEM AGENTS. Anti- ... Photosynthetic Reaction Center, Bacterial. ... Salivary Proteins. Pregnancy Zone Proteins. Pregnancy Proteins ... D12 - AMINO ACIDS, PEPTIDES, AND PROTEINS. Parotin. ... Proteins. D10 - LIPIDS AND ANTILIPEMIC AGENTS. Lipids and ...
Photosynthetic Reaction Center Complex Proteins. Photosynthetic Reaction Center, Plant. Photosynthetic Reaction Center Complex ... Pregnancy-Associated beta-Plasma Protein. Pregnancy-Specific beta 1-Glycoprotein. D15 - CENTRAL NERVOUS SYSTEM AGENTS. Anti- ... Photosynthetic Reaction Center, Bacterial. ... Salivary Proteins. Pregnancy Zone Proteins. Pregnancy Proteins ... D12 - AMINO ACIDS, PEPTIDES, AND PROTEINS. Parotin. ... Proteins. D10 - LIPIDS AND ANTILIPEMIC AGENTS. Lipids and ...
Photosynthetic Reaction Center Complex Proteins 100% * Photosystem II Protein Complex 60% * Photosynthesis 53% ... Mimicry and functions of photosynthetic reaction centers. Fukuzumi, S., Lee, Y. M. & Nam, W., 9 Oct 2018, In: Biochemical ... Metal ion-coupled electron-transfer reactions of metal-oxygen complexes. Devi, T., Lee, Y. M., Nam, W. & Fukuzumi, S., 15 May ... Mononuclear Nonheme High-Spin (S=2) versus Intermediate-Spin (S=1) Iron(IV)-Oxo Complexes in Oxidation Reactions. Bae, S. H., ...
Photosynthetic Reaction Center Complex Proteins 100% * Bacteriochlorophylls 61% * Charge Separation 53% * Electrons 42% ... A superexchange mechanism for the primary charge separation in photosynthetic reaction centers. Bixon, M., Jortner, J., Michel- ... Activationless and pseudoactivationless primary electron transfer in photosynthetic bacterial reaction centers. Bixon, M. & ...
Chloroplast Proteins - Photosynthetic Reaction Center Complex Proteins PubMed MeSh Term ©2022 Regents of the University of ... Chloroplast Proteins - Photosystem II Protein Complex PubMed MeSh Term *Overview. Overview. subject area of * Antioxidants in ... Winter down-regulation of intrinsic photosynthetic capacity coupled with up-regulation of Elip-like proteins and persistent ... Photosynthetic capacity and light harvesting efficiency during the winter-to-spring transition in subalpine conifers Journal ...
Photosynthetic Reaction Center Complex Proteins, Photosystem II Protein Complex, Plant Proteins, Protein Binding, Messenger RNA ... The 47 kDa protein, which, in contrast with the 43 kDa protein, sediments with a small sedimentation coefficient, is only ... The 43 kDa protein, which is present in the stroma and in membranes, co-sediments with a complex of 68S. It was purified, and ... untranslated region was identified that is necessary but not sufficient for binding of stromal proteins. The central protein ...
Membrane protein , Photosynthesis , Photosynthetic reaction center ... RCEL_RHOSH] The reaction center is a membrane-bound complex that mediates the initial photochemical event in the electron ... in the structure of the wild-type reaction center. The observed rearrangements in the structure of the AA reaction center ... Pokkuluri PR, Laible PD, Deng YL, Wong TN, Hanson DK, Schiffer M. The structure of a mutant photosynthetic reaction center ...
... and a soluble periplasmic protein cytochrome c(2) that shuttle between the reaction center and the bc(1) complex and act as ... Analysis of successive tomographic slices allowed for derivation of the spacing between adjacent photosynthetic core complexes ... complexes to the reaction centers is increased. The shorter membrane stacks, along with the notion that the bc(1) complex is ... result in a smaller average distance between the reaction centers and the bc(1) complexes, leading to shorter pathways of ...
... and regulation of photosynthetic machinery at University of Liverpool, listed on FindAPhD.com ... Photosynthetic light reactions are a particularly complex biochemical process involving multiple protein complexes working ... The photosynthetic apparatus is typically composed of light-harvesting antenna for capturing solar energy, reaction centres for ... This project aims to unravel the biosynthesis and functions of photosynthetic complexes and machinery in purple photosynthetic ...
... give rise to electron transfer reactions along the path of a series of protein. ... pigments and other co-factors that together execute the primary energy conversion reactions of lar excitations, either ... A photosynthetic reaction center is a complex of several proteins, ... Charge Separation in Photosynthetic Reaction Centers. Reaction centers (RCs) are pigment-protein complexes that carry out the ...
The absorbed energy is transferred to reaction centers where it is used to fuel biological processes. Pump-probe and time- ... emerged as a powerful technique for detailed study of the ultrafast energy transfer within photosynthetic systems. ... Excitation of light-harvesting pigment-protein complexes is the first step in photosynthesis. ... Employing this method on the Fenna-MatthewOlson (FMO) photosynthetic protein complex has shown that, unlike previously thought ...
  • Reaction centers are pigment-protein complexes that drive photosynthesis by converting light into chemical energy. (elsevier.com)
  • This structure preserves characteristics of the ancestral reaction center, providing insight into the evolution of photosynthesis. (elsevier.com)
  • Protein complexes that take part in the process of PHOTOSYNTHESIS . (bvsalud.org)
  • RCEL_RHOSH ] The reaction center is a membrane-bound complex that mediates the initial photochemical event in the electron transfer process of photosynthesis. (proteopedia.org)
  • Understanding how the photosynthetic machinery is synthesized and works in an astonishing variety of environmental conditions is fundamentally important for advancing our knowledge of natural photosynthesis and aiding synthetic biology to generate artificial photosynthetic systems for bioenergy production. (findaphd.com)
  • The light reactions of photosynthesis begin when a photon, or small. (thebindyagency.com)
  • Curtis W. Hoganson, Maurice W. Windsor, Daniel I. Farkas and William W. Parson, Pressure effects on the photochemistry of bacterial photosynthetic reaction centers from Rhodobacter sphaeroides R and Rhodopseudomonas viridis, Biochimica et Biophysica Acta (BBA) - Bioenergetics,3, Cited by: High-pressure tuning of primary photochemistry in bacterial photosynthesis: membrane-bound versus detergent-isolated reaction centers. (thebindyagency.com)
  • Excitation of light-harvesting pigment-protein complexes is the first step in photosynthesis. (uga.edu)
  • In the first step of photosynthesis, light energy is absorbed by pigment protein complexes designed especially for light harvesting, called light harvesting, or antenna complexes. (escholarship.org)
  • Under high light conditions, NPQ switches the function of light harvesting complexes to dissipate the energy they collect as heat in order to protect the reaction centers from damage when their capacity for productive photosynthesis is overwhelmed. (escholarship.org)
  • In photosynthesis, the harvesting of solar energy and its subsequent conversion into a stable charge separation are dependent upon an interconnected macromolecular network of membrane-associated chlorophyll-protein complexes. (nature.com)
  • Flexibility and size heterogeneity of the LH1 light harvesting complex revealed by atomic force microscopy: functional significance for bacterial photosynthesis. (nature.com)
  • The researchers suggest that both groups are clearly closely related to photosynthetic cyanobacteria, based on their genomes, but the two groups do not perform photosynthesis themselves. (uncommondescent.com)
  • During photosynthesis, the oxidation of water to release O 2 is catalyzed by the oxygen-evolving complex (OEC) of photosystem II (PSII). (memphis.edu)
  • In natural photosynthesis, the conversion of light energy to chemical potential starts from a charge separation process occurring at the P680 Chl a in the reaction center, producing the strongest known biological oxidant, an oxidized charged radical P680 +∙ , which can oxidize the OEC via a redox-active tyrosine residue D1-Tyr161 to achieve sunlight-induced water oxidation. (memphis.edu)
  • Proteins with known x-ray structure and high stability offer a great chance to construct all the essential components of artificial photosynthesis in a specific order and spatial arrangement. (memphis.edu)
  • Photosynthesis is particularly sensitive to drought stress, and when its efficiency decreases due to drought, the excess absorbed light energy causes photodamage and photoinhibition in the photosynthetic electron transport chain (Pinheiro and Chaves, 2011). (plantae.org)
  • In oxygenic photosynthesis--the type which occurs in green plants, algae, and bacteria known as cyanobacteria--the cooperation of two reaction centers, denoted Photosystems I and II, are required. (elsevier.com)
  • Plant biologists have long held the view that photosynthesis -- the process by which cells in green plants convert the energy of sunlight into chemical energy and use carbon dioxide to produce sugars -- needs two intermediate light-dependent reactions for successful energy conversion: Photosystem II and Photosystem I. (nasa.gov)
  • T raining in biochemistry and physiology with experience relating to both the light and dark reactions of photosynthesis. (ct.gov)
  • 12. VAN NIEL (STUDIES ON PURPLE AND GREEN BACTERIA) à Demonstrated that photosynthesis is essentially a light-dependent reaction in which hydrogen from a suitable oxidizable compound reduces carbon dioxide to carbohydrates. (worksheetsbag.com)
  • All of Earth's oxygen is the result of water oxidation performed by photosynthetic organisms using solar light as the only energy source. (cam.ac.uk)
  • In my talk I will go over two of my post-doc projects, interrogating the ways different photosynthetic organisms - namely, cyanobacteria and purple bacteria - overcome environmental stress conditions, at the photosynthetic level. (technion.ac.il)
  • Altogether, we realized various means by which photosynthetic organisms adapt to environmental stresses, which can be utilized in future biohybrid or bioinspired energetic constructs. (technion.ac.il)
  • The efficiency of these electronic energy transfers has inspired much work on antenna proteins isolated from photosynthetic organisms to uncover the basic mechanisms at play. (princeton.edu)
  • Photosynthetic organisms have evolved light-harvesting antennae over time. (jbc.org)
  • Depletion of SQDG causes different degrees of effects on photosynthetic growth and activities in different organisms. (jbc.org)
  • The space experiments were performed on membrane proteins found in ancient organisms, formerly called blue-green algae or blue-green bacteria, and now collectively called cyanobacteria. (nasa.gov)
  • Photosynthetic organisms known as algae are mostly found in freshwater or marine environments. (risingacademy.org)
  • Some organisms deposit green pigments inside their cell walls because they are photosynthetic. (risingacademy.org)
  • The reaction center is a complex of protein and pigments (such as chlorophyll) that is the functional center of the photosystem. (thebindyagency.com)
  • The pulsed electric field linear dichroism technique is utilized to study the orientations of pigments in antenna bacteriochlorophyll-protein and reaction center complexes, and chromatophores isolated from the photosynthetic bacterium Rhodopseudomonas spheroides. (nyu.edu)
  • One way to change the distance between, and/or relative orientation of pigments within a pigment protein complex, or PPC, is a conformational change of the PPC. (escholarship.org)
  • The protein-pigment complex LHCII (light harvesting complex II) has a function of collecting light energy and transferring it to photosynthetic reaction centers efficiently by excitation energy transfer among chlorophyll pigments arranged in the complex. (u-tokyo.ac.jp)
  • The trimeric Fenna-Mathews-Olson (FMO) complex of green sulphur bacteria is a well-studied example of a photosynthetic pigment-protein complex, in which the electronic properties of the pigments are modified by the protein environment to promote efficient excitonic energy transfer from antenna complexes to the reaction centres. (ncl.ac.uk)
  • Pantazis, D. A. Electrostatic Profiling of Photosynthetic Pigments: Implications for Directed Spectral Tuning. (mpg.de)
  • Photosystem I contains at least twelve proteins and 100 chlorophyll pigments. (nasa.gov)
  • Lu-Ning Liu* (2020) Structural variability, coordination, and adaptation of a native photosynthetic machinery. (findaphd.com)
  • Figure 1: AFM of native photosynthetic membranes. (nature.com)
  • Our results include the X-ray diffraction analysis of a dense, quasi-hexagonal packing of the functional motif, showing a striking analogy with the coexistence of fluid-to-crystalline phases in the native photosynthetic membrane. (cam.ac.uk)
  • This project aims to unravel the biosynthesis and functions of photosynthetic complexes and machinery in purple photosynthetic bacteria and cyanobacteria. (findaphd.com)
  • This occurs by means of a reaction between the active species of OCP and phycobilisome (PBS) the protein complex that functions as a light harvesting antenna in the cyanobacteria. (jpost.com)
  • Until recently, all known cyanobacteria were photosynthetic members of class Oxyphotobacteria. (uncommondescent.com)
  • thus provides direct evidence of a link between DnaJ-DnaK proteins and D1 protein turnover in cyanobacteria. (plantae.org)
  • In cyanobacteria, external phycobilisomes (PBSs) are the dominant antennae, whereas in green algae and higher plants, PBSs have been replaced by proteins of the Lhc family that are integrated in the membrane. (jbc.org)
  • Lu-Ning Liu* (2021) Cryo-EM structure of the photosynthetic RC-LH1-PufX supercomplex at 2.8-Å resolution. (findaphd.com)
  • Projection structure of the photosynthetic reaction centre-antenna complex of Rhodospirillum rubrum at 8.5 Å resolution. (nature.com)
  • We report on the unexpected structural changes caused by substitution of acidic amino acids in the Q(B) binding pocket of the bacterial photosynthetic reaction center by alanines. (proteopedia.org)
  • 2 edition of Pressure effects on the photochemistry of bacterial photosynthetic reaction centers found in the catalog. (thebindyagency.com)
  • Pressure effects on the photochemistry of bacterial photosynthetic reaction centers from Rhodobacter sphaeroides R and Rhodopseudomonas viridis Author links open overlay panel Curtis W. Hoganson a ∗ Maurice W. Windsor a Daniel I. Farkas b ∗∗ William W. (thebindyagency.com)
  • Here we show the use of atomic force microscopy to directly reveal a native bacterial photosynthetic membrane. (nature.com)
  • The same fold is shared by Bacterial Permeability Inducing proteins (examples: BPIFP1 BPIFP2 BPIFA3 and BPIFB4), phospholipid transfer protein (PLTP), and long-Palate Lung, and Nasal Epithelium protein (L-PLUNC). (iiab.me)
  • Metatranscriptomics revealed that the chaperone system and proteins counteracting reactive oxygen species and toxic compounds have a key role in the maintenance of bacterial cell homeostasis in sediments of volcanic origin. (researchsquare.com)
  • The SS Cba protein is a collagen adhesin, and a few of its homologs are related to the enhancement of bacterial adhesion. (bvsalud.org)
  • Photosynthetic bacteria. (thebindyagency.com)
  • 1 Further developments allowed the in situ study of the photosynthetic apparatus of the green sulfur bacteria. (uga.edu)
  • Crystal structure of an integral membrane light-harvesting complex from photosynthetic bacteria. (nature.com)
  • Adir and his team discovered how bacteria protect their photosynthetic system from overexposure by blocking the energy. (jpost.com)
  • In the second project, we combined CryoEM and ultrafast transient absorption spectroscopy to investigate the femtosecond energy transfer processes within the photosynthetic network of purple bacteria. (technion.ac.il)
  • As a first piece of footage, we can think of no better than keynote speaker Klaus Schulten (UIUC)'s fascinating atom-by-atom movie titled " Photosynthetic Membrane of Purple Bacteria - A Clockwork of Proteins and Processes ", now made available with Schulten's narrative of the movie during the keynote lecture. (memprotein.org)
  • A German-research team presented results this month on a novel space shuttle experiment designed to crystallize one of the most important photosynthetic proteins, a natural molecule called Photosytem I, which cascades the conversion of sunlight to energy in plants, green algae and some bacteria. (nasa.gov)
  • The 43 kDa protein, which is present in the stroma and in membranes, co-sediments with a complex of 68S. (mdc-berlin.de)
  • 1) Scheuring, S. & Sturgis, J. N. Chromatic Adaptation of Photosynthetic Membranes. (cam.ac.uk)
  • 2005). The subaerial cyanobacterium Nostoc flagelliforme is found in arid areas with daily high light stress, and the photosynthetic membranes of N. flagelliforme are preserved during prolonged dehydration and recover rapidly during rehydration (Qiu et al. (plantae.org)
  • Application of optical probes such as chlorophyll fluorescence and 820-nm absorbance changes to regulation of photosynthetic electron transport in leaves. (ct.gov)
  • Crucial components for the photosynthetic process are antenna proteins, which absorb light and transmit the resultant excitation energy between molecules to a reaction centre. (princeton.edu)
  • Nonphotochemical quenching (NPQ) is a mechanism of regulating light harvesting that protects the photosynthetic apparatus from photodamage by dissipating excess absorbed excitation energy as heat. (jbc.org)
  • Because of their location relative to reaction centers, pigment composition, and their density, most absorbed light energy passes through antenna complexes before reaching reaction centers, making them ideal sites for photoprotective quenching, or nonphotochemical quenching. (escholarship.org)
  • We reconstituted two light harvesting antenna complexes (LH3, which is expressed under low light conditions, and LH2) in a membrane-forming lipid bilayer, which is encompassed by amphipathic belting proteins, forming a near-native nanodisc. (technion.ac.il)
  • High-pressure studies on the photochemical reaction center from the photosynthetic bacterium Rhodobacter sphaeroides, strain R, shows that, up to. (thebindyagency.com)
  • Professor Robert Huber studies protein structures and functions - and is very successful: For the determination of the three-dimensional structure of a photosynthetic reaction center in a bacterium, he was awarded the 1988 Nobel Prize in Chemistry together with two colleagues. (mpg.de)
  • Plants respond to growth under different environmental conditions by adjusting the composition of the photosynthetic apparatus. (ox.ac.uk)
  • To investigate the consequences of the acclimation strategies adopted by Arabidopsis thaliana, we have assessed the functioning of the photosynthetic apparatus in plants with very different chloroplast compositions. (ox.ac.uk)
  • The photosynthetic apparatus is typically composed of light-harvesting antenna for capturing solar energy, reaction centres for charge separation and energy conversion, cytochromes and ATP synthase for harnessing the energy stored in the proton gradient to phosphorylate ADP. (findaphd.com)
  • Zigmantas, D. In situ mapping of the energy flow through the entire photosynthetic apparatus. (uga.edu)
  • Indeed, and despite the vast bio-diversity footprint, just one specialized protein complex is used by Nature as the H2O -photolyzer: photosystem II (PSII). (cam.ac.uk)
  • High resolution imaging of the PSII "core" complex shows the ideal co-localization of multi-chromophore Light Harvesting antennas with the functional Reaction Center (LH-RC). (cam.ac.uk)
  • In order to understand the oxygen evolution reaction catalyzed by the OEC in PSII, our research focuses on the design of synthetic catalysts capable of water oxidation. (memphis.edu)
  • Photosystem II (PSII) is a thylakoid-membrane integral protein complex of the electron transport chain that particularly is sensitive to photodamage under drought. (plantae.org)
  • A crucial process in the function of PSII is the replacement of damaged proteins, especially D1, which is the core component of PSII reaction center. (plantae.org)
  • provide an in depth molecular analysis of DnaJ-DnaK proteins and their role in PSII repair in N. flagelliforme . (plantae.org)
  • FtsH proteases are ATP-dependent zinc metalloprotease involved in the turnover of the D1 protein during the PSII repair cycle. (plantae.org)
  • By promoting D1 protein turnover in association with the NfFtsH2 protease, DnaJ-DnaK proteins obviate the energy-intensive reconstruction of the PSII machinery during rehydration conditions (Klotz et al. (plantae.org)
  • It is an array of PSII-light-harvesting complex II (LHCII) supercomplexes that only appears in low light, but its functional role has not been clarified. (jbc.org)
  • Soil salinity inhibits photosynthetic processes, which can induce an over-reduction of the reaction centres in photosystem II (PSII), damaging the photosynthetic machinery. (usda.gov)
  • Crystal structure of the RC-LH1 core complex from Rhodopseudomonas palustris . (nature.com)
  • In 1982, Hartmut Michel reported in one of Huber's group seminars his spectacular success with the crystallization of the photosynthetic reaction centre from Rhodopseudomonas viridis . (iucr.org)
  • Light energy capture and transduction takes place in multiprotein complexes known as reaction centers, which utilize the light energy to initiate oxidation-reduction reactions and electron transfer events which result in the production of chemical energy (in the form of ATP) and chemical reductant (in the form of NADPH). (elsevier.com)
  • The effect of pressure up to 6 kbars on the near to mid infrared absorption spectrum (, cm(-1) or nm) of the oxidized reaction center of Rhodobacter sphaeroides is measured and. (thebindyagency.com)
  • The optimized IFC protocol enabled the simultaneous monitoring of diverse processes including generation of viral factories, transport, and fusion of replication centers within the cell, accumulation of viral progeny, and changes in cell morphology for tens of thousands of cells. (weizmann.ac.il)
  • The absorbed energy is transferred to reaction centers where it is used to fuel biological processes. (uga.edu)
  • Strigolactones play a vital role during plant growth and development due to their complex interplay during a plethora of biochemical processes. (bvsalud.org)
  • These include receptor antagonists , neurotransmitters , neurotransmitter reuptake , G protein-coupled receptors , G proteins, second messengers , the enzymes that trigger protein phosphorylation in response to cAMP , and consequent metabolic processes such as glycogenolysis . (wikipedia.org)
  • The 1992 Nobel Prize in Physiology or Medicine to Edwin G. Krebs and Edmond H. Fischer for describing how reversible phosphorylation works as a switch to activate proteins , and to regulate various cellular processes including glycogenolysis . (wikipedia.org)
  • Flavoproteins participate in a wide variety of physiologically relevant processes that typically involve redox reactions. (nih.gov)
  • Essential factors leading to unidirectional charge separation in photosynthetic reaction centers are clarified via nonadiabatic quantum dynamics calculations. (rsc.org)
  • Engineered proteins have been used as model systems to study the electron transfer events in native proteins and it has been shown that protein framework plays a major role in controlling electron transfer and charge separation. (memphis.edu)
  • The long-term goal of the research here proposed is to understand the structural organization of the Photosystem I reaction center and to unravel specific details of the electron transfer events that lead to charge separation, charge stabilization, and electron transfer to soluable carriers in this reaction center. (elsevier.com)
  • RNA-binding proteins play a major role in regulating mRNA metabolism in chloroplasts. (mdc-berlin.de)
  • We found that the slug Elysia timida induces changes to the photosynthetic light reactions of the chloroplasts it steals from the alga Acetabularia acetabulum . (elifesciences.org)
  • Once stolen, the chloroplasts, now termed kleptoplasts, remain functional inside the slug's cells for several weeks, essentially creating a photosynthetic slug. (elifesciences.org)
  • The symmetry of a homodimer is broken in heterodimeric reaction-center structures, such as those reported previously. (elsevier.com)
  • The successful applicant will use multidisciplinary techniques to investigate the structures, assembly and dynamics of membrane protein complexes, protein/lipid interactions, as well as membrane biogenesis process in the changing environments to regulate photosynthetic efficiency. (findaphd.com)
  • High-resolution structures of the protein from Gloeobacter violaceus and Synechocystis sp. (nih.gov)
  • He is currently studying the structures and functions of proteins of medical interest. (mpg.de)
  • Acclimation of Arabidopsis thaliana to the light environment: the relationship between photosynthetic function and chloroplast composition. (ox.ac.uk)
  • We also show that apparent discrepancies between chloroplast composition and photosynthetic function can be attributed to varying degrees of light penetration through the leaf. (ox.ac.uk)
  • Upon homology search it was identified as the chloroplast homologue of the Escherichia coli ribosomal protein S1. (mdc-berlin.de)
  • We hypothesized that chloroplast energy imbalance sensed through alterations in the redox state of the photosynthetic electron transport chain, measured as excitation pressure, governs the extent of variegation in the immutans mutant of Arabidopsis thaliana. (thebindyagency.com)
  • These synthetic systems will be subjected to a variety of spectroscopic, structural characterization, reaction mechanism and activity studies to evaluate the properties and applications of these synthetic molecules. (memphis.edu)
  • Intriguingly, recent work has documented that light-absorbing molecules in some photosynthetic proteins capture and transfer energy according to quantum-mechanical probability laws instead of classical laws at temperatures up to 180 K. This contrasts with the long-held view that long-range quantum coherence between molecules cannot be sustained in complex biological systems, even at low temperatures. (princeton.edu)
  • These observations provide compelling evidence for quantum-coherent sharing of electronic excitation across the 5-nm-wide proteins under biologically relevant conditions, suggesting that distant molecules within the photosynthetic proteins are 'wired' together by quantum coherence for more efficient light-harvesting in cryptophyte marine algae. (princeton.edu)
  • [3] Signaling molecules bind to a domain of the GPCR located outside the cell, and an intracellular GPCR domain then in turn activates a particular G protein. (wikipedia.org)
  • G proteins are important signal transducing molecules in cells. (wikipedia.org)
  • And finally, additional safeguard molecules 'deactivate' compounds that could otherwise mediate damaging reactions. (elifesciences.org)
  • Artificial cells are non-living system that includes no prerequisite designing modules for their formation and therefore allow freedom of assembling desired biological machinery within a physical boundary devoid of complex contemporary living-cell counterparts. (portlandpress.com)
  • Structure-function relationships of the psbS protein and its role in nonphotochemical quenching. (ct.gov)
  • Through our work we hope to provide a better understanding of photosynthetic solar energy capture and photochemical conversion. (elsevier.com)
  • Deletion of these proteins or their cyanobacterial homologs DnaK and DnaJ, respectively, results in reduced photosynthetic efficiency in plants, whereas overexpression slows the degradation of oxygen evolving complex proteins (Chen et al. (plantae.org)
  • Surprisingly, even plants with very low levels of light-harvesting complexes were able to undergo state transitions. (ox.ac.uk)
  • The amino acid substitutions in the L212Ala-L213Ala mutant reaction center ("AA") were known to affect the delivery of protons after the light-induced generation of Q(B)(-), which renders the AA strain incapable of photosynthetic growth. (proteopedia.org)
  • Photosynthetic light reactions are a particularly complex biochemical process involving multiple protein complexes working together in a specialized photosynthetic membrane. (findaphd.com)
  • Two types of organization were found for the peripheral light-harvesting LH2 complex. (nature.com)
  • The main player in this mechanism is OCP - a protein that changes its structure and color in response to intense light and blocks the flow of energy that reaches the center of the photosynthetic reaction. (jpost.com)
  • In response to strong light, part of the protein penetrates into the PBS and changes its structure, thereby diverting the flow of energy to the reaction centers. (jpost.com)
  • Our research aims to design photocatalysts to achieve light-induced water splitting, through the attachment of light-harvesting groups, such as ruthenium bipyridine complexes, to water oxidation catalysts in the presence of electron acceptors. (memphis.edu)
  • Through site-directed mutagenesis or covalent attachment, water oxidation catalysts, light-harvesting groups and electron acceptors could be incorporated into a protein scaffold to investigate how the spatial arrangement of these components will affect the energy and electron transfer process, thus providing guidelines for the design of better photocatalysts for water oxidation. (memphis.edu)
  • Here we present two-dimensional photon echo spectroscopy measurements on two evolutionarily related light-harvesting proteins isolated from marine cryptophyte algae, which reveal exceptionally long-lasting excitation oscillations with distinct correlations and anti-correlations even at ambient temperature. (princeton.edu)
  • Additionally, after high light exposure, the D1 protein turned over much faster in the transgenic strain, which also showed higher levels of FtsH compared to WT. (plantae.org)
  • The cyanobacterial Photosystem I reaction center is a light-driven oxidoreductase catalyzing electron transport from cytochrome c533 to ferredoxin. (elsevier.com)
  • Red algae represent an evolutionary intermediate between these two systems, as they employ both PBSs and membrane LHCR proteins as light-harvesting units. (jbc.org)
  • In higher plants, the major light-harvesting antenna complex (LHCII) of photosystem (PS) II is directly involved in NPQ. (jbc.org)
  • Pantazis, D. A. Chlorophyll Excitation Energies and Structural Stability of the CP47 Antenna of Photosystem II: a Case Study in the First-Principles Simulation of Light-Harvesting Complexes. (mpg.de)
  • When photons -- particles of light -- enter a plant cell, their energy is used to power these two sequential light-dependent reactions. (nasa.gov)
  • A unique light-harvesting POR:Pchlide complexes (LHPP) has been found in barley etioplasts, but not in other plant species. (usda.gov)
  • Extensive experience with measurements of gas exchange and light utilization and the biophysical parameters of electron transport in photosynthetic systems. (ct.gov)
  • Peterson RB , Schultes NP (2013) Light-harvesting complex B7 shifts the irradiance response of photosynthetic light-harvesting regulation in leaves of Arabidopsis thaliana . (ct.gov)
  • It is a light independent reaction but dependent upon light reaction products called ATP and NADPH.H. (worksheetsbag.com)
  • With the help of the Cyclotron accelerator at VECC, Kolkata, we use nuclear reactions with energetic light- and heavy-mass projectiles, to excite different modes in deformed (both axially symmetric and axially asymmetric) nuclei and identify them by detecting the gamma rays, they emit, in an array of clover HPGe detectors, a state-of-the-art modern semiconductor detector for the detection of gamma rays. (jcbose.ac.in)
  • There are two major complexes involved in the photosynthetic process called PHOTOSYSTEM I and PHOTOSYSTEM II . (bvsalud.org)
  • In this work we characterized two proteins, of 43 and 47 kDa, which bind to the spinach psbA mRNA 5' untranslated region (psbA encoding the D1 protein of photosystem II). (mdc-berlin.de)
  • Our research involves areas of inorganic, organometallic, bioinorganic chemistry and chemical biology, with particular interest in the design and engineering of models for the oxygen-evolving center in photosystem II, through either synthetic methods using organic ligands or biosynthetic approach using small, stable and well-characterized proteins. (memphis.edu)
  • Pantazis, D. A. Protein Matrix Control of Reaction Center Excitation in Photosystem II. (mpg.de)
  • Ali NA, Dewez D, Didur O, Popovic R (2006) Inhibition of photosystem II photochemistry by Cr is caused by the alteration of both D1 protein and oxygen evolving complex. (edu.pl)
  • Previous work has demonstrated that the function of some integral biological membrane proteins can be modulated by the lipid composition in the membrane, which in turn modulates the lateral pressure profile, and thereby the protein conformation. (escholarship.org)
  • In effect, the protein acts as a biological switch. (jpost.com)
  • A convectional reaction-diffusion is the main process causing a stable distribution of nutrients in biological objects. (sidpirgat.fun)
  • In Photosystem I (PSI), the group of proteins used in the space shuttle experiment, these electrons are used to produce compounds that ultimately react with carbon dioxide to produce carbohydrates, lipids, proteins and nucleic acids -- the fundamental components of life. (nasa.gov)
  • Cholesteryl ester transfer protein ( CETP ), also called plasma lipid transfer protein , is a plasma protein that facilitates the transport of cholesteryl esters and triglycerides between the lipoproteins . (iiab.me)
  • In this project biochemical resolution and reconstitution are combined with site-directed mutagenesis and protein overproduction in E.coli to produce reaction centers with altered spectroscopic and electron transport properties. (elsevier.com)
  • A combination of modern molecular genetics, recombinant DNA technology, site directed mutagenesis, protein overproduction and protein biochemistry (my lab) is combined with biochemical reconstitution, modern ultra-fast laser spectroscopy, electron spin resonance (ESR) spectroscopy, and other biophysical measurements (the Golbeck laboratory). (elsevier.com)
  • This work was funded by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, of the U.S. Department of Energy (DOE) through grant DE-SC0010575 to K.E.R., R.F., and J.H.G. and supported with x-ray crystallographic equipment and infrastructure provided by P. Fromme of the Biodesign Center for Applied Structural Discovery at Arizona State University. (elsevier.com)
  • However, in the past decades two-dimensional electronic spectroscopy (2DES) emerged as a powerful technique for detailed study of the ultrafast energy transfer within photosynthetic systems. (uga.edu)
  • Employing this method on the Fenna-MatthewOlson (FMO) photosynthetic protein complex has shown that, unlike previously thought, the mechanism of energy transfer is not a simple stepwise series of decay between electronic states. (uga.edu)
  • Because excess absorbed energy can cause severe damage to the photosynthetic reaction center proteins, it must be dissipated harmlessly as heat in order to protect the plant. (escholarship.org)
  • The LH1 complex is ideally positioned to function as an energy collection hub, temporarily storing it before transfer to the RC where photochemistry occurs: the elegant economy of the photosynthetic membrane is demonstrated by the close packing of these linear arrays, which are often only separated by narrow 'energy conduits' of LH2 just two or three complexes wide. (nature.com)
  • As soon as the radiation diminishes, the protein returns to its normal state and the flow of energy resumes. (jpost.com)
  • In total, photosynthetic biomass production is about eight times the total annual world consumption of energy from all sources, including those fuels derived from more ancient biomass like coal, petroleum and natural gas. (nasa.gov)
  • We have found that the 2-MDa cyanobacterial Photosystem I - Iron-Stressed Induced Antenna (PSI-IsiA) super-complex, expressed under iron-limiting conditions, retains strong energetic connectivity albeit structural fluctuations by having multiple energetic pathways from the IsiA antenna system to the PSI reaction center. (technion.ac.il)
  • Within this protein superfamily, there exists a group that is able to transfer reducing equivalents from FAD to a redox-active disulfide bridge, which further reduces disulfide bridges in target proteins to regulate their structure and function. (nih.gov)
  • Dynamics governing ultrafast chemical reactions can be efficiently simulated using analog quantum simulators composed of a coupled system of qudits and bosonic modes. (rsc.org)
  • However, the recent observation and analysis of long-lasting quantum dynamics in the FMO complex point to protein dynamics as a key factor in protecting and generating quantum coherence under laboratory conditions. (ncl.ac.uk)
  • The following study employs constrained geometric dynamics to study the flexibility in the protein network by efficiently generating the accessible conformational states from the published crystal structure. (ncl.ac.uk)
  • In the coming days, we will be releasing media footage from the exciting Frontiers in Membrane Protein Structural Dynamics 2014 meeting held at the Hilton Hotel in Chicago from May 7th-9th. (memprotein.org)
  • We initially posted this as a silent movie to accompany our interview with professor Schulten in which he addresses his scientific research interests both past and present, his perspective on some of the key challenges for the field of membrane protein biophysics in the coming 5-10 years, his keynote lecture, and the Membrane Protein Structural Dynamics Consortium. (memprotein.org)
  • Three weeks in advance of Frontiers in Membrane Protein Structural Dynamics 2014, Professor Klaus Schulten (Director of the Computational and Theoretical Biophysics Group at UIUC) phoned in with us from his native Germany to talk about his research interests, the state of the field, the Membrane Protein Structural Dynamics Consortium (MPSDC), and the keynote lecture that he will be giving at the conference. (memprotein.org)
  • This is Rudo Kemper conducting an interview with Professor Klaus Schulten from the University of Illinois at Urbana-Champaign for the Membrane Protein Structural Dynamics Consortium. (memprotein.org)
  • Fabris, S. Water oxidation surface mechanisms replicated by a totally inorganic tetraruthenium-oxo molecular complex. (cam.ac.uk)
  • In the first project, we combined single molecule fluorescence spectroscopy and cryogenic electron microscopy (CryoEM), gaining insight on the inherent heterogeneity protein complexes possess. (technion.ac.il)
  • unlike other reaction centers, it lacks a bound quinone. (elsevier.com)
  • The structure of a mutant photosynthetic reaction center shows unexpected changes in main chain orientations and quinone position. (proteopedia.org)
  • Pokkuluri PR, Laible PD, Deng YL, Wong TN, Hanson DK, Schiffer M. The structure of a mutant photosynthetic reaction center shows unexpected changes in main chain orientations and quinone position. (proteopedia.org)
  • Fleming, G. R. Ultrafast Multidimensional Spectroscopy: Principles and Applications to Photosynthetic Systems. (uga.edu)
  • Wolfgang Baumeister and his emeritus group investigate the architecture of proteins in their native environment and evaluate how they cooperate with other cell components. (mpg.de)
  • A machine learning model for enantioselectivity prediction using reaction-based molecular representations. (rsc.org)
  • Experience of lab work in protein biochemistry, microscopy, and molecular biology would be an advantage but not a prerequisite. (findaphd.com)
  • Molecular chaperones such as Heat shock protein (Hsp) 70 and Hsp40 guide this process (Hartl and Hayer-Hartl, 2009). (plantae.org)
  • G proteins , also known as guanine nucleotide-binding proteins , are a family of proteins that act as molecular switches inside cells, and are involved in transmitting signals from a variety of stimuli outside a cell to its interior. (wikipedia.org)
  • IMSEAR at SEARO: Catechol stimulation of ferricyanide Hill reaction by spheroplasts of cyanobacterium, Synechococcus cedrorum: effect of temperature on catechol-stimulated oxygen evolution. (who.int)
  • Schultes NP, Peterson RB (2007) Phylogeny-directed structural analysis of the Arabidopsis PsbS protein . (ct.gov)
  • A structural ensemble derived from cryo-electron microscopy reveals a cryptic pocket site in intermediate states along the opening pathway of the SARS-CoV-2 spike protein. (rsc.org)
  • The observed rearrangements in the structure of the AA reaction center establish a new balance between charged residues of an interactive network near Q(B). This structurally and electrostatically altered complex forms the basis for future understanding of the structural basis for proton transfer in active reaction centers which retain the alanine substitutions but carry a distant compensatory mutation. (proteopedia.org)
  • These findings expand the structural and mechanistic repertoire of flavoenzymes with oxidoreductase activity and pave the way to explore new protein engineering approaches aimed at designing redox-active proteins for diverse biotechnological applications. (nih.gov)
  • Insight into protein folding and denaturation and in vivo mechanical stretching, thought to play a role in regulating the function of proteins polysaccharides and DNA, will be gained. (concordia.ca)
  • The long-term goal of this research program is to understand the structure and function of the Photosystem I reaction center. (elsevier.com)
  • We will also jointly characterize alternative electron transport pathways involving the Photosystem I reaction center (e.g, cyclic electron transport) and function of the alternative electron acceptors ferredoxin and flavodoxin. (elsevier.com)
  • The first function as monomeric small GTPases (small G-proteins), while the second function as heterotrimeric G protein complexes . (wikipedia.org)
  • Photosynthetic function in relation to gene expression in Zea mays . (ct.gov)