Archaeoglobales
Thermoplasmales
Gene Transfer, Horizontal
The naturally occurring transmission of genetic information between organisms, related or unrelated, circumventing parent-to-offspring transmission. Horizontal gene transfer may occur via a variety of naturally occurring processes such as GENETIC CONJUGATION; GENETIC TRANSDUCTION; and TRANSFECTION. It may result in a change of the recipient organism's genetic composition (TRANSFORMATION, GENETIC).
Operon
Evolution, Molecular
Molecular Sequence Data
Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.
Bacterial origin for the isoprenoid biosynthesis enzyme HMG-CoA reductase of the archaeal orders Thermoplasmatales and Archaeoglobales. (1/9)
The enzyme 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMG-CoA reductase or HMGR) fulfills an essential role in archaea, as it is required for the synthesis of isoprenoid ethers, the main component of archaeal cell membranes. There are two clearly homologous but structurally different classes of the enzyme, one found mainly in eukaryotes and archaea (class 1), and the other found in bacteria (class 2). This feature facilitated the identification of several cases of interdomain lateral gene transfer (LGT), in particular, the bacterial origin for the HMGR gene from the archaeon Archaeoglobus fulgidus. In order to investigate if this LGT event was recent and limited in its scope or had a broad and long-term impact on the recipient and its related lineages, the HMGR gene was amplified and sequenced from a variety of archaea. The survey covered close relatives of A. fulgidus, the only archaeon known prior to this study to possess a bacterial-like HMGR; representatives of each main euryarchaeal group were also inspected. All culturable members of the archaeal group Archaeoglobales were found to display an HMGR very similar to the enzyme of the bacterium Pseudomonas mevalonii. Surprisingly, two species of the genus Thermoplasma also harbor an HMGR of bacterial origin highly similar to the enzymes found in the Archaeoglobales. Phylogenetic analyses of the HMGR gene and comparisons to reference phylogenies from other genes confirm a common bacterial origin for the HMGRs of Thermoplasmatales and Archaeoglobales. The most likely explanation of these results includes an initial bacteria-to-archaea transfer, followed by a another event between archaea. Their presence in two divergent archaeal lineages suggests an important adaptive role for these laterally transferred genes. (+info)Characterisation of Archaeglobus fulgidus AlkA hypoxanthine DNA glycosylase activity. (2/9)
The AlkA protein from the archaebacterium Archaeglobus fulgidus was characterised with respect to release of hypoxanthine from DNA. The hypoxanthine glycosylase activity had optimal activity at 60 degrees C at pH 5.0. The enzyme released hypoxanthine from substrates with a preference for dI:dG >> dI:dT > dI:dC > dI:dA. The presence of a mismatch on either side of the dIMP in the substrate reduced excision efficiency of the hypoxanthine residue at neutral pH, while a mismatch on both sides of the dIMP resulted in total loss of excision. Release of hypoxanthine from DNA required a minimum of two bases on the 5' side and four bases on the 3' side of the dIMP residue. (+info)Structural and thermodynamic evidence for a stabilizing role of Nop5p in S-adenosyl-L-methionine binding to fibrillarin. (3/9)
In Archaea, fibrillarin and Nop5p form the core complex of box C/D small ribonucleoprotein particles, which are responsible for site-specific 2'-hydroxyl methylation of ribosomal and transfer RNAs. Fibrillarin has a conserved methyltransferase fold and employs S-adenosyl-l-methionine (AdoMet) as the cofactor in methyl transfer reactions. Comparison between recently determined crystal structures of free fibrillarin and fibrillarin-Nop5p-AdoMet tertiary complex revealed large conformational differences at the cofactor-binding site in fibrillarin. To identify the structural elements responsible for these large conformational differences, we refined a crystal structure of Archaeoglobus fulgidus fibrillarin-Nop5p binary complex at 3.5 A. This structure exhibited a pre-formed backbone geometry at the cofactor binding site similar to that when the cofactor is bound, suggesting that binding of Nop5p alone to fibrillarin is sufficient to stabilize the AdoMet-binding pocket. Calorimetry studies of cofactor binding to fibrillarin alone and to fibrillarin-Nop5p binary complex provided further support for this role of Nop5p. Mutagenesis and thermodynamic data showed that a cation-pi bridge formed between Tyr-89 of fibrillarin and Arg-169 of Nop5p, although dispensable for in vitro methylation activity, could partially account for the enhanced binding of cofactor to fibrillarin by Nop5p. Finally, assessment of cofactor-binding thermodynamics and catalytic activities of enzyme mutants identified three additional fibrillarin residues (Thr-70, Glu-88, and Asp-133) to be important for cofactor binding and for catalysis. (+info)Heat shock response of Archaeoglobus fulgidus. (4/9)
The heat shock response of the hyperthermophilic archaeon Archaeoglobus fulgidus strain VC-16 was studied using whole-genome microarrays. On the basis of the resulting expression profiles, approximately 350 of the 2,410 open reading frames (ORFs) (ca. 14%) exhibited increased or decreased transcript abundance. These span a range of cell functions, including energy production, amino acid metabolism, and signal transduction, where the majority are uncharacterized. One ORF called AF1298 was identified that contains a putative helix-turn-helix DNA binding motif. The gene product, HSR1, was expressed and purified from Escherichia coli and was used to characterize specific DNA recognition regions upstream of two A. fulgidus genes, AF1298 and AF1971. The results indicate that AF1298 is autoregulated and is part of an operon with two downstream genes that encode a small heat shock protein, Hsp20, and cdc48, an AAA+ ATPase. The DNase I footprints using HSR1 suggest the presence of a cis-binding motif upstream of AF1298 consisting of CTAAC-N5-GTTAG. Since AF1298 is negatively regulated in response to heat shock and encodes a protein only distantly related to the N-terminal DNA binding domain of Phr of Pyrococcus furiosus, these results suggest that HSR1 and Phr may belong to an evolutionarily diverse protein family involved in heat shock regulation in hyperthermophilic and mesophilic Archaea organisms. (+info)Conserved residues in the HAMP domain define a new family of proposed bipartite energy taxis receptors. (5/9)
(+info)Anaerobic oxidation of benzene by the hyperthermophilic archaeon Ferroglobus placidus. (6/9)
(+info)Crystallization and preliminary X-ray diffraction analysis of an archaeal tRNA-modification enzyme, TiaS, complexed with tRNA(Ile2) and ATP. (7/9)
(+info)Pyrosequencing reveals high-temperature cellulolytic microbial consortia in Great Boiling Spring after in situ lignocellulose enrichment. (8/9)
(+info)
WoRMS - World Register of Marine Species - Archaeoglobales
WoRMS - World Register of Marine Species - Ferroglobus placidus Hafenbradl, Keller, Dirmeier, Rachel, Rossnagel, Burggraf,...
Archaeoglobales
Geoglobus ahangari gen. nov., sp. nov., a novel hyperthermophilic archaeon capable of oxidizing organic acids and growing...
CAZy - Archaea
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Sequence Similarity
- 1LJO: CRYSTAL STRUCTURE OF AN SM-LIKE PROTEIN (AF-SM2) FROM ARCHAEOGLOBUS FULGIDUS AT 1.95A...
Archaeoglobus veneficus Huber & al., 1998
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Archaeoglobus
Order Archaeoglobales". In JT Staley; MP Bryant; N Pfennig; JG Holt (eds.). Bergey's Manual of Systematic Bacteriology, Volume ...
Ferroglobus
Order Archaeoglobales". In JT Staley; MP Bryant; N Pfennig; JG Holt (eds.). Bergey's Manual of Systematic Bacteriology, Volume ...
Geoglobus
Order Archaeoglobales". In JT Staley; MP Bryant; N Pfennig; JG Holt (eds.). Bergey's Manual of Systematic Bacteriology, Volume ...
Archaeoglobaceae
Order Archaeoglobales". In JT Staley; MP Bryant; N Pfennig; JG Holt (eds.). Bergey's Manual of Systematic Bacteriology. Vol. 3 ... Archaeoglobaceae are the only family in the order Archaeoglobales, which is the only order in the class Archaeoglobi. While all ... ISBN 978-0-387-98771-2. Huber H; Stetter KO (2001). "Order I. Archaeoglobales ord. nov.". In DR Boone; RW Castenholz (eds.). ... Archaeoglobaceae are a family of the Archaeoglobales. All known genera within the Archaeoglobaceae are hyperthermophilic and ...
Deep biosphere
Archaeoglobales and Thermococcales). A related clade, anaerobic methanotrophic archaea (ANME), is also represented. Other ...
Structural and thermodynamic evidence for a stabilizing role of Nop5p in S-adenosyl-L-methionine binding to fibrillarin
Code System Concept
DeCS
Pre GI: BLASTP Hits
Archaea Kingdom - Nature Kingdoms
Archaeoglobaceae archaeon
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Encyclopedia of Life
HAMAP
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Difference between revisions of "Geoglobus ahangari" - microbewiki
TREE NUMBER DESCRIPTOR
MeSH Browser
Archaeoglobales Preferred Term Term UI T058333. Date01/01/1999. LexicalTag NON. ThesaurusID NLM (1998). ... Archaeoglobales Preferred Concept UI. M0029108. Registry Number. txid2231. Related Numbers. txid2232. Scope Note. An order of ... Archaeoglobales. Tree Number(s). B02.200.080. Unique ID. D019608. RDF Unique Identifier. http://id.nlm.nih.gov/mesh/D019608 ...
MeSH Browser
Archaeoglobales Preferred Term Term UI T058333. Date01/01/1999. LexicalTag NON. ThesaurusID NLM (1998). ... Archaeoglobales Preferred Concept UI. M0029108. Registry Number. txid2231. Related Numbers. txid2232. Scope Note. An order of ... Archaeoglobales. Tree Number(s). B02.200.080. Unique ID. D019608. RDF Unique Identifier. http://id.nlm.nih.gov/mesh/D019608 ...
Seed Viewer - Subsystem
Archaea - Wikispecies
The taxa Regnum and Phylum are in use, but not covered by the Rules of Bacteriologocal Code (1990 Revision) (sources: NCBI, Bacterio.net). The category Candidatus is not covered by the Rules of Bacteriologocal Code (1990 Revision). A name included in the category Candidatus cannot be validly published, and it also cannot be designated sp. nov., gen. nov., etc. (source: Bacterio.net). ...