Filamentous proteins that are the main constituent of the thin filaments of muscle fibers. The filaments (known also as filamentous or F-actin) can be dissociated into their globular subunits; each subunit is composed of a single polypeptide 375 amino acids long. This is known as globular or G-actin. In conjunction with MYOSINS, actin is responsible for the contraction and relaxation of muscle.
Encyclopedias as Topic
N-Terminal Acetyltransferase B
An N-terminal acetyltransferase subtype that consists of the Naa20p catalytic subunit and the Naa25p auxiliary subunit. The structure of this enzyme is conserved between YEASTS and HUMAN. It has specificity for the N-terminal METHIONINE of peptides where the next amino acid in the chain is either ASPARTATE; GLUTAMATE; ASPARAGINE; OR GLUTAMINE.
A bibliographic database that includes MEDLINE as its primary subset. It is produced by the National Center for Biotechnology Information (NCBI), part of the NATIONAL LIBRARY OF MEDICINE. PubMed, which is searchable through NLM's Web site, also includes access to additional citations to selected life sciences journals not in MEDLINE, and links to other resources such as the full-text of articles at participating publishers' Web sites, NCBI's molecular biology databases, and PubMed Central.
A phylum of the kingdom Metazoa. Mollusca have soft, unsegmented bodies with an anterior head, a dorsal visceral mass, and a ventral foot. Most are encased in a protective calcareous shell. It includes the classes GASTROPODA; BIVALVIA; CEPHALOPODA; Aplacophora; Scaphopoda; Polyplacophora; and Monoplacophora.
Muscle Fibers, Skeletal
Large, multinucleate single cells, either cylindrical or prismatic in shape, that form the basic unit of SKELETAL MUSCLE. They consist of MYOFIBRILS enclosed within and attached to the SARCOLEMMA. They are derived from the fusion of skeletal myoblasts (MYOBLASTS, SKELETAL) into a syncytium, followed by differentiation.
Unstriated and unstriped muscle, one of the muscles of the internal organs, blood vessels, hair follicles, etc. Contractile elements are elongated, usually spindle-shaped cells with centrally located nuclei. Smooth muscle fibers are bound together into sheets or bundles by reticular fibers and frequently elastic nets are also abundant. (From Stedman, 25th ed)
Prince Edward Island
An island in the Gulf of St. Lawrence constituting a province of Canada in the eastern part of the country. It is very irregular in shape with many deep inlets. Its capital is Charlottetown. Discovered by the French in 1534 and originally named Ile Saint-Jean, it was renamed in 1799 in honor of Prince Edward, fourth son of George III and future father of Queen Victoria. (From Webster's New Geographical Dictionary, 1988, p981 & Room, Brewer's Dictionary of Names, 1992, p433)
A form of CARDIAC MUSCLE disease, characterized by left and/or right ventricular hypertrophy (HYPERTROPHY, LEFT VENTRICULAR; HYPERTROPHY, RIGHT VENTRICULAR), frequent asymmetrical involvement of the HEART SEPTUM, and normal or reduced left ventricular volume. Risk factors include HYPERTENSION; AORTIC STENOSIS; and gene MUTATION; (FAMILIAL HYPERTROPHIC CARDIOMYOPATHY).
Cardiomyopathy, Hypertrophic, Familial
Any member of the class of enzymes that catalyze the cleavage of the substrate and the addition of water to the resulting molecules, e.g., ESTERASES, glycosidases (GLYCOSIDE HYDROLASES), lipases, NUCLEOTIDASES, peptidases (PEPTIDE HYDROLASES), and phosphatases (PHOSPHORIC MONOESTER HYDROLASES). EC 3.
Protein Processing, Post-Translational
Any of various enzymatically catalyzed post-translational modifications of PEPTIDES or PROTEINS in the cell of origin. These modifications include carboxylation; HYDROXYLATION; ACETYLATION; PHOSPHORYLATION; METHYLATION; GLYCOSYLATION; ubiquitination; oxidation; proteolysis; and crosslinking and result in changes in molecular weight and electrophoretic motility.
A diverse superfamily of proteins that function as translocating proteins. They share the common characteristics of being able to bind ACTINS and hydrolyze MgATP. Myosins generally consist of heavy chains which are involved in locomotion, and light chains which are involved in regulation. Within the structure of myosin heavy chain are three domains: the head, the neck and the tail. The head region of the heavy chain contains the actin binding domain and MgATPase domain which provides energy for locomotion. The neck region is involved in binding the light-chains. The tail region provides the anchoring point that maintains the position of the heavy chain. The superfamily of myosins is organized into structural classes based upon the type and arrangement of the subunits they contain.
Enzyme-Linked Immunosorbent Assay
An immunoassay utilizing an antibody labeled with an enzyme marker such as horseradish peroxidase. While either the enzyme or the antibody is bound to an immunosorbent substrate, they both retain their biologic activity; the change in enzyme activity as a result of the enzyme-antibody-antigen reaction is proportional to the concentration of the antigen and can be measured spectrophotometrically or with the naked eye. Many variations of the method have been developed.
Reagent Kits, Diagnostic
Sensitivity and Specificity
A genus of deer, Rangifer, that inhabits the northern parts of Europe, Asia, and America. Caribou is the North American name; reindeer, the European. They are often domesticated and used, especially in Lapland, for drawing sleds and as a source of food. Rangifer is the only genus of the deer family in which both sexes are antlered. Most caribou inhabit arctic tundra and surrounding arboreal coniferous forests and most have seasonal shifts in migration. They are hunted extensively for their meat, skin, antlers, and other parts. (From Webster, 3d ed; Walker's Mammals of the World, 5th ed, p1397)
Donor site competition is involved in the regulation of alternative splicing of the rat beta-tropomyosin pre-mRNA. (1/1370)The rat beta-tropomyosin (beta-TM) gene encodes both skeletal muscle beta-TM mRNA and nonmuscle TM-1 mRNA via alternative RNA splicing. This gene contains eleven exons: exons 1-5, 8, and 9 are common to both mRNAs; exons 6 and 11 are used in fibroblasts as well as in smooth muscle, whereas exons 7 and 10 are used in skeletal muscle. Previously we demonstrated that utilization of the 3' splice site of exon 7 is blocked in nonmuscle cells. In this study, we use both in vitro and in vivo methods to investigate the regulation of the 5' splice site of exon 7 in nonmuscle cells. The 5' splice site of exon 7 is used efficiently in the absence of flanking sequences, but its utilization is suppressed almost completely when the upstream exon 6 and intron 6 are present. The suppression of the 5' splice site of exon 7 does not result from the sequences at the 3' end of intron 6 that block the use of the 3' splice site of exon 7. However, mutating two conserved nucleotides GU at the 5' splice site of exon 6 results in the efficient use of the 5' splice site of exon 7. In addition, a mutation that changes the 5' splice site of exon 7 to the consensus U1 snRNA binding site strongly stimulates the splicing of exon 7 to the downstream common exon 8. Collectively, these studies demonstrate that 5' splice site competition is responsible, in part, for the suppression of exon 7 usage in nonmuscle cells. (+info)
Properties of non-polymerizable tropomyosin obtained by carboxypeptidase A digestion. (2/1370)Tropomyosin digested with carboxypeptidase A [EC 220.127.116.11] (CTM) shows a lower viscosity than the undigested protein in solution. From the relation between the viscosity decrease and the amount of amino acids liberated from the carboxyl terminus during this digestion, it is inferred that loss of the tri-peptide-Thr-Ser-Ile from the C-terminus is responsible for the decrease in viscosity. The secondary structure of -TM was not affected by the digestion according to circular dichroic measurements. The viscosity of CTM did not increase in methanol-water mixtures, whereas that of tropomyosin increased markedly. These results indicate that polymerizability was lost upon the removal of a small peptide from the C-terminus without change in the secondary structure. A decrease in the viscosity of tropomyosin solutions was observed on the addition of CTM, indicating that CTM interacts with intact tropomyosin. The dependence of the viscosity decrease on the amount of CTM showed that CTM binds tropomyosin in a one-to-one ratio as a result of end-to-end interaction. Since paracrystals having a 400 A repeated band structure could be grown in the presence of Mg ions at neutral pH, side-by-side interactions in CTM molecules remain intact, even though polymerizability is lost. The disc gel electrophoretic pattern showed that troponin could bind to CTM, but no increase in viscosity due to the complex was observed in solution. That is, the C-terminal part of tropomyosin is not required for the formation of the complex. The amount of CTM bound to F-actin was less than half of that bound to undigested tropomyosin, and could be reduced to one-tenth by a washing procedure. In the presence of troponin, however, the amount recovered to the level of tropomyosin normally bound to F-actin. Therefore, it is concluded that troponin is bound in the middle of the tropomyosin molecule and strengthens the binding of tropomyosin to F-actin. (+info)
Roles for the troponin tail domain in thin filament assembly and regulation. A deletional study of cardiac troponin T. (3/1370)Striated muscle contraction is regulated by Ca2+ binding to troponin, which has a globular domain and an elongated tail attributable to the NH2-terminal portion of the bovine cardiac troponin T (TnT) subunit. Truncation of the bovine cardiac troponin tail was investigated using recombinant TnT fragments and subunits TnI and TnC. Progressive truncation of the troponin tail caused progressively weaker binding of troponin-tropomyosin to actin and of troponin to actin-tropomyosin. A sharp drop-off in affinity occurred with NH2-terminal deletion of 119 rather than 94 residues. Deletion of 94 residues had no effect on Ca2+-activation of the myosin subfragment 1-thin filament MgATPase rate and did not eliminate cooperative effects of Ca2+ binding. Troponin tail peptide TnT1-153 strongly promoted tropomyosin binding to actin in the absence of TnI or TnC. The results show that the anchoring function of the troponin tail involves interactions with actin as well as with tropomyosin and has comparable importance in the presence or absence of Ca2+. Residues 95-153 are particularly important for anchoring, and residues 95-119 are crucial for function or local folding. Because striated muscle regulation involves switching among the conformational states of the thin filament, regulatory significance for the troponin tail may arise from its prominent contribution to the protein-protein interactions within these conformations. (+info)
Binding of hnRNP H to an exonic splicing silencer is involved in the regulation of alternative splicing of the rat beta-tropomyosin gene. (4/1370)In the rat beta-tropomyosin (beta-TM) gene, exons 6 and 7 are spliced alternatively in a mutually exclusive manner. Exon 6 is included in mRNA encoding nonmuscle TM-1, whereas exon 7 is used in mRNA encoding skeletal muscle beta-TM. Previously, we demonstrated that a six nucleotide mutation at the 5' end of exon 7, designated as ex-1, activated exon 7 splicing in nonmuscle cells. In this study, we show that the activating effect of this mutation is not the result of creating an exonic splicing enhancer (ESE) or disrupting a putative secondary structure. The sequence in exon 7 acts as a bona fide exonic splicing silencer (ESS), which is bound specifically by a trans-acting factor. Isolation and peptide sequencing reveal that this factor is hnRNP H, a member of the heterogeneous nuclear ribonucleoprotein (hnRNP) family. Binding of hnRNP H correlates with the ESS activity. Furthermore, addition of antibodies that specifically recognizes hnRNP H to the splicing reactions or partial depletion of hnRNP H from nuclear extract activates exon 7 splicing in vitro and this effect can be reversed by addition of purified recombinant hnRNP H. These results indicate that hnRNP H participates in exclusion of exon 7 in nonmuscle cells. The involvement of hnRNP H in the activity of an ESS may represent a prototype for the regulation of tissue- and developmental-specific alternative splicing. (+info)
Amphidinolide B, a powerful activator of actomyosin ATPase enhances skeletal muscle contraction. (5/1370)Amphidinolide B caused a concentration-dependent increase in the contractile force of skeletal muscle skinned fibers. The concentration-contractile response curve for external Ca2+ was shifted to the left in a parallel manner, suggesting an increase in Ca2+ sensitivity. Amphidinolide B stimulated the superprecipitation of natural actomyosin. The maximum response of natural actomyosin to Ca2+ in superprecipitation was enhanced by it. Amphidinolide B increased the ATPase activity of myofibrils and natural actomyosin. The ATPase activity of actomyosin reconstituted from actin and myosin was enhanced in a concentration-dependent manner in the presence or absence of troponin-tropomyosin complex. Ca2+-, K+-EDTA- or Mg2+-ATPase of myosin was not affected by amphidinolide B. These results suggest that amphidinolide B enhances an interaction of actin and myosin directly and increases Ca2+ sensitivity of the contractile apparatus mediated through troponin-tropomyosin system, resulting in an increase in the ATPase activity of actomyosin and thus enhances the contractile response of myofilament. (+info)
Aldolase binding to actin-containing filaments. Formation of paracrystals. (6/1370)Electron-microscopy observation show that when aldolase binds to F-actin or F-actin-tropomyosin, highly ordered paracrystalline structures are formed consisting of tightly packed filament bundles cross-banded at 36 nm intervals. Morphologically different paracrystalline arrays are formed between aldolase and F-actin-tropomyosin-troponin. The filament bundles are far more extensive and are characterized by a prominent cross-striation at 38nm intervals. It is suggested that this reflects an interaction between troponin and aldolase. (+info)
Exonic splicing enhancers contribute to the use of both 3' and 5' splice site usage of rat beta-tropomyosin pre-mRNA. (7/1370)The rat beta-tropomyosin gene encodes two tissue-specific isoforms that contain the internal, mutually exclusive exons 6 (nonmuscle/smooth muscle) and 7 (skeletal muscle). We previously demonstrated that the 3' splice site of exon 6 can be activated by introducing a 9-nt polyuridine tract at its 3' splice site, or by strengthening the 5' splice site to a U1 consensus binding site, or by joining exon 6 to the downstream common exon 8. Examination of sequences within exons 6 and 8 revealed the presence of two purine-rich motifs in exon 6 and three purine-rich motifs in exon 8 that could potentially represent exonic splicing enhancers (ESEs). In this report we carried out substitution mutagenesis of these elements and show that some of them play a critical role in the splice site usage of exon 6 in vitro and in vivo. Using UV crosslinking, we have identified SF2/ASF as one of the cellular factors that binds to these motifs. Furthermore, we show that substrates that have mutated ESEs are blocked prior to A-complex formation, supporting a role for SF2/ASF binding to the ESEs during the commitment step in splicing. Using pre-mRNA substrates containing exons 5 through 8, we show that the ESEs within exon 6 also play a role in cooperation between the 3' and 5' splice sites flanking this exon. The splicing of exon 6 to 8 (i.e., 5' splice site usage of exon 6) was enhanced with pre-mRNAs containing either the polyuridine tract in the 3' splice site or consensus sequence in the 5' splice site around exon 6. We show that the ESEs in exon 6 are required for this effect. However, the ESEs are not required when both the polyuridine and consensus splice site sequences around exon 6 were present in the same pre-mRNA. These results support and extend the exon-definition hypothesis and demonstrate that sequences at the 3' splice site can facilitate use of a downstream 5' splice site. In addition, the data support the hypothesis that ESEs can compensate for weak splice sites, such as those found in alternatively spliced exons, thereby providing a target for regulation. (+info)
Regulatory protein of vascular smooth muscle. (8/1370)Preparations of native tropomyosin from the muscles of bovine aorta and carotid artery resensitized myosin B from either tissue. Neither preparation had any effect on desensitized myosin B from skeletal muscle but native tropomyosin from skeletal muscle could resensitize desensitized myosin B from vascular smooth muscles. (+info)
Tropomyosin is a rod-shaped molecule composed of two intertwined polypeptides with a length approximately equal to that of seven actin molecules. Chains of tropomyosin molecules are arranged end to end along the actin thin filament. These tropomyosin molecules partially cover the myosin-binding site on each actin molecule, thereby preventing the cross-bridges from making contact with actin. Each tropomyosin molecule is held in this blocking position by troponin, a smaller, globular protein that is bound to both tropomyosin and actin. One molecule of troponin binds to each molecule of tropomyosin and regulates the access to myosin-binding sites on the seven actin molecules in contact with tropomyosin. This is the status of a resting muscle fiber; troponin and tropomyosin cooperatively block the interaction of cross-bridges with the thin filament. ...
Differential regulation of tropomyosin isoform organization and gene expression in response to altered actin gene expression. |...
Phenotypically altered C2 myoblast cells, generated by the stable transfection of human nonmuscle actin genes (Schevzov, G., C. Lloyd, and P. Gunning. 1992. J. Cell Biol. 117:775-786), exhibit a differential pattern of tropomyosin cellular organization and isoform gene expression. The beta-actin transfectants displaying a threefold increase in the cell surface area, showed no significant changes in the pattern of organization of the high M(r) tropomyosin isoform, Tm 2, or the low M(r) tropomyosin isoform, Tm 5. In contrast, the gamma- and beta sm-actin gene transfectants, exhibiting a twofold decrease in the cell surface area, had an altered organization of Tm 2 but not Tm 5. In these actin transfectants, Tm 2 did not preferentially segregate into stress fiber-like structures and the intensity of staining was greatly diminished. Conversely, a well-defined stress fiber-like organization of Tm 5 was observed. The pattern of organization of these tropomyosin isoforms correlated with their ...
Tropomyosin - Wikipedia
Tropomyosin is a two-stranded alpha-helical coiled coil protein found in cell cytoskeletons. All organisms contain structures that provide physical integrity to their cells. These structures are collectively known as the cytoskeleton, and one of the most ancient systems is based on filamentous polymers of the protein actin. A second polymer of the protein, tropomyosin, is an integral part of most actin filaments in animals. Tropomyosins are a large family of integral components of actin filaments that play a critical role in regulating the function of actin filaments in both muscle and nonmuscle cells. These proteins consist of rod-shaped coiled-coil hetero- or homo-dimers that lie along the α-helical groove of most actin filaments. Interaction occurs along the length of the actin filament, with dimers aligning in a head-to-tail fashion. Tropomyosins are often categorised into two groups, muscle tropomyosin isoforms and nonmuscle tropomyosin isoforms. Muscle tropomyosin isoforms are involved in ...
AID 590850 - Binding affinity to chicken skeletal muscle tropomyosin within actomyosin protein complex at 125 uM after 1 hr...
BioAssay record AID 590850 submitted by ChEMBL: Binding affinity to chicken skeletal muscle tropomyosin within actomyosin protein complex at 125 uM after 1 hr followed by 10 mins irradiation with UVA by SDS-PAGE analysis using coomassie brilliant blue staining.
Homozygosity for a nonsense mutation in the alpha-tropomyosin gene TPM3 in a patient with severe nemaline myopathy - Murdoch...
1997) Homozygosity for a nonsense mutation in the alpha-tropomyosin gene TPM3 in a patient with severe nemaline myopathy. Neuromuscular Disorders, 7 (6-7). pp. 427-428. ...
Subtractive cDNA cloning as a tool to analyse secondary effects of a muscle disease. Characterization of affected genes in the...
In myotonic ADR mice that are homozygous for a defect in the muscular chloride channel gene adr/Clc-1, the hyperexcitability of fast muscles is associated with secondary changes in gene expression and fibre type composition, cDNA clones derived from a set of genes down regulated in fast muscles of the myotonic ADR mouse were isolated by a subtractive cloning procedure. A total of 1200 clones were analysed for high expression in fast muscle of wild type and low expression in mutant mouse. Differential transcript levels were verified by northern blot hybridizations. The identities of the corresponding transcripts were determined by sequencing as myosin heavy chain IIB, alpha-tropomyosin, troponin C, a Ca2+ ATPase and parvalbumin mRNAs. Of these, mRNAs for parvalbumin and myosin heavy chain IIB were drastically downregulated in myotonic muscle (to < 10% of control). A full length cDNA clone for skeletal muscle alpha-tropomyosin was homologous to the mouse fibroblast tropomyosin isoform 2, except ...
Determination of the native subunit pattern of gizzard tropomyosin using antibodies specific to each subunit1
The gizzard tropomyosin molecule is composed of two subunits at 1:1 molar ratio. Best chicken marinades for grilling Possible composites of the tropomyosin
The Sydney eScholarship Repository: Tropomyosin Regulates Cell Migration during Skin Wound Healing
Precise orchestration of actin polymer into filaments with distinct characteristics of stability, bundling, and branching underpins cell migration. A key regulator of actin filament specialization is the tropomyosin family of actin-associating proteins. This multi-isoform family of proteins assemble into polymers that lie in the major groove of polymerized actin filaments, which in turn determine the association of molecules that control actin filament organization. This suggests that tropomyosins may be important regulators of actin function during physiological processes dependent on cell migration, such as wound healing. We have therefore analyzed the requirement for tropomyosin isoform expression in a mouse model of cutaneous wound healing. We find that mice in which the 9D exon from the TPM3/γTm tropomyosin gene is deleted (γ9D -/-) exhibit a more rapid wound-healing response 7 days after wounding compared with wild-type mice. Accelerated wound healing was not associated with increased ...
A De Novo Mutation in α-Tropomyosin That Causes Hypertrophic Cardiomyopathy | Circulation
We have demonstrated by haplotype analysis that individual II-3 passed a normal copy of the α-tropomyosin gene to an unaffected child (III-4) and, on the same segment of chromosome 15, a mutated copy to another son (III-2), who developed hypertrophic cardiomyopathy. This observation demonstrates that a de novo α-tropomyosin gene mutation, Asp175Asn, occurred in individual III-2, who has hypertrophic cardiomyopathy (Fig 1A⇑). This finding shows conclusively that this mutation alone is sufficient to cause the disease and excludes the possibility that another abnormality in this or a linked gene is responsible. The Asp175Asn mutation in the α-tropomyosin gene of individual III-2 was present in three different tissues: cardiac myocytes, lymphocytes, and gametes. This suggests that the mutation arose either in development of the gamete (ie, during spermatogenesis in the father, II-3) or very early in embryonic development. We cannot determine whether the probands father (individual II-3) ...
Thermal unfolding of smooth muscle and nonmuscle tropomyosin alpha-homodimers with alternatively spliced exons - Kent Academic...
We used differential scanning calorimetry (DSC) and circular dichroism (CD) to investigate thermal unfolding of recombinant fibroblast isoforms of alpha-tropomyosin (Tm) in comparison with that of smooth muscle Tm. These two nonmuscle Tm isoforms 5a and 5b differ internally only by exons 6b/6a, and they both differ from smooth muscle Tm by the N-terminal exon 1b which replaces the muscle-specific exons 1a and 2a. We show that the presence of exon 1b dramatically decreases the measurable calorimetric enthalpy of the thermal unfolding of Tm observed with DSC, although it has no influence on the alpha-helix content of Tm or on the end-to-end interaction between Tm dimers. The results suggest that a significant part of the molecule of fibroblast Tm (but not smooth muscle Tm) unfolds noncooperatively, with the enthalpy no longer visible in the cooperative thermal transitions measured. On the other hand, both DSC and CD studies show that replacement of muscle exons 1a and 2a by nonmuscle exon 1b not ...
Brain-specific tropomyosins TMBr-1 and TMBr-3 have distinct patterns of expression during development and in adult brain -...
In this study we report on the developmental and regional expression of two brain-specific isoforms of tropomyosin, TMBr-1 and TMBr-3, that are generated from the rat alpha-tropomyosin gene via the use of alternative promoters and alternative RNA splicing. Western blot analysis using an exon-specific peptide polyclonal antibody revealed that the two isoforms are differentially expressed in development with TMBr-3 appearing in the embryonic brain at 16 days of gestation, followed by the expression of TMBr-1 at 20 days after birth. TMBr-3 was detected in all brain regions examined, whereas TMBr-1 was detected predominantly in brain areas that derived from the prosencephalon. Immunocytochemical studies on mixed primary cultures made from rat embryonic midbrain indicate that expression of the brain-specific epitope is restricted to neurons. The developmental pattern and neuronal localization of these forms of tropomyosin suggest that these isoforms have a specialized role in the development and ...
tropomyosin - oi
A protein found in the actin filaments in muscles. The molecule consists of two elongated strands that run along the length of the filament. When the muscle is at rest, the tropomyosin molecule covers the binding site of the actin molecule, where interaction with myosin occurs. On contraction of the muscle, the tropomyosin is displaced by another protein, troponin, allowing the interaction of actin with myosin. See sliding filament theory. ...
Interaction of aldolase with the troponin-tropomyosin complex of bovine muscle | Biochemical Journal
Ultracentrifugal studies of mixtures of aldolase and the troponin-tropomyosin complex from bovine muscle showed the existence of a labile interaction between these two myofibrillar constituents in imidazole buffers, pH6.8, I 0.02-0.10 (mol/l), and the suppression of the reaction by fructose 1,6-diphosphate. Analysis of the sedimentation-velocity patterns suggests the binding of more than 2 molecules of troponin-tropomyosin/molecule of aldolase. The results illustrate the necessity of considering additional or alternative sites to F-actin to account for the observed binding of aldolase to the thin filaments of skeletal muscle.. ...
News - FOR2333 Research Unit
In this study, the Ephrussi lab shows that an atypical tropomyosin isoform is a direct (m)RNA binding protein that binds preferentially to the dimerizing oskar 3 UTR and is a component of the transported oskar mRNPs within the female germ-line. In the absence of this tropomyosin isoform, Khc fails to get loaded onto oskar mRNA, which explains the reduced motility and ultimately the failure in oskar localization. This Tm1-I/C dependent recruitment is rather inefficient - only a small fraction of oskar mRNPs acquire Khc - but dynamic, enabling the posterior-ward transport of virtually all oskar mRNPs. Most importantly, however, the Tm1-I/C recruited Khc is inactive. Activation of the motor only commences in the oocyte during mid-oogenesis - possibly to prevent interference with the other transporter of oskar, cytoplasmic dynein - and requires the previously identified exon junction complex (EJC) and associated spliced oskar localization element (SOLE).. Gaspar, I., Sysoev, V., Komissarov, A. and ...
Changes in end-to-end interactions of tropomyosin affect mouse cardiac muscle dynamics<...
TY - JOUR. T1 - Changes in end-to-end interactions of tropomyosin affect mouse cardiac muscle dynamics. AU - Gaffin, Robert D.. AU - Gokulan, Kuppan. AU - Sacchettini, James C.. AU - Hewett, Timothy E.. AU - Klevitsky, Raisa. AU - Robbins, Jeffrey. AU - Sarin, Vandana. AU - Zawieja, David C.. AU - Meininger, Gerald A.. AU - Muthuchamy, Mariappan. PY - 2006. Y1 - 2006. N2 - The ends of striated muscle tropomyosin (TM) are integral for thin filament cooperativity, determining the cooperative unit size and regulating the affinity of TM for actin. We hypothesized that altering the α-TM carboxy terminal overlap end to the β-TM counterpart would affect the amino-terminal association, which would alter the end-to-end interactions of TM molecules in the thin filament regulatory strand and affect the mechanisms of cardiac muscle contraction. To test this hypothesis, we generated transgenic (TG) mouse lines that express a mutant form of α-TM in which the first 275 residues are from α-TM and the last ...
Localization of myosin, actin, alpha-actinin, tropomyosin and vinculin in surface-activated, spreading human platelets. -...
We observed the localization of the contractile proteins myosin, filamentous actin, alpha-actinin, tropomyosin, and vinculin in surface-activated, spreading human platelets using a single fluorescence staining procedure and conventional fluorescence microscopy. Myosin was distributed in a speckled pattern that extended radially from the granulomere. F-actin demonstrated cable-networks. Tropomyosin and alpha-actinin occurred in a punctuate distribution, and vinculin was localized at adhesion sites. Although myosin, F-actin, alpha-actinin, tropomyosin, and vinculin were not studied in resting platelets, our data support the idea that these contractile proteins are reorganized and reassembled in activated platelets during platelet function.
Elevated tropomyosin expression is associated with epithelial-mesenchymal transition of lens epithelial cells - Kubo - 2012 -...
Injury to lens epithelial cells (LECs) leads to epithelial-mesenchymal transition (EMT) with resultant fibrosis. The tropomyosin (Tpm) family of cytoskeleton proteins is involved in regulating and stabilizing actin microfilaments. Aberrant expression of Tpms leads to abnormal morphological changes with disintegration of epithelial integrity. The EMT of LECs has been proposed as a major cause of posterior capsule opacification (PCO) after cataract surgery. Using in vivo rodent PCO and human cataractous LECs, we demonstrated that the aberrant expression of rat Tpm and human Tpm1α/2β suggested their association in remodelling of the actin cytoskeleton during EMT of LECs. Expression analysis from abnormally growing LECs after lens extraction revealed elevated expression of α-smooth muscle actin (α-SMA), a marker for EMT. Importantly, these cells displayed increased expression of Tpm1α/2β following EMT/PCO formation. Expression of Tpm1α/2β was up-regulated in LECs isolated from cataractous ...
HKU Scholars Hub: Screening and identification of mimotopes of the major shrimp allergen tropomyosin using one-bead-one...
The one-bead-one-compound (OBOC) combinatorial peptide library is a powerful tool to identify ligand and receptor interactions. Here, we applied the OBOC library technology to identify mimotopes specific to the immunoglobulin E (IgE) epitopes of the major shellfish allergen tropomyosin. OBOC peptide libraries with 8-12 amino acid residues were screened with serum samples from patients with shellfish allergy for IgE mimotopes of tropomyosin. Twenty-five mimotopes were identified from the screening and their binding reactivity to tropomyosin-specific IgE was confirmed by peptide ELISA. These mimotopes could be divided into seven clusters based on sequence homology, and epitope mapping by EpiSearch of the clustered mimotopes was performed to characterize and confirm the validity of mimotopes. Five out of six of the predicted epitopes were found to overlap with previously identified epitopes of tropomyosin. To further confirm the mimicry potential of mimotopes, BALB/c mice were immunized with ...
User:Z3367632 - CellBiology
Part A 1.) What are the changes in phenotypes that you observe between group A and group B? In group A, in which Tropomyosin 4 was over-expressed, the stringed phenotype was the most common among the cells observed. In the control group (group B) the pronged phenotype was the most common. 2.) How does Tm4 mediate these changes? Tm4 mediates these changes due to its effect on actin filaments within the cells. Tropomyosin, of which Tm4 is an isoform, is a protein that binds to actin filaments and promotes their stability. Actin filaments are important structural components of neurites, which are projections of the cell body of the neuron.  Due to the overexpression of the tropomyosin isoform in group A the higher percentage of cells with the stringed phenotype makes sense. The greater expression of tropomyosin means that there is a higher level of stabilized actin filaments, which would explain the presence of more cells with long neurites than the control group. The lower levels of ...
Mutation-Specific Phenotypes in hiPSC-Derived Cardiomyocytes Carrying Either Myosin-Binding Protein C Or α-Tropomyosin Mutation...
Hypertrophic cardiomyopathy (HCM) is a genetic cardiac disease, which affects the structure of heart muscle tissue. The clinical symptoms include arrhythmias, progressive heart failure, and even sudden cardiac death but the mutation carrier can also be totally asymptomatic. To date, over 1400 mutations have been linked to HCM, mostly in genes encoding for sarcomeric proteins. However, the pathophysiological mechanisms of the disease are still largely unknown. Two founder mutations for HCM in Finland are located in myosin-binding protein C (MYBPC3-Gln1061X) and α-tropomyosin (TPM1-Asp175Asn) genes. We studied the properties of HCM cardiomyocytes (CMs) derived from patient-specific human induced pluripotent stem cells (hiPSCs) carrying either MYBPC3-Gln1061X or TPM1-Asp175Asn mutation. Both types of HCM-CMs displayed pathological phenotype of HCM but, more importantly, we found differences between CMs carrying either MYBPC3-Gln1061X or TPM1-Asp175Asn gene mutation in their cellular size, Ca2+ ...
Effects of cardiomyopathy-linked mutations K15N and R21H in tropomyosin on thin-filament regulation and pointed-end dynamics -...
Fingerprint Dive into the research topics of Effects of cardiomyopathy-linked mutations K15N and R21H in tropomyosin on thin-filament regulation and pointed-end dynamics. Together they form a unique fingerprint. ...
Tropomyosin alpha-4 chain
This gene encodes a member of the tropomyosin family of actin-binding proteins involved in the contractile system of striated and smooth muscles and the cytoskeleton of non-muscle cells. Tropomyosins are dimers of coiled-coil proteins that polymerize end-to-end along the major groove in most actin filaments. They provide stability to the filaments and regulate access of other actin-binding proteins. In muscle cells, they regulate muscle contraction by controlling the binding of myosin heads to the actin filament. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Nov 2009 ...
Difference between revisions of 2013 Lab 6 - CellBiology
The actin microfilaments are composed of a two stranded polymer of actin and most filaments also contain polymers of the rod shaped tropomyosin running along the major groove in the filament. As you heard in the lecture on Microfilaments, the different tropomyosin isoforms have the ability to direct the assembly of specific cellular structures. Previous experiments have been performed in which the neuroblastoma derived cell line, B35 (Schubert D, etal., 1974) is given a gene construct driving the expression of a specific tropomyosin. Cells are then isolated which express the introduced tropomyosin and analysed for changes in phenotype. ...
Tropomyosin isoforms in rat neurons: the different developmental profiles and distributions of TM-4 and TMBr-3 are consistent...
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C-Terminal Truncation of Cardiac Troponin I Causes Divergent Effects on ATPase and Force | Circulation Research
The data are considered in the context of prominent three-state models of thin-filament regulation. In the biochemical three-state model, advanced by McKillop and Geeves15 and refined by Geeves and Lehrer,33 tropomyosin can exist in equilibrium between three states. In the absence of Ca2+, troponin stabilizes tropomyosin in a state that blocks myosin binding to actin (blocked state). In the presence of Ca2+, the equilibrium shifts and tropomyosin adopts a state that allows myosin to bind strongly to actin (closed state). In the presence of myosin, equilibrium shifts yet again and tropomyosin adopts a state that permits myosin to bind actin, hydrolyze ATP, and cooperatively propagate further binding of myosin to actin (open state). Vibert and colleagues32 have proposed a structural three-state model in which the Ca2+-free troponin constrains tropomyosin in a position on the inner edge of the outer domain of actin that sterically occludes myosin-binding sites (EGTA state). In the presence of Ca2+, ...
Functional Homodimers and Heterodimers of Recombinant Smooth Muscle Tropomyosin †
Structural analysis of smooth muscle tropomyosin α and β isoforms. | Sigma-Aldrich
Sigma-Aldrich offers abstracts and full-text articles by [Jampani Nageswara Rao, Roland Rivera-Santiago, Xiaochuan Edward Li, William Lehman, Roberto Dominguez].
Spontaneous transitions of actin-bound tropomyosin toward blocked and closed states | Journal of General Physiology |...
Although cryo-EM reconstruction is currently the method of choice to resolve macromolecular structure and is optimal for defining troponin-tropomyosin structure and position on actin filaments in specific thin filament end states, it does not readily capture dynamics about those states or transitions between states. Moreover, blotting thin filament samples into thin films before freezing may distort actin-tropomyosin mechanics (Galkin et al., 2012), and in addition, minimal hydration ensuing at or near the air-water interface during preparation (Noble et al., 2018a,b) may distort weak and transient interaction pathways on the actin surface. As an alternative, we therefore have begun to extend understanding beyond high-resolution 3-D EM, by using MD to determine potential energetically favorable pathways between thin filament regulatory states. We had to overcome a number of technical drawbacks inherent to current MD protocols. Most significantly, the size of the actin-tropomyosin complex and the ...
Items where Subject is bioinformatics | genomics and proteomics | genetics & nucleic acid processing | DNA, RNA structure,...
Chen, C. D., Kobayashi, R., Helfman, D. M. (1999) Binding of hnRNP H to an exonic splicing silencer is involved in the regulation of alternative splicing of the rat beta-tropomyosin gene. Genes and Development, 13 (5). pp. 593-606. ISSN 0890-9369 (Print) Chio, I. I. C., Jafarnejad, S. M., Ponz-Sarvise, M., Park, Y., Rivera, K., Palm, W., Ohlund, D., Hammell, M., Crawford, H., Schmidt, E., Thompson, C., Pappin, D., Sonenberg, N., Tuveson, D. (2017) NRF2 promotes tumor maintenance by modulating mRNA translation in pancreatic cancer. Cancer Research, 77 (Supple). ISSN 0008-54721538-7445 Chio, Iok In Christine, Jafarnejad, Seyed Mehdi, Ponz-Sarvise, Mariano, Park, Youngkyu, Rivera, Keith, Palm, Wilhelm, Wilson, John, Sangar, Vineet, Hao, Yuan, Öhlund, Daniel, Wright, Kevin, Filippini, Dea, Lee, Eun Jung, Da Silva, Brandon, Schoepfer, Christina, Wilkinson, John Erby, Buscaglia, Jonathan M, DeNicola, Gina M, Tiriac, Herve, Hammell, Molly, Crawford, Howard C, Schmidt, Edward E, Thompson, Craig B, ...
The formation of a neuronal network depends on the proper development and targeting of neurons within the network. Here, we show that Psidin, in a similar manner to its recently described role in oocyte migration, acts as a constituent part of the actin machinery in the context of neuronal circuit formation in vivo. Furthermore, it functionally links to known actin regulators, in particular LimK and nonmuscle Tropomyosin. In addition, we define a novel role of Psidin in cell survival of neurons during development. Our data strongly suggest that Psidin uses two modes of activity. First, it prevents apoptosis of developing olfactory neurons as a noncatalytic subunit of the NatB complex. Second, it regulates axon targeting via its interaction with cytoskeleton regulators. Regarding the first role as part of the NatB complex, our results prove an evolutionarily conserved role of Psidin that has been predicted so far merely on the basis of in silico comparisons (see below) (Brennan et al., ...
Tropomyosin Summary Report | CureHunter
Tropomyosin: A protein found in the thin filaments of muscle fibers. It inhibits contraction of the muscle unless its position is modified by TROPONIN.
Troponin and tropomyosin. | Master Of Medicine
Calcium is released from SR in response to action potential and it binds to troponin C and causes conformational change in Troponin-Tropomyosin -Actin unit, myosin binding sites become uncovered leading to muscle contraction.. ...
Tropomyosin 1 genetically constrains in vitro hematopoiesis | BMC Biology | Full Text
Identifying causal variants and genes from human genetic studies of hematopoietic traits is important to enumerate basic regulatory mechanisms underlying these traits, and could ultimately augment translational efforts to generate platelets and/or red blood cells in vitro. To identify putative causal genes from these data, we performed computational modeling using available genome-wide association datasets for platelet and red blood cell traits. Our model identified a joint collection of genomic features enriched at established trait associations and plausible candidate variants. Additional studies associating variation at these loci with change in gene expression highlighted Tropomyosin 1 (TPM1) among our top-ranked candidate genes. CRISPR/Cas9-mediated TPM1 knockout in human induced pluripotent stem cells (iPSCs) enhanced hematopoietic progenitor development, increasing total megakaryocyte and erythroid cell yields. Our findings may help explain human genetic associations and identify a novel genetic
ReP USP - Detalhe do registro: Purification of native shrimp tropomyosin by affinity chromatography with cross-reactive antibody
WÜNSCHMANN, S.; UCHIDA, M.; LEHRER, S. B.; ARRUDA, Luisa Karla de Paula; CHAPMAN, M. D. Purification of native shrimp tropomyosin by affinity chromatography with cross-reactive antibody. Journal of Allergy and Clinical Immunology[S.l: s.n.], 2010 ...
Gentaur Molecular :Abfron \ anti-Tropomyosin, Mouse monoclonal to Tropomyosin, Isotype IgG1 \ LF-MA41491
Gentaur molecular products has all kinds of products like :search , Abfron \ anti-Tropomyosin, Mouse monoclonal to Tropomyosin, Isotype IgG1 \ LF-MA41491 for more molecular products just contact us
Actin- and myosin-binding protein implicated in the regulation of actomyosin interactions in smooth muscle and nonmuscle cells (could act as a bridge between myosin and actin filaments). Stimulates actin binding of tropomyosin which increases the stabilization of actin filament structure. In muscle tissues, inhibits the actomyosin ATPase by binding to F-actin. This inhibition is attenuated by calcium-calmodulin and is potentiated by tropomyosin. Interacts with actin, myosin, two molecules of tropomyosin and with calmodulin. Also play an essential role during cellular mitosis and receptor capping. Involved in Schwann cell migration during peripheral nerve regeneration (By similarity ...
Biology-Online • View topic - Muscle Contractions
The myosin fibers (on actin) are blocked by tropomyosin which is anchored by troponin. Ca2+ binds to troponin causing a conformational change thus moving tropomyosin allowing the myosin binding site to become open. These binding sites form a cross bridge with actin with the help of ADP/Pi. The release of this ADP and phosphate powers a stroke between the myosin and actin filaments causing a pass of the long to shortened sacromere. ADP is released and a new ATP binds to myosin, detacing (relaxing) myosin for next stroke. When ATP is converted to ADP/Pi, another stroke occurs and the cycle repeats until Ca2+ or ATP runs out ...
Cardiac muscle regulatory units are predicted to interact stronger than neighboring cross-bridges
Strong interactions between cross-bridges (XB) and regulatory units (RU) lead to a steep response of cardiac muscle to an increase in intracellular calcium. We developed a model to quantitatively assess the influence of different types of interactions within the sarcomere on the properties of cardiac muscle. In the model, the ensembles consisting of cross-bridge groups connected by elastic tropomyosin are introduced, and their dynamics is described by a set of partial differential equations. Through large scans in the free energy landscape, we demonstrate the different influence of RU-RU, XB-XB, and XB-RU interactions on the cooperativity coefficient of calcium binding, developed maximal force, and calcium sensitivity. The model solution was fitted to reproduce experimental data on force development during isometric contraction, shortening in physiological contraction, and ATP consumption by acto-myosin. On the basis of the fits, we quantified the free energy change introduced through RU-RU and ...
Creating your force regulatory model - UT-Heart XB Modeler
You will construct three models in this chapter. These models are provided as sample models with model names tutorial Ca-F regulatory, tutorial SL dependent(0) and tutorial SL dependent(1).. Here you will include the force regulatory unit which responds to the calcium ion concentration [Ca2+] in its force generation. The actin filament is divided into segments which are referred as to the T/T units. Here the first and second Ts represent the troponin and tropomyosin, respectively. The arrangement of the tropomyosin is controlled by the troponin that reacts with calcium ions and changes the configuration of tropomyosin to expose the biding sites. Here you will create the sarcomere model shown below by starting from the sample model tutorial energy aware MH-3.. ...
Site-Specific Mutations in the Myosin Binding Sites of Actin Affect Structural Transitions That Control Myosin Binding †
Tpm3 - Tropomyosin alpha-3 chain - Rattus norvegicus (Rat) - Tpm3 gene & protein
Binds to actin filaments in muscle and non-muscle cells. Plays a central role, in association with the troponin complex, in the calcium dependent regulation of vertebrate striated muscle contraction. Smooth muscle contraction is regulated by interaction with caldesmon. In non-muscle cells is implicated in stabilizing cytoskeleton actin filaments.
Calcium Pumps - Stock Video Clip K005/0663 - Science Photo Library
Calcium pumps transport calcium back into sarcoplasmic reticulum, ending an action potential and causing relaxation. The process of muscle contraction will continue until the action potential is terminated. Relaxation is achieved when calcium pumps have actively transported calcium back into the sarcoplasmic reticulum, reversing the changes that previously occurred in troponin. Tropomyosin is now back in its original position covering the myosin binding sites on actin, preventing crossbridges and power stroke cycling. - Stock Video Clip K005/0663
Miscellaneous Glutamate - NF-κB signaling in inflammation and cancer
Supplementary MaterialsAdditional file 1: Amount S1. analysis. Desk S2. Individual 15-LOX1 gene methylation level in Wager1A and NCI-H23 cells treated by PM2.5 and NNK. (DOCX 8597 kb) 13046_2019_1380_MOESM1_ESM.docx (8.3M) GUID:?E4D45034-F009-4058-81B1-2C06D29B3D25 Data Availability StatementAll relevant data are contained in the paper and its own supplementary information files. Abstract History Epidemiological observations possess showed that ambient great […]. Read More ». ...
HumanPhysiology2011 - 11. Muscule Physiology
When you contract a muscle, you are shortening sarcomeres that slide between two filaments, one thick and one thin. The sliding is produced by cross bridges that come out from both the myosin and actin. Myosine heads are located on each end of a sarcomere which pulls actin towards the center. The myosine heads split up ATP into ADP and P. After the myosine heads attach to a actin protien it forms a cross bridge causing dephosphorylated making a change in the myosin creating a power stroke. This adds to the force pulling the thin filament towards the center. More cross bridges are made to make the force stronger. Attached to actin is a protein called tropomyosin which then has a protein called tropinin attached to it. They are the switch that controls wheather the muscle is going to contract or relax. In order to relax, tropomyosin has to be removed and it can only be removed by tropinin and Ca2+ working together. Each muscle cells contains a cytoplasm which in turn contains the sarcoplasm. The ...
Structural Kinetics of Thin Filament Regulation at Single Molecule Level - Wen-Ji Dong
Heart failure results from impaired activation or deactivation of the heart at the level of the myofilament. Current dogma suggests that cardiac muscle contract...
What blocks active sites on the actin when a muscle is at rest? | Reference.com
According to the University of New Mexico, regulatory proteins known as troponin and tropomyosin form a complex and block the active sites on actin molecules. The troponin tropomyosin complex...
Mechanisms of thin filament assembly in embryonic chick cardiac myocytes: Tropomodulin requires tropomyosin for assembly<...
TY - JOUR. T1 - Mechanisms of thin filament assembly in embryonic chick cardiac myocytes. T2 - Tropomodulin requires tropomyosin for assembly. AU - Gregorio, Carol. AU - Fowler, V. M.. PY - 1995. Y1 - 1995. N2 - Tropomodulin is a pointed end capping protein for tropomyosin-coated actin filaments that is hypothesized to play a role in regulating the precise lengths of striated muscle thin filaments (Fowler, V. M., M. A. Sussman, P. G. Miller, B. E. Flucher, and M. P. Daniels. 1993. J. Cell Biol. 120:411- 420; Weber, A., C. C. Pennise, G. G. Babcock, and V. M. Fowler. 1994. J. Cell Biol. 127:1627-1635). To gain insight into the mechanisms of thin filament assembly and the role of tropomodulin therein, we have characterized the temporal appearance, biosynthesis and mechanisms of assembly of tropomodulin onto the pointed ends of thin filaments during the formation of striated myofibrils in primary embryonic chick cardiomyocyte cultures. Our results demonstrate that tropomodulin is not assembled ...
A mutation in the alpha tropomyosin gene TPM3 associated with autosomal dominant nemaline myopathy. - Radcliffe Department of...
Nemaline myopathies are diseases characterized by the presence in muscle fibres of pathognomonic rod bodies. These are composed largely of alpha-actinin and actin. We have identified a missense mutation in the alpha-tropomyosin gene, TPM3, which segregates completely with the disease in a family whose autosomal dominant nemaline myopathy we had previously localized to chromosome 1p13-q25. The mutation substitutes an arginine residue for a highly conserved methionine in a putative actin-binding site near the N terminus of the alpha-tropomyosin. The mutation may strengthen tropomyosin - actin binding, leading to rod body formation, by adding a further basic residue to the postulated actin-binding motif.
Cold adaptation of Atlantic salmon tropomyosin: role of residue 77 - Memorial University Research Repository
Tropomyosin from the fast skeletal (trunk) muscle of Atlantic salmon (Salmo salar) is an alpha-type isoform. It shares ~93% identity with a counterpart from rabbit skeletal muscle (20 amino acid substitutions out of a total of 284) but is less thermally stable. -- An interesting aspect of the small heterogeneity is the replacement of lysine-77 in rabbit with threonine in salmon. In the case of the mammalian protein, the lysine in question is positioned to form ion pairs with aspartate-80 in the next turn of the same helix and also with glutamate 82 in the opposing helix of the coiled coil. Thus, at neutral pH, salmon tropomyosin loses two potential charge-charge (ion pair) interactions. The contribution of residue-77 to the properties of salmon tropomyosin has been investigated by mutating it to the amino acid in rabbit using site directed mutagenesis, followed by circular dichroism, differential scanning calorimetry, affinity chromatography and limited proteolysis. A major finding of this ...
Studies on the regulatory complex of rabbit skeletal muscle: Contributions of troponin subunits and tropomyosin in the presence...
TY - JOUR. T1 - Studies on the regulatory complex of rabbit skeletal muscle. T2 - Contributions of troponin subunits and tropomyosin in the presence and absence of Mg2+ to the acto-S1 ATPase activity. AU - Van Eyk, Jennifer E.. AU - Cachia, Paul J.. AU - Ingraham, Richard H.. AU - Hodges, Robert S.. PY - 1986/10/1. Y1 - 1986/10/1. N2 - The regulatory roles of the components of the troponin-tropomyosin complex in the presence and absence of Mg2+ on the acto-S1 ATPase have been examined. The effect of free Mg2+ on the inhibition of the acto-S1 ATPase by rabbit skeletal troponin (Tn) was studied at S1 to actin ratios ranging from 0.17:1 to 2.5:1. These studies were performed using two Mg2+ concentrations: 2.5 mM Mg2+-2.5 mM ATP, conditions considered to have low free Mg2+; and 5.0 mM Mg2+-2.5 mM ATP, conditions providing a high free Mg2+ concentration of ∼2.5 mM. In the presence of high free Mg2+ (2.5 mM ATP-5.0 mM MgCl2) the Tn inhibition of acto-S1-TM ATPase increased by approximately 40-50% ...
Co-transcriptional commitment to alternative splice site selection. - Oxford Neuroscience
Production of mRNA in eukaryotic cells involves not only transcription but also various processing reactions such as splicing. Recent experiments have indicated that there are direct physical connections between components of the transcription and processing machinery, supporting previous suggestions that pre-mRNA splicing occurs co-transcriptionally. Here we have used a novel functional approach to demonstrate co-transcriptional regulation of alternative splicing. Exon 3 of the alpha-tropomyosin gene is specifically repressed in smooth muscle cells. By delaying synthesis of an essential downstream inhibitory element, we show that the decision to splice or repress exon 3 occurs during a limited window of opportunity following transcription, indicating that splice site selection proceeds rapidly after transcription.
Aberrant movement of β-tropomyosin associated with congenital myopathy causes defective response of myosin heads and actin...
© 2015 Elsevier Inc. Abstract We have investigated the effect of the E41K, R91G, and E139del β-tropomyosin (TM) mutations that cause congenital myopathy on the position of TM and orientation of actin monomers and myosin heads at different mimicked stages of the ATPase cycle in troponin-free ghost muscle fibers by polarized fluorimetry. A multi-step shifting of wild-type TM to the filament center accompanied by an increase in the amount of switched on actin monomers and the strongly bound myosin heads was observed during the ATPase cycle. The R91G mutation shifts TM further towards the inner and outer domains of actin at the strong- and weak-binding stages, respectively. The E139del mutation retains TM near the inner domains, while the E41K mutation captures it near the outer domains. The E41K and R91G mutations can induce the strong binding of myosin heads to actin, when TM is located near the outer domains. The E139del mutation inhibits the amount of strongly bound myosin heads throughout the ATPase
Tropomyosin - Haliotis diversicolor (Abalone)
Tropomyosin, in association with the troponin complex, plays a central role in the calcium dependent regulation of muscle contraction.
An RNA‐binding atypical tropomyosin recruits kinesin‐1 dynamically to oskar mRNPs | The EMBO Journal
Loading of the appropriate transport machinery on mRNPs is critical to achieve correct localization and, consequently, localized translation of the transcript. Although mRNA transport has been extensively studied over the last two decades, the recruitment of plus‐end‐directed kinesin motors to mRNPs and their regulation remains poorly understood (Medioni et al, 2012).. Here, we have shown that the majority of kinesin‐1 motor associated with oskar mRNA is recruited by Tropomyosin1‐I/C, a non‐canonical RNA binding protein, which explains the mislocalization of oskar mRNA when Tm1‐I/C is lacking (Erdelyi et al, 1995; Veeranan‐Karmegam et al, 2016; and this study). We found that this recruitment occurs early in the cytoplasmic life of the mRNA, upon its nucleo‐cytoplasmic export, in the perinuclear cytoplasm of the nurse cells, where dimerization of oskar mRNA molecules via their 3′UTRs commences (Little et al, 2015). Our observations are consistent with an ergonomic ...
Navigate to: Michael Rynkiewicz
Rynkiewicz MJ, Wu H, Cafarella TR, Nikolaidis NM, Head JF, Seaton BA, McCormack FX. (2017) Differential Ligand Binding Specificities of the Pulmonary Collectins Are Determined by the Conformational Freedom of a Surface Loop. Biochemistry. Aug 8; 56(31):4095-4105. PMID: 28719181.. Rynkiewicz MJ, Fischer S, Lehman W. (2016) The propensity for tropomyosin twisting in the presence and absence of F-actin. Arch Biochem Biophys. 2016 Nov 1; 609:51-58. PMID: 27663225.. Goh BC, Wu H, Rynkiewicz MJ, Schulten K, Seaton BA, McCormack FX. (2016) Elucidation of Lipid Binding Sites on Lung Surfactant Protein A Using X-ray Crystallography, Mutagenesis, and Molecular Dynamics Simulations. Biochemistry. 2016 Jul 5; 55(26):3692-701. PMID: 27324153.. Fischer S, Rynkiewicz MJ, Moore JR, Lehman W. (2016) Tropomyosin diffusion over actin subunits facilitates thin filament assembly. Struct Dyn. 2016 Jan 14; 3(1):012002. PMID: 26798831.. Rynkiewicz MJ, Schott V, Orzechowski M, Lehman W, Fischer S. (2015) Electrostatic ...
Live dynamics of GFP-calponin: isoform-specific modulation of the actin cytoskeleton and autoregulation by C-terminal sequences...
The calponin family of F-actin-, tropomyosin- and calmodulin-binding proteins currently comprises three genetic variants. Their functional roles implicated from in vitro studies include the regulation of actomyosin interactions in smooth muscle cells (h1 calponin), cytoskeletal organisation in non-muscle cells (h2 calponin) and the control of neurite outgrowth (acidic calponin). We have now investigated the effects of calponin (CaP) isoforms and their C-terminal deletion mutants on the actin cytoskeleton by time lapse video microscopy of GFP fusion proteins in living smooth muscle cells and fibroblasts. It is shown that h1 CaP associates with the actin stress fibers in the more central part of the cell, whereas h2 CaP localizes to the ends of stress fibres and in the motile lamellipodial protrusions of spreading cells. Cells expressing h2 CaP spread more efficiently than those expressing h1 CaP and expression of GFP h1 CaP resulted in reduced cell motility in wound healing experiments. Notably, ...
TPM1 - Wikipedia
Tropomyosin alpha-1 chain is a protein that in humans is encoded by the TPM1 gene. This gene is a member of the tropomyosin (Tm) family of highly conserved, widely distributed actin-binding proteins involved in the contractile system of striated and smooth muscles and the cytoskeleton of non-muscle cells. Tm is a 32.7 kDa protein composed of 284 amino acids. Tm is a flexible protein homodimer or heterodimer composed of two alpha-helical chains, which adopt a bent coiled coil conformation to wrap around the seven actin molecules in a functional unit of muscle. It is polymerized end to end along the two grooves of actin filaments and provides stability to the filaments. Human striated muscles express protein from the TPM1 (α-Tm), TPM2 (β-Tm) and TPM3 (γ-Tm) genes, with α-Tm being the predominant isoform in striated muscle. In human cardiac muscle the ratio of α-Tm to β-Tm is roughly 5:1. Tm functions in association with the troponin complex to regulate the calcium-dependent interaction of ...
1 - College Papers Help Online
b.Describe the process of the NT release from a somatic neuron.. 1.Action potential arrives at axon terminal. 2.Voltage-gated Ca++ channels are open and Ca++ enters the axon terminal. 3.Ca++ entering causin the NT being released by exocytosis.. 4.Describe the step by step process of excitation-contraction-relaxation for a skeletal muscle cell (starts with NT binds with the receptor on a skeletal muscle cell).. 1.NT binds with the receptor on a skeletal muscle cell. 2.Sodium Na channel is open (ligand-gated channel). 3.Na influx creating action potential 4.Muscle action potential travels down T-tubules. 5.Sarcoplasmic reticulum releases Ca++. 6.Calcium binds to troponin. 7.Binding Calcium to troponin causing tropomyosin to shift and expose myosin binding sites. 8.Myosin binds to actin and myosin head pulls actin filament. 9.ATP binds to myosin head causing myosin to detach from actin. 10.Myosin head is cocking back and the cycle is repeated as long as Ca++ is attached to troponin.. SKELETAL ...
Electron cryomicroscopy shows cardiac thin filament structure -- MEDICA - World Forum for Medicine
Researchers at Osaka University used electron cryomicroscopy (CryoEM) to image essential cardiac muscle components, known as thin filaments, with unprecedented resolution. They also discovered the mechanism by which these filaments regulate heartbeat via cardiac muscle contractions in the presence or absence of calcium ions by changing their conformations.
Comparison of putative cooperative mechanisms in cardiac muscle: length dependence and dynamic responses (model 4) - Physiome...
All the models are similar in that they are structured around a functional unit of troponin, tropomyosin and actin. Tropomyosin can exist in four states, two permissive or two non-permissive (referring to whether or not the actin sites are available for binding to myosin and hence cross bridge formation). Depending on the model, one or more cross bridges exist, and these are either weakly-bound (non-force generating) or strongly bound (force generating). The paper (cited below) tests the behaviours of the five models of force generation in cardiac myocytes. The first two models provide a baseline of performance for comparison. Models 3 to 5 are developed to incorporate more cooperative mechanisms. From the results of these simulations, which were compared to and consistent with experimental data, it is hypothesised that multiple mechanisms of cooperativity may coexist and contribute to the responses of cardiac muscle. ...
Abstract: In this paper the friction and wear characteristics of vinylester and cenosphere reinforced vinylester composites have been investigated under dry sliding conditions, under different applied normal load and sliding speed. Wear tests were carried using pin on a rotating disc under ambient conditions. Tests were conducted at normal loads 10, 30, 50 and 70 N and under sliding velocity of 1.88, 3.14, 4.39 and 5.65 m/s. The results showed that the coefficient of friction decreases with the increase in applied normal load values under dry conditions. On the other hand for pure vinylester specific wear rate increases with increase in applied normal load. However the specific wear rate for 2%, 6%, 10% and 15% cenosphere reinforced vinylester composite decreases with the increase in applied normal load under dry conditions. The results showed that with increase in the applied normal load and sliding speed the coefficient of friction and spe- cific wear rate decreases under dry sliding ...
KAKEN - Researchers | ABE Toshihiro (10314808)
Affiliation：山口大,医学部附属病院,助手, Research Field：Digestive surgery,Digestive surgery, Keywords：CGH,食道癌,リンパ節転移,LC-MS,tropomyosin,microarray,proteomics,M,Tropomyosin,マイクロアレイ, # of Research Projects：3, # of Research Products：4
MCQ Physiology Muscles Ques. and Answers | Physiology Plus
The muscle protein, which covers the active sites on the actin filament at rest, is: a. Troponin-I b. Troponin-C c. Tropomyosin d. Myosin e. Actinin
IJMS | Free Full-Text | Large-scale Models Reveal the Two-component Mechanics of Striated Muscle | Notes
This paper provides a comprehensive explanation of striated muscle mechanics and contraction on the basis of filament rotations. Helical proteins, particularly the coiled-coils of tropomyosin, myosin and α-actinin, shorten their H-bonds cooperatively and produce torque and filament rotations when the Coulombic net-charge repulsion of their highly charged side-chains is diminished by interaction with ions. The classical
Publications | NCBS
Gangadharan B, Sunitha MS, Mukherjee S, Chowdhury RRoy, Haque F, Sekar N, Sowdhamini R, Spudich JA, Mercer JA. 2017. Molecular mechanisms and structural features of cardiomyopathy-causing troponin T mutants in the tropomyosin overlap region.. Proc Natl Acad Sci U S A. ...
Publications | NCBS
Gupte TM, Haque F, Gangadharan B, Sunitha MS, Mukherjee S, Anandhan S, Rani DSelvi, Mukundan N, Jambekar A, Thangaraj K et al.. 2015. Mechanistic heterogeneity in contractile properties of α-tropomyosin (TPM1) mutants associated with inherited cardiomyopathies.. J Biol Chem. 290(11):7003-15. ...
adducin - oi
A membrane skeleton protein (heterodimer) that interacts with a junctional complex that links spectrin assemblies. The complex in the red blood cell consists of tropomyosin and actin with band 4.1 (see band). Adducin probably binds to band 4.1.. [...] ...
REGULATION OF RABBIT SKELETAL MUSCLE CONTRACTION .1. BIOCHEMICAL STUDIES OF INTERACTION OF TROPOMYOSIN-TROPONIN COMPLEX WITH ACTIN AND PROTEOLYTIC FRAGMENTS OF MYOSIN ...
Recombinant Human TPM4 protein (ab105576) References
References for Abcams Recombinant Human TPM4 protein (ab105576). Please let us know if you have used this product in your publication
D66 strain of Chlamydomonas reinhardtii
... adding tropomyosin; varying light conditions; and varying temperature. The results of these studies showed that the D66 strain ...
Calponin also binds tropomyosin, tubulin, desmin, Ca2+-calmodulin, Ca2+-S100, myosin, and phospholipids. Calponin also ... Childs TJ, Watson MH, Novy RE, Lin JJ, Mak AS (1992). "Calponin and tropomyosin interactions". Biochimica et Biophysica Acta ( ... interaction with tropomyosin paracrystals". Journal of Hypertension Supplement. 6 (4): S40-3. doi:10.1097/00004872-198812040- ...
... a tropomyosin isoform encoded by the gamma-tropomyosin gene". Biochem. Biophys. Res. Commun. 201 (2): 627-34. doi:10.1006/bbrc. ... A tropomyosin-binding protein". J Biol Chem. 267 (4): 2616-21. PMID 1370827. Sung LA, Fan Y, Lin CC (Dec 1996). "Gene ... 2004). "Alterations in tropomyosin isoform expression in human transitional cell carcinoma of the urinary bladder". Int. J. ... Vera C, Lao J, Hamelberg D, Sung LA (2006). "Mapping the tropomyosin isoform 5 binding site on human erythrocyte tropomodulin: ...
Actin, desmin, myosin, and tropomyosin". Am. J. Pathol. 142 (1): 221-30. PMC 1886840. PMID 8424456. v t e. ...
... in that skin tests confirming dust mite allergy were also positive for shellfish tropomyosin. In addition to tropomyosin, ... Tropomyosin, the major allergen in shellfish allergy, is also found in house dust mites and cockroaches. Exposure to inhaled ... Tropomyosin, arginine kinase, myosin light chain and sarcoplasmic calcium-binding protein are widely present across shellfish ... The immune system overreacts to proteins found in shellfish, most commonly to tropomyosin, but often to other proteins, such as ...
Other proteins that are known to interact with NM IIA include the actin binding protein tropomyosin 4.2 and a novel actin ... Actin, desmin, myosin, and tropomyosin". The American Journal of Pathology. 142 (1): 221-30. PMC 1886840. PMID 8424456. Lalwani ... "Load-dependent modulation of non-muscle myosin-2A function by tropomyosin 4.2". Scientific Reports. 6: 20554. doi:10.1038/ ...
Actin, desmin, myosin, and tropomyosin". The American Journal of Pathology. 142 (1): 221-30. PMC 1886840. PMID 8424456. ... contraction is activated through thin filament proteins troponin and tropomyosin, whereas in NM-IIB and smooth muscle myosin, ...
Tropomyosin alpha-4 chain is a protein that in humans is encoded by the TPM4 gene. GRCh38: Ensembl release 89: ENSG00000167460 ... "Entrez Gene: TPM4 tropomyosin 4". Rasmussen HH, van Damme J, Puype M, et al. (1993). "Microsequences of 145 proteins recorded ... Wilton SD, Lim L, Dorosz SD, Gunn HC, Eyre HJ, Callen DF, Laing NG (Jul 1996). "Assignment of the human alpha-tropomyosin gene ... 1986). "A muscle-type tropomyosin in human fibroblasts: evidence for expression by an alternative RNA splicing mechanism". Proc ...
Actin, desmin, myosin, and tropomyosin". Am. J. Pathol. 142 (1): 221-30. PMC 1886840. PMID 8424456. Xu XR, Huang J, Xu ZG, et ...
Actin, desmin, myosin, and tropomyosin". Am. J. Pathol. 142 (1): 221-30. PMC 1886840. PMID 8424456. New L, Jiang Y, Zhao M, et ...
An accepted mechanism for this process is that ADP-bound myosin attaches to actin while thrusting tropomyosin inwards, then the ... Actin, desmin, myosin, and tropomyosin". The American Journal of Pathology. 142 (1): 221-30. PMC 1886840. PMID 8424456. Nakao K ...
Gunning P, Weinberger R, Jeffrey P (Apr 1997). "Actin and tropomyosin isoforms in morphogenesis". Anatomy and Embryology. 195 ( ...
Tropomyosin alpha-1 chain is a protein that in humans is encoded by the TPM1 gene. This gene is a member of the tropomyosin (Tm ... Perry SV (2004). "What is the role of tropomyosin in the regulation of muscle contraction?". J. Muscle Res. Cell. Motil. 24 (8 ... Cho YJ, Liu J, Hitchcock-DeGregori SE (1990). "The amino terminus of muscle tropomyosin is a major determinant for function". J ... 1988). "Evolution of tropomyosin functional domains: differential splicing and genomic constraints". J. Mol. Evol. 27 (3): 228- ...
Troponin C type 1
The IT arm is anchored to tropomyosin via adjacent segments of cTnT, so it is believed to move as a unit along with tropomyosin ... Tripet B, Van Eyk JE, Hodges RS (Sep 1997). "Mapping of a second actin-tropomyosin and a second troponin C binding site within ... von der Ecken J, Müller M, Lehman W, Manstein DJ, Penczek PA, Raunser S (Mar 2015). "Structure of the F-actin-tropomyosin ... The availability of cTnI148-159 depends on the blocked-closed-open equilibrium of tropomyosin on actin, which can be impacted ...
... tropomyosin, alpha-actinin. Xin, and XIRP2. Nebulette was identified in 1995 by Moncman and Wang using primary cultures of ... depressed beating frequencies and loss of thin filament regulatory proteins troponin I and tropomyosin. Mutations in the NEBL ... "The nebulette repeat domain is necessary for proper maintenance of tropomyosin with the cardiac sarcomere". Experimental Cell ...
von der Ecken J, Müller M, Lehman W, Manstein DJ, Penczek PA, Raunser S (May 2015). "Structure of the F-actin-tropomyosin ... The helical F-actin filament found in muscles also contains a tropomyosin molecule, which is a 40 nanometre long protein that ... During the resting phase the tropomyosin covers the actin's active sites so that the actin-myosin interaction cannot take place ... There are other protein molecules bound to the tropomyosin thread, these are the troponins that have three polymers: troponin I ...
Tropomyosin receptor kinase B § Antagonists Cazorla, Maxime; Prémont, Joël; Mann, Andre; Girard, Nicolas; Kellendonk, Christoph ... tropomyosin-related kinase B in hippocampus of obesity-induced hypertensive rats". Int Heart J. 56 (1): 110-5. doi:10.1536/ihj. ...
Hodges RS, Sodek J, Smillie LB, Jurasek L (1973). "Tropomyosin: Amino Acid Sequence and Coiled-Coil Structure". Cold Spring ...
Ebashi, S; Kodama, A (1965). "A new protein factor promoting aggregation of tropomyosin". Journal of Biochemistry. 58 (1): 107- ...
Tropomyosin receptor kinase B § Agonists Longo, Frank M.; Massa, Stephen M. (2013). "Small-molecule modulation of neurotrophin ...
Ono S, Ono K (March 2002). "Tropomyosin inhibits ADF/cofilin-dependent actin filament dynamics". J. Cell Biol. 156 (6): 1065-76 ...
Nerve growth factor
The tropomyosin receptor kinase A receptor has five extracellular domains, and the fifth domain is sufficient in binding NGF. ... NGF can drive the expression of genes such as bcl-2 by binding to the Tropomyosin receptor kinase A, which stimulates the ... NGF binds with at least two classes of receptors: the tropomyosin receptor kinase A (TrkA) and low-affinity NGF receptor (LNGFR ... Stoleru B, Popescu A, Tache D, Neamtu O, Emami G, Tataranu L, Buteica A, Dricu A, Purcaru S (2013). "Tropomyosin-Receptor- ...
The oncogene was generated by a mutation in chromosome 1 that resulted in the fusion of the first seven exons of tropomyosin to ... Normal Trk receptors do not contain amino acid or DNA sequences related to tropomyosin. The three most common types of trk ... Stoleru B, Popescu A, Tache D, Neamtu O, Emami G, Tataranu L, Buteica A, Dricu A, Purcaru S (2013). "Tropomyosin-Receptor- ... Martin-Zanca D, Hughes SH, Barbacid M (1986). "A human oncogene formed by the fusion of truncated tropomyosin and protein ...
Squid as food
As with other molluscs, the allergen is probably tropomyosin. Chinese-style fried baby squid Japanese Ikameshi Japanese Ika ...
Tavilermide Tropomyosin receptor kinase A World Health Organization (2017). "International nonproprietary names for ...
Khaitlina, Sofia; Fitz, Helene; Hinssen, Horst (2013-07-11). "The interaction of gelsolin with tropomyosin modulates actin ... Tropomyosin,fatty acids and phospholipids (see also: Binding and inactivation of diverse inflammatory mediators): LPA,LPS ( ...
β-Tropomyosin, also known as tropomyosin beta chain is a protein that in humans is encoded by the TPM2 gene. β-tropomyosin is ... β-tropomyosin) and TPM3 (γ-tropomyosin) genes, with α-tropomyosin being the predominant isoform in striated muscle. Fast ... β-tropomyosin also has a Serine residue at position 283, thus, it is likely that β-tropomyosin is also phosphorylated. Mouse ... β-tropomyosin functions in association with α-tropomyosin and the troponin complex-composed of troponin I, troponin C and ...
One of the proteins that trigger allergic reactions is tropomyosin. These allergens are also linked with asthma. About 60% of ... 1999). "Cockroach allergens and asthma in Brazil: identification of tropomyosin as a major allergen with potential cross- ...
Anti-smooth muscle antibody
These antibodies can be directed against actin, troponin, and tropomyosin. Dawkins, RL; Joske RA (June 1973). "Immunoglobulin ...
Thomas P. Stossel
Isolation and some structural and functional properties of macrophage tropomyosin. Biochemistry. 1983; 22:1187-1193. 78. Harmon ...
Equilibrium of the actin-tropomyosin interaction. - PubMed - NCBI
Tropomyosin - Haliotis diversicolor (Abalone)
Tropomyosin, in association with the troponin complex, plays a central role in the calcium dependent regulation of muscle ... Belongs to the tropomyosin family.Curated. Keywords - Domaini. Coiled coil, Repeat. Family and domain databases. Integrated ... Tropomyosin1 Publication. ,p>Manually curated information that is based on statements in scientific articles for which there is ... Tropomyosin, in association with the troponin complex, plays a central role in the calcium dependent regulation of muscle ...
Tropomyosin - Coptotermes formosanus (Formosan subterranean termite)
TropomyosinImported. ,p>Information which has been imported from another database using automatic procedures.,/p> ,p>,a href="/ ... Belongs to the tropomyosin family.UniRule annotation. Automatic assertion according to rulesi ... tr,R4V158,R4V158_COPFO Tropomyosin OS=Coptotermes formosanus OX=36987 PE=2 SV=1 ...
Anti-Tropomyosin 2 antibody (ab96073) Protocols | Abcam
Anti-Tropomyosin 3 antibody [3D5AH3AB4] (ab113692) | Abcam
Mouse monoclonal Tropomyosin 3 antibody [3D5AH3AB4]. Validated in WB, IP, IHC, Flow Cyt, ICC/IF and tested in Mouse, Rat, Human ... Signal Transduction Cytoskeleton / ECM Cytoskeleton Microfilaments Actin etc Tropomyosin Share by email ... All lanes : Anti-Tropomyosin 3 antibody [3D5AH3AB4] (ab113692) at 1 µg/ml. Lane 1 : HepG2 (human). Lane 2 : HDFN (human). Lane ... IHC image of Tropomyosin 3 staining in Human heart formalin fixed paraffin embedded tissue section, performed on a Leica BondTM ...
Tropomyosin | ProSpec
RCSB PDB - Protein Feature View - Tropomyosin alpha-3 chain - P06753 (TPM3 HUMAN)
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.
Novus Biologicals tropomyosin-2 Protein 0.05mg:Life Sciences | Fisher Scientific
Shop a large selection of Proteins A-Z products and learn more about Novus Biologicals tropomyosin-2 Protein 0.05mg:Life ... A recombinant protein with a N-Terminal His-tag and corresponding to the amino acids 1-284 of Human tropomyosin-2 The ... The Recombinant Human tropomyosin-2 Protein has been validated for the following applications: SDS-Page. ... Recombinant Human tropomyosin-2 Protein is derived from E. coli. ...
Tropomyosin Summary Report | CureHunter
Tropomyosin: A protein found in the thin filaments of muscle fibers. It inhibits contraction of the muscle unless its position ... alpha-Tropomyosin; beta-Tropomyosin; gamma-Tropomyosin; Mg, Tropomyosin; alpha Tropomyosin; beta Tropomyosin; gamma Tropomyosin ... Tropomyosin. Subscribe to New Research on Tropomyosin A protein found in the thin filaments of muscle fibers. It inhibits ... 12/01/2015 - "The tropomyosin isoform (Tpm) expression profile of a range of cancer cell lines (21) demonstrates that Tpm3.1 is ...
Structural analysis of smooth muscle tropomyosin α and β isoforms. | Sigma-Aldrich
A De Novo Mutation in α-Tropomyosin That Causes Hypertrophic Cardiomyopathy | Circulation
Mutations in α-tropomyosin and in cardiac troponin T cause hypertrophic cardiomyopathy: a disease of the sarcomere. Cell. 1994; ... A De Novo Mutation in α-Tropomyosin That Causes Hypertrophic Cardiomyopathy. Hugh Watkins, Ryuichiro Anan, Domenico A. Coviello ... Mutations in the genes for cardiac troponin T and α-tropomyosin in hypertrophic cardiomyopathy. N Engl J Med. 1995;332:1058- ... Unlike the β-cardiac myosin heavy chain2 and cardiac troponin T genes,1 the α-tropomyosin gene is expressed ubiquitously, yet ...
Abstract 20419: Citrullination in Actin-Tropomyosin-Myosin Complex: Novel Regulatory Mechanism | Circulation
Method: F-actin-tropomyosin binding, tropomyosin-actin-myosin, actin-myosin and myosin ATPase activity assays, and F-actin ... Abstract 20419: Citrullination in Actin-Tropomyosin-Myosin Complex: Novel Regulatory Mechanism. Justyna Fert-Bober, Jennifer ... Results: In vitro citrullinated tropomyosin significantly enhance affinity for F-actin (p=0.001) and decrease in the ATPase ... Abstract 20419: Citrullination in Actin-Tropomyosin-Myosin Complex: Novel Regulatory Mechanism. Justyna Fert-Bober and Jennifer ...
Tropomyosin receptor kinase fusion cancer
anti-Tropomyosin 1 (Alpha) Primary Antibodies
alpha-tropomyosin 1 , alpha-tropomyosin 2 , alpha-tropomyosin of skeletal fast muscle , tropomyosin (CTm4) , tropomyosin (CTm7 ... tropomyosin alpha-1 chain , tropomyosin-1 , tropomyosin 1 alpha chain , alpha tropomyosin , alpha-tropomyosin , hepatoma alpha ... tropomyosin 1 (alpha) isoform 1 , tropomyosin 1 (alpha) isoform 2 , tropomyosin 1 (alpha) isoform 3 , tropomyosin 1 (alpha) ... isoform 4 , tropomyosin 1 (alpha) isoform 5 , tropomyosin 1 (alpha) isoform 6 , tropomyosin 1 (alpha) isoform 7 , tropomyosin 1 ...
Tropomyosin 4 (TPM4) ELISA Kits
Protein level used designations for Tropomyosin 4 (TPM4) ELISA Kits tropomyosin 4 , tropomyosin alpha-4 chain , TM30p1 , ... Tropomyosin 4 (TPM4) Antigen Profile Antigen Summary This gene encodes a member of the tropomyosin family of actin-binding ... Top referenced Tropomyosin 4 ELISA Kits. Show all Tropomyosin 4 (TPM4) ELISA Kits with Pubmed References. * Human TPM4 ELISA ... Pig (Porcine) Tropomyosin 4 (TPM4) interaction partners * upregulation of tropomyosin 4 (TM4) mRNA is a relevant marker of ...
Two general classes of cytoplasmic actin filaments in tissue culture cells: the role of tropomyosin. - PubMed - NCBI
SMART: Pfam domain Tropomyosin
The role of tropomyosin in smooth muscle and non-muscle tissues is not clear. Tropomyosin is an alpha-helical protein that ... Tropomyosin. PFAM accession number:. PF00261. Interpro abstract (IPR000533):. Tropomyosins [(PUBMED:3606587)], are a family of ... Muscle isoforms of tropomyosin are characterised by having 284 amino acid residues and a highly conserved N-terminal region, ... This entry represents tropomyosin (Tmp) 1, 2 and 3. Within the yeast Tmp1 and Tmp2, biochemical and sequence analyses indicate ...
Tropomyosin: Function Follows Structure | Springer for Research & Development
Studies of the structure and dynamics of tropomyosin, accompanied by biochemical and biophysical... ... Tropomyosin is known as the archetypal coiled coil, being the first to be sequenced and modeled. ... The effect of N-terminal acetylation on the structure of an N-terminal tropomyosin peptide and alpha alpha-tropomyosin. Protein ... Studies of the structure and dynamics of tropomyosin, accompanied by biochemical and biophysical analyses of tropomyosin, ...
Elevated tropomyosin expression is associated with epithelial-mesenchymal transition of lens epithelial cells - Kubo - 2012 -...
Elevated tropomyosin expression is associated with epithelial-mesenchymal transition of lens epithelial cells. Authors. *. Eri ... The tropomyosin (Tpm) family of cytoskeleton proteins is involved in regulating and stabilizing actin microfilaments. Aberrant ... FGF2 antagonizes aberrant TGFβ regulation of tropomyosin: role for posterior capsule opacity, Journal of Cellular and Molecular ... Natural antisense transcript TPM1-AS regulates the alternative splicing of tropomyosin I through an interaction with RNA- ...
Tropomyosin Quiz - The Full Wiki
Question 6: Tropomyosin is an alpha helical coiled coil protein dimer that binds end to end along F ________ filaments in ... Question 3: Tropomyosin blocks ________ binding and hence crossbridge cycling in the absence of Ca2+.. Myosin. Tubulin. Kinesin ... Question 4: Tropomyosin, along with the troponin complex, associate with ________ in muscle fibers and regulate muscle ...
anti-Tropomyosin 3 antibody | GeneTex
... tropomyosin 3) for ICC/IF, IHC-P, WB. Anti-Tropomyosin 3 pAb (GTX16386) is tested in Human, Mouse, Rat samples. 100% Ab- ... tropomyosin 3. Background. This gene encodes a member of the tropomyosin family of actin-binding proteins involved in the ... IHC-P analysis of human kidney using Tropomyosin 3 antibody at a dilution of 1:200.. Top ... IHC-P analysis of human kidney using Tropomyosin 3 antibody at a dilution of 1:200.. Top ...
Structures and interactions of tropomyosin with caldesmon and troponin
The regulatory properties of tropomyosin are mediated by its interactions with muscle-specific tropomyosin binding proteins. In ... Tropomyosin plays a central role in the regulation of skeletal, cardiac, and smooth muscle regulation. ... Biosensors studies of tropomyosin interacting with caldesmon and troponin measured association rate, dissociation rate, and ... However, failure to lower the R-free suggests that this model does not accurately describe the structure of tropomyosin within ...
Tropomyosin is required for normal lens development and differentiation | IOVS | ARVO Journals
Tropomyosin is required for normal lens development and differentiation Eri Kubo; Teppei Shibata; Etsuko Kiyokawa; Masahito ... Purpose : Tropomyosin (Tpm) 1 and 2 are involved in the regulation of posterior capsule opacification (PCO). Knock-out of Tpm2 ... Tropomyosin is required for normal lens development and differentiation You will receive an email whenever this article is ... Eri Kubo, Teppei Shibata, Etsuko Kiyokawa, Masahito Ikawa, Dhirendra P Singh, Hiroshi Sasaki; Tropomyosin is required for ...
Tropomyosin-3 (TPM3) antibody | acris-antibodies.com
TPM3 is a member of the tropomyosin family of actin-binding proteins involved in the contractile system of striated and smooth ... Alternative names for Tropomyosin-3 (TPM3) antibody. Tropomyosin alpha-3 chain, Gamma-tropomyosin, Tropomyosin-5, TPM5 ... Tropomyosin-3 (TPM3) (transcript variant 5). Not available. Purified recombinant protein of Homo sapiens tropomyosin 3 (TPM3), ... Tropomyosin-3 (TPM3) (transcript variant 1). Not available. Recombinant protein of human tropomyosin 3 (TPM3), transcript ...
Gamma Tropomyosin Gene Products Are Required for Embryonic Development | Molecular and Cellular Biology
A non-flight muscle isoform of Drosophila tropomyosin rescues an indirect flight muscle tropomyosin mutant. J. Muscle Res. Cell ... Gamma Tropomyosin Gene Products Are Required for Embryonic Development. J. Hook, F. Lemckert, H. Qin, G. Schevzov, P. Gunning ... Tropomyosin is essential in yeast, yet the TPM1 and TPM2 products perform distinct functions. J. Cell Biol. 128:383-392. ... Gamma Tropomyosin Gene Products Are Required for Embryonic Development Message Subject (Your Name) has forwarded a page to you ...
Suppression of Th2 immune responses by the sulfated polysaccharide from Porphyra haitanensis in tropomyosin-sensitized mice. |...
ISRCTN - ISRCTN75715723: Tropomyosin receptor kinase antagonism in cylindromatosis
This study aims to evaluate a new ointment to treat an inherited skin tumour condition called cylindromatosis. Patients from families with this condition carry an error in their DNA (CYLD mutation) that results in the development of multiple skin tumours on the face, scalp and trunk. These tumours are disfiguring, can be painful, and may ulcerate and bleed. Surgery is the only available treatment, and up to 1 in 4 patients with this condition undergo removal of their entire scalp to manage this condition. We have recently discovered an abnormal signal in the tumour cells called TRK. This signal is recognised to give tumour cells the ability to survive, and in laboratory tests blocking it with drugs called TRK inhibitors results in the tumour cells dying. We propose a study of an ointment form of TRK inhibitor as a means to reduce tumour growth in these patients. We have partnered with a drug company (Creabilis) who have already produced this ointment (called CT327) for trials in skin conditions. ...
Phosphoregulation of tropomyosin is crucial for actin cable turnover and division site placement | JCB
Tropomyosin is a coiled-coil actin binding protein key to the stability of actin filaments. In muscle cells, tropomyosin is ... Fission yeast expresses a single tropomyosin encoded by the cdc8 gene (Balasubramanian et al., 1992). Cdc8-tropomyosin is a ... Tropomyosin as a Regulator of Actin Dynamics. Int. Rev. Cell Mol. Biol. 318:255-291. doi:10.1016/bs.ircmb.2015.06.002. ... A new tropomyosin essential for cytokinesis in the fission yeast S. pombe. Nature. 360:84-87. doi:10.1038/360084a0. ...
The American Journal of Tropical Medicine and Hygiene | Schistosoma Mansoni Tropomyosin: Production and Purification of the...
... and without infection reacted with the recombinant tropomyosin. The species specificity of S. mansoni tropomyosin suggests that ... The recombinant S. mansoni tropomyosin was purified from preparative SDS-PAGE gel and by a combination of 20% ammonium sulfate ... The purified recombinant S. mansoni tropomyosin was tested as an immunodiagnostic reagent in Western blot and enzyme-linked ... Abstract A cDNA that encodes Schistosoma mansoni tropomyosin, except for 10 amino acids at the amino terminus, has been cloned ...
ProteinGeneAbstractIsoformBeta-tropomyosinProteinsThin filamentCytoskeletonReceptorAllergen TropomyosinRecombinant tropomyosinSmooth muscle tropomyosinGenesProperties of tropomyosinMutationsMutationExonHuman TropomyosinTroponin-tropomyosinNonmuscle tropomyosinAntibodiesInteractionMoleculeAntibodyRegulatesAffinityPyrene-labeled tropomyosinSkeletal muscle tropomyosinMoleculesMyosin subfragmentSensitized with recombinantCalciumTPM4Role of tropomyosinCardiacEncodesActin-tropomyosinShrimp tropomyosinAminoSpecies specificityRabbit skeletal muscleInteractionsTPM1FilamentsMutants
- Tropomyosin is a two-stranded alpha-helical, coiled coil protein found in actin-based cytoskeletons. (wikipedia.org)
- A polymer of a second protein, tropomyosin, is an integral part of most actin filaments in animals. (wikipedia.org)
- A recombinant protein with a N-Terminal His-tag and corresponding to the amino acids 1-284 of Human tropomyosin-2 The Recombinant Human tropomyosin-2 Protein is derived from E. coli. (fishersci.com)
- The Recombinant Human tropomyosin-2 Protein has been validated for the following applications: SDS-Page. (fishersci.com)
- A novel protein post-translational modification, citrullination was shown previously in a number of key myofilament proteins, tropomyosin (R 133, R 238), actin (R 39) and myosin heavy chain (R 1176, 1303, 1434) in HF patient (values for total spectra counts for citrullinated proteins in control, ISHD and IDCM: 1.8 ±1.3, 3.2±2.7 and 2.3±1.9, respectively). (ahajournals.org)
- Zusätzlich bieten wir Ihnen Tropomyosin 1 (Alpha) Proteine (39) und Tropomyosin 1 (Alpha) Kits (2) und viele weitere Produktgruppen zu diesem Protein an. (antikoerper-online.de)
- Additionally we are shipping Tropomyosin 4 Antibodies (46) and Tropomyosin 4 Proteins (12) and many more products for this protein. (antibodies-online.com)
- Bailey K. Tropomyosin: a new asymmetric protein component of muscle. (springer.com)
- Tropomyosin is an alpha helical coiled coil protein dimer that binds end to end along F ________ filaments in striated muscle . (thefullwiki.org)
- The longer amino-terminal domain of the cardiac protein bound further along the carboxyl region of tropomyosin than skeletal troponin T, and the carboxyl-terminal domain of cardiac troponin T bound to tropomyosin more tightly than its skeletal counterpart. (rice.edu)
- Tropomyosin is a coiled-coil actin binding protein key to the stability of actin filaments. (rupress.org)
- The recombinant S. mansoni tropomyosin was purified from preparative SDS-PAGE gel and by a combination of 20% ammonium sulfate fractionation and fast protein liquid chromatographyionexchange chromatography. (ajtmh.org)
- On contraction of the muscle, the tropomyosin is displaced by another protein, troponin, allowing the interaction of actin with myosin. (oup.com)
- Tropomodulin is a pointed end capping protein for tropomyosin-coated actin filaments that is hypothesized to play a role in regulating the precise lengths of striated muscle thin filaments (Fowler, V. M., M. A. Sussman, P. G. Miller, B. E. Flucher, and M. P. Daniels. (rupress.org)
- In fact, tropomodulin assembles later than all other well characterized myofibrillar proteins studied including: actin, tropomyosin, alpha-actinin, titin, myosin and C-protein. (rupress.org)
- Analysis of protein synthesis in head and gastric tissue indicated a high rate of tropomyosin synthesis in head tissue. (uni-muenchen.de)
- Many of these filament systems are bound by the actin-binding protein tropomyosin (Tm). (garvan.org.au)
- Dividing shrimp tropomyosin into five fragments did not reduce the allergenicity of the protein. (figshare.com)
- Here we show that a 35-kDa member of the SR protein family, 9G8, can activate the splicing of α-tropomyosin exon 2. (pubmedcentralcanada.ca)
- Two founder mutations for HCM in Finland are located in myosin-binding protein C (MYBPC3-Gln1061X) and α-tropomyosin (TPM1-Asp175Asn) genes. (uta.fi)
- The pattern of organization of these tropomyosin isoforms correlated with their expression such that a profound decrease in Tm 2 expression was observed both at the transcript and protein levels, whereas Tm 5 remained relatively unchanged. (rupress.org)
- No rabbit tropomyosin nucleotide sequences are known, although protein sequences for alpha- and beta-tropomyosin expressed by rabbit skeletal muscle have been described. (edu.au)
- It differs from rabbit skeletal muscle beta-tropomyosin (81.7% homology at the protein level) mainly in two regions at amino acids 189-213 and 258-283 suggesting alternative splicing of exons 6a for 6b and 9d for 9a. (edu.au)
- Each tropomyosin molecule is held in this blocking position by troponin, a smaller, globular protein that is bound to both tropomyosin and actin. (blogspot.com)
- Methods: Shrimp tropomyosin was cloned and expressed as a His-tagged fusion recombinant protein in Escherichia coli. (elsevier.com)
- The first human TrkA-derived oncogene, Trk-oncogene, was identified in colon cancer as a novel chimeric fusion between truncated tropomyosin and protein tyrosine kinase sequence [ 3 ]. (biomedcentral.com)
- Tropomyosin alpha-3 chain is a protein that in humans is encoded by the TPM3 gene . (wikidoc.org)
- One of the major allergen found in shrimps and many other crustaceans is the ubiquitous muscle protein tropomyosin, this is also responsible for a large number of the ingestion related allergic reactions. (elisakits.co.uk)
- Currently, there are a few procedure available (PCR, lateral flow assays, ELISA) but not many are able to detect tropomyosin protein. (elisakits.co.uk)
- Crustaceans have one muscle protein in common: Tropomyosin. (emportllc.com)
- Tropomyosin is an actin-binding protein that, in absence of Ca++, binds to F- actin and along with troponin complex regulate muscle contraction. (blogspot.com)
- Amino acid sequence analysis of these peptides and several other peptides generated by Asp N and Lys C treatment revealed an 861 homology with the muscle protein tropomyosin from the fruit fly Drosophila melanogaster, suggesting that the major shrimp allergen is tropomyosin. (iisc.ac.in)
- Tropomyosin is a rod shaped protein with multiple molecules that bind the head of the actin filament to the tail. (wikiversity.org)
- We have developed a system that allows the production of one kind of protein modification in bacteria, N-terminal acetylation [ 1 ], by coexpressing the yeast NatB acetylation complex and the target protein tropomyosin (TM). (biomedcentral.com)
- Tropomyosin is a protein that plays a role both in controlling the contraction of muscle and also a much more general role as part of the scaffolding matrix within cells, known as the actin cytoskeleton. (biomedcentral.com)
- Singer JM, Shaw JM: Mdm20 protein functions with Nat3 protein to acetylate Tpm1 protein and regulate tropomyosin-actin interactions in budding yeast. (biomedcentral.com)
- cDNA encoding tropomyosin, which is a well known cross-reactive pan-allergen, was cloned by reverse transcriptase PCR, and recombinant protein was produced by using a pET-28b expression system. (yonsei.ac.kr)
- Seven of 26 (26.9%) allergic sera had IgE specific for recombinant protein, and the maximum inhibition of P. fuliginosa-specific IgE achieved with recombinant tropomyosin was 37.7% at an inhibitor concentration of 10 μg/ml. (yonsei.ac.kr)
- We have identified a way to attack specific actin filament populations within cells by developing drugs that target specific isoforms of the actin-associated protein tropomyosin. (edu.au)
- Mutations in alpha-TM associated with HCM caused a shift of TM strands to the center of the thin filament and increased a range of tropomyosin motion and affinity of this protein to actin in the ATPase cycle. (ox.ac.uk)
- Background Two missense mutations in the gene for α-tropomyosin have been described that segregate with hypertrophic cardiomyopathy in single families. (ahajournals.org)
- Conclusions De novo mutations in the α-tropomyosin gene can result in hypertrophic cardiomyopathy that may appear to be sporadic but in subsequent generations gives rise to familial disease. (ahajournals.org)
- In addition, these findings provide the strongest genetic evidence that mutations in the α-tropomyosin gene are directly responsible for hypertrophic cardiomyopathy. (ahajournals.org)
- Two different α-tropomyosin gene mutations have been identified in families with hypertrophic cardiomyopathy. (ahajournals.org)
- 1 These data suggest that α-tropomyosin gene mutations are a cause of familial hypertrophic cardiomyopathy. (ahajournals.org)
- However, some features of the mutations in the α-tropomyosin gene contrast with those of mutations in the other disease genes for hypertrophic cardiomyopathy. (ahajournals.org)
- Unlike the β-cardiac myosin heavy chain 2 and cardiac troponin T genes, 1 the α-tropomyosin gene is expressed ubiquitously, yet the disease phenotype is limited to cardiac muscle. (ahajournals.org)
- 4 5 We therefore have studied the proband with the Asp175Asn mutation, along r with all available family members (family DB), to determine whether the α-tropomyosin gene mutation arose de novo. (ahajournals.org)
- Demonstration of a de novo occurrence in a family with hypertrophic cardiomyopathy of a mutation previously seen to segregate with disease provides the strongest evidence that the α-tropomyosin gene is itself a disease gene for hypertrophic cardiomyopathy. (ahajournals.org)
- Exon 5 of the α-tropomyosin gene was amplified from genomic DNA of each family member by polymerase chain reaction (PCR) as described. (ahajournals.org)
- Mutations in this gene result in autosomal dominant nemaline myopathy, and oncogenes formed by chromosomal translocations involving this locus are associated with cancer.This gene encodes a member of the tropomyosin family of actin-binding proteins involved in the contractile system of striated and smooth muscles and the cytoskeleton of non-muscle cells. (acris-antibodies.com)
- The chicken beta-tropomyosin gene contains 11 exons, two of which are spliced into mRNA only in skeletal muscle. (unboundmedicine.com)
- Developmental analysis of tropomyosin gene expression in embryonic stem cells and mouse embryos. (asm.org)
- The Xenopus laevis alpha-tropomyosin (TM) gene, like its vertebrates counterparts, encodes muscle and non-muscle isoforms through two promoters and alternatively spliced exons. (nih.gov)
- The Hydra tropomyosin gene, designated trop1, is a single copy gene, lacks introns and is strongly expressed in tentacle-specific epithelial cells. (uni-muenchen.de)
- The tropomyosin I(TmI) gene of Drosophila melanogaster encodes two isoforms of tropomyosin. (semanticscholar.org)
- Transcription factors GATA/ELT-2 and forkhead/HNF-3/PHA-4 regulate the tropomyosin gene expression in the pharynx and intestine of Caenorhabditis elegans. (semanticscholar.org)
- A muscle-specific intron enhancer required for rescue of indirect flight muscle and jump muscle function regulates Drosophila tropomyosin I gene expression. (semanticscholar.org)
- Differential regulation of tropomyosin isoform organization and gene expression in response to altered actin gene expression. (rupress.org)
- 117:775-786), exhibit a differential pattern of tropomyosin cellular organization and isoform gene expression. (rupress.org)
- These results suggest that relative changes in nonmuscle actin gene expression can affect the organization and expression of tropomyosin in an isoform specific manner. (rupress.org)
- Furthermore, this apparent direct link observed between actin and tropomyosin expression suggests that nonpharmacological signals originating in the cytoskeleton can regulate cytoarchitectural gene expression. (rupress.org)
- We find that mice in which the 9D exon from the TPM3/γTm tropomyosin gene is deleted (γ9D -/-) exhibit a more rapid wound-healing response 7 days after wounding compared with wild-type mice. (edu.au)
- This led to the cloning of a tropomyosin gene predominantly expressed in rabbit SMC during this change. (edu.au)
- Congenital fibre type disproportion associated with mutations in the tropomyosin 3 (TPM3) gene mimicking congenital myasthenia. (ox.ac.uk)
- Previous genome-wide association studies in nearly 70,000 individuals indicated that single nucleotide variants (SNVs) in the gene encoding the actin cytoskeletal regulator tropomyosin 4 (TPM4) exert an effect on the count and volume of platelets. (duhnnae.com)
- Abstract It is confirmed that the presence of native tropomyosin is required in order for the removal of Ca ++ to cause inhibition of the Mg ++ -activated ATPase of actomyosin and acto-heavy-meromyosin. (semanticscholar.org)
- The molecular basis for tropomyosin isoform diversity. (semanticscholar.org)
- The beta-actin transfectants displaying a threefold increase in the cell surface area, showed no significant changes in the pattern of organization of the high M(r) tropomyosin isoform, Tm 2, or the low M(r) tropomyosin isoform, Tm 5. (rupress.org)
- We have therefore analyzed the requirement for tropomyosin isoform expression in a mouse model of cutaneous wound healing. (edu.au)
- Collectively, our data reveal that tropomyosin isoform expression has an important role in temporal regulation of cell migration during wound healing. (edu.au)
- A tropomyosin ( tm ) transcript aligned with a tm isoform of lobster ( tmS2 ), and semi-quantitative RT-PCR confirmed this isoform to be more abundant in the migrating crab muscle. (biologists.org)
- In Aim 1 of this thesis, we demonstrate that a novel isoform of Tropomyosin, namely Tm1C, binds directly to kinesin and functions as the adaptor in linking kinesin to oskar mRNA. (openrepository.com)
- Circular dichroism, fluorescence and chemical modification methods will be used to study the mechanism of assembly of the alpha and beta tropomyosin subunits (whose amino acid sequences slightly differ) into dimers (alphaalpha, alphabeta and betabeta). (grantome.com)
- A large number of tropomyosin (Tm) isoforms function as gatekeepers of the actin filament, controlling the spatiotemporal access of actin-binding proteins to specialized actin networks. (sigmaaldrich.com)
- Citrullination of specific myofilament proteins in HF can have dramatic effect on modulating actin filament integrity and myosin function and tropomyosin action on myofilament regulation. (ahajournals.org)
- TPM4 encodes a member of the tropomyosin family of actin-binding proteins involved in the contractile system of striated and smooth muscles and the cytoskeleton of non-muscle cells. (antibodies-online.com)
- The tropomyosin (Tpm) family of cytoskeleton proteins is involved in regulating and stabilizing actin microfilaments. (wiley.com)
- The regulatory properties of tropomyosin are mediated by its interactions with muscle-specific tropomyosin binding proteins. (rice.edu)
- Biosensors studies of tropomyosin interacting with caldesmon and troponin measured association rate, dissociation rate, and equilibrium rate constants of these proteins for the first time. (rice.edu)
- Modeling the structural changes of the whole thin filament due to Ca2+-activation was systematically performed using the crystallographic data of constituent molecules (actin, tropomyosin and troponin core domain) as starting points in order to determine the structural changes of the regulatory proteins and actin. (nih.gov)
- A key regulator of actin filament specialization is the tropomyosin family of actin-associating proteins. (edu.au)
- anti-Tropomyosin, Mouse monoclonal to Tropomyosin, Isotype IgG1 mus musculus murine anti-Tropomyosin, Mouse monoclonal to Tropomyosin, Isotype IgG1 detects proteins from variouse species most likely human. (antibody-antibodies.com)
- The abundances of transcripts of genes predicted to code for different proteins forming contractile muscle components, including actin, troponin and tropomyosin, were significantly different between seasons and thus between physiological states. (biologists.org)
- These tropomyosin and myosin conformational studies also provide basic information about folding intermediates and assembly mechanisms applicable to other proteins with similar coiled-coil structures. (grantome.com)
- The calcium-bound tropomyosin doesn't go anywhere, but as calcium is quickly pumped into the SR or buffered up by calcium-binding proteins, troponin is no longer bound to calcium, allowing tropomyosin to block the myosin binding sites. (stackexchange.com)
- Troponin is a complex of three proteins ( Troponin-T, Troponin-C and Troponin-I ). Troponin-T mediates tropomyosin binding. (wikiversity.org)
- Pathogenesis of most myopathies including inherited hypertrophic (HCM) and dilated (DCM) cardiomyopathies is based on modification of structural state of contractile proteins induced by point mutations, such as mutations in alpha-tropomyosin (TM). (ox.ac.uk)
- The cMyBP-C hypertrophic cardiomyopathy variant L348P enhances thin filament activation through an increased shift in tropomyosin (zeige TPM2 Antikörper ) position. (antikoerper-online.de)
- Mechanisms of thin filament assembly in embryonic chick cardiac myocytes: tropomodulin requires tropomyosin for assembly. (rupress.org)
- This observation, together with results obtained using a novel permeabilized cell model for thin filament assembly, indicate that tropomodulin assembly is dependent on the prior association of tropomyosin with actin filaments. (rupress.org)
- Chains of tropomyosin molecules are arranged end to end along the actin thin filament. (blogspot.com)
- troponin and tropomyosin cooperatively block the interaction of cross-bridges with the thin filament. (blogspot.com)
- Actin-tropomyosin activation of myosin subfragment 1 ATPase and thin filament cooperativity. (mpg.de)
- Fluorescence measurements of probes attached to cysteine groups of tropomyosin, will be used to monitor the cooperative change in state of tropomyosin associated with myosin subfragment 1 binding to the thin filament. (grantome.com)
- Nonmuscle tropomyosin isoforms function in all cells, both muscle and nonmuscle cells, and are involved in a range of cellular pathways that control and regulate the cell's cytoskeleton and other key cellular functions. (wikipedia.org)
- The contractile system relies upon 4 actin filament isoforms and 5 tropomyosin isoforms, whereas the actin filament system of the cytoskeleton uses two actin filament isoforms and over 40 tropomyosin isoforms. (wikipedia.org)
- One type of genetically-driven cancer is called tropomyosin receptor kinase (TRK) fusion cancer. (bayer.com)
- The aim of this study was to examine effects of exercise preconditioning on neuronal cell death and expression of neurotrophin-4 (NT-4) and tropomyosin receptor kinase B (TrkB) in the hippocampal CA1 region following transient global cerebral ischemia/reperfusion in rat. (magiran.com)
- Response to: 'Role of nerve growth factor (NGF) and tropomyosin receptor kinase A (TrkA) in the pathogenesis of osteoarthritis. (bmj.com)
- Importantly, compulsive alcohol intake was reversed by overexpression of the wild-type valine68BDNF allele in the ventromedial prefrontal cortex of the Met68BDNF mice or by systemic administration of the tropomyosin receptor kinase B agonist, LM22A-4. (nih.gov)
- Our findings suggest that carrying this BDNF allele increases the risk of developing uncontrolled and excessive alcohol drinking that can be reversed by directly activating the BDNF receptor, tropomyosin receptor kinase B. Importantly, this work identifies a potential therapeutic strategy for the treatment of compulsive alcohol drinking in humans carrying the Met66BDNF allele. (nih.gov)
- Our aim was to map the immunodominant regions of shrimp tropomyosin by both IgE-binding and IgE-receptor crosslinking studies. (figshare.com)
- Oncogenes derived from the neurotrophin receptor tropomyosin-related kinase TrkA act as drivers in sub-populations of a wide-range of human cancers. (biomedcentral.com)
- The biological activity of neurotrophins stems from their binding to two membrane receptor types, the tropomyosin receptor kinase and the p75 neurotrophin receptors (NRs). (nih.gov)
- Schematic picture of tropomyosin receptor kinases (Trks) and the p75 neurotrophin receptors (p75NTR). (nih.gov)
- The Wikipedia pages for muscle contraction , tropomyosin , voltage-gated calcium channel , and ryanodine receptor can all be helpful. (stackexchange.com)
- Molecular and immunological approaches in quantifying the air-borne food allergen tropomyosin in crab processing facilities. (elisakits.co.uk)
- Sera from individual patients with chronic S. mansoni infection, but not S. haematobium, S. japonicum , parasitic infections other than schistosomiasis, and without infection reacted with the recombinant tropomyosin. (ajtmh.org)
- The recombinant tropomyosin was then extensively tested using specific competition for IgE binding against extracts of other crustacean species, house dust mite and cockroach. (diva-portal.org)
- Three- to 4-week-old BALB/c mice were sensitized by intragastric administration of recombinant tropomyosin (0.1 mg) plus cholera toxin (10 μg) on days 0, 12, 19 and 26 and challenged on day 33. (elsevier.com)
Smooth muscle tropomyosin2
- Structural analysis of smooth muscle tropomyosin α and β isoforms. (sigmaaldrich.com)
- The tendency of smooth muscle tropomyosin to form semi-rigid polymers with continuous and undampened rigidity may compensate for the lack of troponin -based structural support in smooth muscles. (antikoerper-online.de)
- Within mammals, four genes are responsible for generating more than 40 different tropomyosin isoforms. (wikipedia.org)
- A vast array of tropomyosin isoforms are generated by using a combination of different genes and alternative splicing. (wikipedia.org)
- A cDNA clone encoding a 253 amino acid tropomyosin was isolated from Hydra in a differential screen for headspecific genes. (uni-muenchen.de)
- The four known tropomyosin genes have highly conserved DNA and amino acid sequences, and at least 18 isoforms are generated by alternative RNA splicing in muscle and non-muscle cells. (edu.au)
Properties of tropomyosin2
- 3 Because of the remote possibility that these α-tropomyosin mutations are only linked polymorphisms, further evidence demonstrating a cause-effect relation with hypertrophic cardiomyopathy would be desirable. (ahajournals.org)
- We have investigated the effect of the E41K, R91G, and E139del β-tropomyosin (TM) mutations that cause congenital myopathy on the position of TM and orientation of actin monomers and myosin heads at different mimicked stages of the ATPase cycle in troponin-free ghost muscle fibers by polarized fluorimetry. (ox.ac.uk)
- Mutations in tropomyosin 4 underlie a rare form of human macrothrombocytopenia. (duhnnae.com)
- Methods and Results The presence or absence of an α-tropomyosin mutation and the haplotypes of the flanking chromosomal regions were determined for members of a family with hypertrophic cardiomyopathy. (ahajournals.org)
- One parental chromosome was transmitted to two offspring: one bearing the Asp175Asn mutation (the affected proband) and one clinically unaffected sibling who lacked the α-tropomyosin mutation. (ahajournals.org)
- Depending on which promoter and initial exon used, the tropomyosin isoforms can be categorized as either high-molecular-weight (HMW, 284 amino acids) or low-molecular-weight (LMW, 248). (wikipedia.org)
- Maytum R, Bathe F, Konrad M, Geeves MA: Tropomyosin exon 6b is troponin-specific and required for correct acto-myosin regulation. (biomedcentral.com)
- Synthetic peptide within Human Tropomyosin 1 (alpha) aa 20-69 (N terminal). (abcam.co.jp)
- Ultracentrifugal studies of mixtures of aldolase and the troponin-tropomyosin complex from bovine muscle showed the existence of a labile interaction between these two myofibrillar constituents in imidazole buffers, pH6.8, I 0.02-0.10 (mol/l), and the suppression of the reaction by fructose 1,6-diphosphate. (biochemj.org)
- Analysis of the sedimentation-velocity patterns suggests the binding of more than 2 molecules of troponin-tropomyosin/molecule of aldolase. (biochemj.org)
- Troponin T-Attaches troponin complex to Tropomyosin Troponin I-Binds troponin complex to actin Troponin C-Calcium binding troponin Tropomyosin Covers the sites where myosin heads bind actin. (masterofmedicine.com)
- Troponin-Tropomyosin complex inhibits the interaction between actin and myosin in a resting muscle. (masterofmedicine.com)
- Calcium is released from SR in response to action potential and it binds to troponin C and causes conformational change in Troponin-Tropomyosin -Actin unit , myosin binding sites become uncovered leading to muscle contraction. (masterofmedicine.com)
- Tropomyosins are often categorised into two groups, muscle tropomyosin isoforms and nonmuscle tropomyosin isoforms. (wikipedia.org)
- We have found that a nonmuscle tropomyosin isolated from the intestinal epithelium can directly stabilize actin filaments by slowing depolymerization from the pointed, or slow-growing, filament end. (mblwhoilibrary.org)
- Microtiter Plate: Coated with anti-tropomyosin antibodies. (elisakits.co.uk)
- Equilibrium of the actin-tropomyosin interaction. (nih.gov)
- When the muscle is at rest, the tropomyosin molecule covers the binding site of the actin molecule, where interaction with myosin occurs. (oup.com)
- Our results are consistent with previous predictions based on electrostatic interaction energy landscapes determined by rigid-body translocation of tropomyosin. (rupress.org)
- Deciphering the design of the tropomyosin molecule. (springer.com)
- We suggest that the troponin movements and the structural changes within actin molecule upon activation are also crucial components of the regulation mechanism in addition to the steric blocking movement of tropomyosin. (nih.gov)
- The development of novel small molecule inhibitors of the cancer-associated tropomyosin 3.1 (Tpm3.1) provides the ability to examine the metabolic function of specific actin filament populations. (garvan.org.au)
- Tropomyosin is a rod-shaped molecule composed of two intertwined polypeptides with a length approximately equal to that of seven actin molecules. (blogspot.com)
- These tropomyosin molecules partially cover the myosin-binding site on each actin molecule, thereby preventing the cross-bridges from making contact with actin. (blogspot.com)
- One molecule of troponin binds to each molecule of tropomyosin and regulates the access to myosin-binding sites on the seven actin molecules in contact with tropomyosin. (blogspot.com)
- The binding of calcium produces a change in the shape of troponin, which through troponin's linkage to tropomyosin, drags tropomyosin away from the myosin-binding site on each actin molecule. (blogspot.com)
- Within the muscle sarcomere, each tropomyosin molecule spans approximately __________ globular (G) actin molecules. (physiologyweb.com)
- WB analysis of extracts of various tissues using Tropomyosin 3 antibody. (genetex.com)
- IHC-P analysis of human kidney using Tropomyosin 3 antibody at a dilution of 1:200. (genetex.com)
- ICC/IF analysis of HeLa cells using Tropomyosin 3 antibody (green) and DAPI (blue). (genetex.com)
- Quantification of the major brown shrimp allergen Pen a 1 (tropomyosin) by a monoclonal antibody-based sandwich ELISA. (elisakits.co.uk)
- Description anti-Tropomyosin, Mouse monoclonal to Tropomyosin, Isotype IgG1 is a monoclonal antibody which is greatly purified and with high binding affinity for the antigen that it is risen against. (antibody-antibodies.com)
- Justin G. Lees, Yu Wooi Ching, Damian H. Adams, Cuc T.T. Bach, Michael S. Samuel, Anthony J. Kee, Edna C. Hardeman, Peter Gunning, Allison J. Cowin and Geraldine M. O'Neill.Tropomyosin Regulates Cell Migration during Skin Wound Healing. (edu.au)
- In vitro citrullinated tropomyosin significantly enhance affinity for F-actin (p=0.001) and decrease in the ATPase activity (p=0.06). (ahajournals.org)
- Caldesmon bound with similar affinity to several tropomyosin isoforms while troponin bound most tightly to striated muscle tropomyosin. (rice.edu)
- anti-Tropomyosin, Mouse monoclonal to Tropomyosin, Isotype IgG1 immunoglobuline1 The anti-Tropomyosin, Mouse monoclonal to Tropomyosin, Isotype IgG1 is very stable with a high affinity. (antibody-antibodies.com)
Skeletal muscle tropomyosin1
- Unique functional properties of slow skeletal muscle tropomyosin. (illumina.com)
- To enable cross-bridges to bind to actin and begin cycling, tropomyosin molecules must be moved away from their blocking positions on actin. (blogspot.com)
- Specifically, the measurements will be used to: show that the tropomyosin state is correlated with acto-myosin subfragment 1 ATPase activity, clarify the role of the two heads of myosin, determine the influence of the cardiac and skeletal troponin components on the tropomyosin state, verify that tropomyosin states, and determine the differences in behavior of smooth and striated muscle tropomyosins. (grantome.com)
Sensitized with recombinant1
- Here, we investigated the immediate hypersensitivity responses, IgE and cell-mediated immune response in mice sensitized with recombinant shrimp tropomyosin. (elsevier.com)
- Tropomyosin, in association with the troponin complex, plays a central role in the calcium dependent regulation of muscle contraction. (uniprot.org)
- In muscle cells, tropomyosin is subject to calcium regulation, but its regulation in nonmuscle cells is not understood. (rupress.org)
- Interactions of calcium and native tropomyosin with myosin and heavy meromyosin. (semanticscholar.org)
- This happens when calcium binds to specific binding sites on troponin (not tropomyosin). (blogspot.com)
- Also, where exactly is the tropomyosin going after it binds with calcium ions? (stackexchange.com)
- Calcium concentrations are very low in the muscle cell at rest, but high within the sarcoplasmic reticulum so calcium rushes through and some of it binds with troponin (not tropomyosin itself, but they are associated/attached with one another), which releases the hold of tropomyosin on the actin filament. (stackexchange.com)
- Tropomyosin (TM) plays a central role in calcium mediated striated muscle contraction. (elsevier.com)
- In diabetes, expression of high molecular weight (HMW) isoforms from tropomyosin 1 (TPM1 (show TPM1 ELISA Kits )) were markedly decreased but HMW isoforms from tropomyosin 4 (TPM4 ) were not significantly different. (antibodies-online.com)
- TPM4 belongs to the tropomyosin family. (biomol.com)
- A DNA sequence encoding the Homo sapiens (Human) TPM4 / Tropomyosin 4, was expressed in the hosts and tags indicated. (enquirebio.com)
Role of tropomyosin2
- Two conformational states of didansylcystine-labeled rabbit cardiac tropomyosin. (springer.com)
- Tropomyosin plays a central role in the regulation of skeletal, cardiac, and smooth muscle regulation. (rice.edu)
- The structures and interactions of tropomyosin with caldesmon, skeletal troponin, and cardiac troponin have been studied using X-ray crystallography and optical biosensors. (rice.edu)
- The structure of cocrystals of skeletal and cardiac troponin subunit T revealed that the two isoforms interacted with tropomyosin in the same general area but that cardiac troponin T bound to tropomyosin over a more extended region. (rice.edu)
- A cDNA that encodes Schistosoma mansoni tropomyosin, except for 10 amino acids at the amino terminus, has been cloned into a pOTSNCO plasmid vector. (ajtmh.org)
- F-actin-tropomyosin binding, tropomyosin-actin-myosin, actin-myosin and myosin ATPase activity assays, and F-actin stability assays were carried out. (ahajournals.org)
- Dispositional changes of actin, tropomyosin and the troponin core domain in the best-fit models. (nih.gov)
- Binding of troponin I and the troponin I-troponin C complex to actin-tropomyosin. (grantome.com)
- In addition, shrimp tropomyosin-specific CD4+ T cells, interleukin-4 and interferon-γ levels were determined from in vitro splenocyte cultures. (elsevier.com)
- Results: Mice fed with shrimp tropomyosin developed swelling of the snout, increased scratching behavior and shrimp tropomyosin-specific IgE. (elsevier.com)
- Shrimp tropomyosin-specific CD4+ T cell proliferations and elevated interleukin-4 over interferon-γ levels were evident in splenocyte cultures of tropomyosin-fed mice upon tropomyosin stimulation. (elsevier.com)
- In contrast, shrimp tropomyosin-specific IgE, CD4+ T cells and hypersensitive responses were absent in the control mice. (elsevier.com)
- Muscle isoforms of tropomyosin are characterised by having 284 amino acid residues and a highly conserved N-terminal region, whereas non-muscle forms are generally smaller and are heterogeneous in their N-terminal region. (embl.de)
- Tropomyosin: Amino acid sequence and coiled-coil structure. (springer.com)
- Stone D, Smillie LB. The amino acid sequence of rabbit skeletal alpha-tropomyosin. (springer.com)
- Conclusions Tropomyosin T‐cell cross‐reactivity, unlike IgE cross‐reactivity, is dependent on structural stability rather than amino acid sequence similarity. (edu.au)
- The deduced amino acid sequence of cloned cDNA was identical with that of Periplaneta americana tropomyosin (98.5% nucleotide sequence identity). (yonsei.ac.kr)
- The species specificity of S. mansoni tropomyosin suggests that further study of its potential as an immunodiagnostic reagent is warranted. (ajtmh.org)
Rabbit skeletal muscle1
- Analysis of the primary sequence of alpha-tropomyosin from rabbit skeletal muscle. (springer.com)
- Muscle tropomyosin isoforms are involved in regulating interactions between actin and myosin in the muscle sarcomere and play a pivotal role in regulated muscle contraction. (wikipedia.org)
- McLachlan AD, Stewart M. Tropomyosin coiled-coil interactions: evidence for an unstaggered structure. (springer.com)
- Auf www.antikoerper-online.de finden Sie aktuell 83 Tropomyosin 1 (Alpha) (TPM1) Antikörper von 19 unterschiedlichen Herstellern. (antikoerper-online.de)
- Tropomyosin 4 defines longitudinal filaments in mouse models of muscular dystrophy and nemaline myopathy. (antibodies-online.com)
- Tropomyosin (Tpm) isoforms are the master regulators of the functions of individual actin filaments in fungi and metazoans. (biologists.org)
- Direct observation of tropomyosin binding to actin filaments. (semanticscholar.org)
- Tropomyosin stabilizes the pointed end of actin filaments by slowing depolymerization. (mblwhoilibrary.org)
- Tropomyosin is postulated to confer stability to actin filaments in nonmuscle cells. (mblwhoilibrary.org)
- Thin filaments contain Troponin and Tropomyosin which prevent myosin binding in the absence of Ca 2+ . (wikiversity.org)
- Studies of the structure and dynamics of tropomyosin, accompanied by biochemical and biophysical analyses of tropomyosin, mutants and model peptides, have revealed the complexity and subtleties required for tropomyosin function. (springer.com)