Summary: tRNA synthetases class I (W and Y)
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tRNA synthetases class I (W and Y) Provide feedback
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Doublie S, Bricogne G, Gilmore C, Carter CW Jr; , Structure 1995;3:17-31.: Tryptophanyl-tRNA synthetase crystal structure reveals an unexpected homology to tyrosyl-tRNA synthetase. PUBMED:7743129 EPMC:7743129
Internal database links
|Similarity to PfamA using HHSearch:||tRNA-synt_1f|
External database links
This tab holds annotation information from the InterPro database.
InterPro entry IPR002305
The aminoacyl-tRNA synthetases (EC) catalyse the attachment of an amino acid to its cognate transfer RNA molecule in a highly specific two-step reaction. These proteins differ widely in size and oligomeric state, and have limited sequence homology [PUBMED:2203971]. The 20 aminoacyl-tRNA synthetases are divided into two classes, I and II. Class I aminoacyl-tRNA synthetases contain a characteristic Rossman fold catalytic domain and are mostly monomeric [PUBMED:10673435]. Class II aminoacyl-tRNA synthetases share an anti-parallel beta-sheet fold flanked by alpha-helices [PUBMED:8364025], and are mostly dimeric or multimeric, containing at least three conserved regions [PUBMED:8274143, PUBMED:2053131, PUBMED:1852601]. However, tRNA binding involves an alpha-helical structure that is conserved between class I and class II synthetases. In reactions catalysed by the class I aminoacyl-tRNA synthetases, the aminoacyl group is coupled to the 2'-hydroxyl of the tRNA, while, in class II reactions, the 3'-hydroxyl site is preferred. The synthetases specific for arginine, cysteine, glutamic acid, glutamine, isoleucine, leucine, methionine, tyrosine, tryptophan and valine belong to class I synthetases. The synthetases specific for alanine, asparagine, aspartic acid, glycine, histidine, lysine, phenylalanine, proline, serine, and threonine belong to class-II synthetases [PUBMED:]. Based on their mode of binding to the tRNA acceptor stem, both classes of tRNA synthetases have been subdivided into three subclasses, designated 1a, 1b, 1c and 2a, 2b, 2c.
The class Ia aminoacyl-tRNA synthetases consist of the isoleucyl, methionyl, valyl, leucyl, cysteinyl, and arginyl-tRNA synthetases; the class Ib include the glutamyl and glutaminyl-tRNA synthetases, and the class Ic are the tyrosyl and tryptophanyl-tRNA synthetases [PUBMED:11590011].
The mapping between Pfam and Gene Ontology is provided by InterPro. If you use this data please cite InterPro.
|Cellular component||cytoplasm (GO:0005737)|
|Molecular function||ATP binding (GO:0005524)|
|nucleotide binding (GO:0000166)|
|aminoacyl-tRNA ligase activity (GO:0004812)|
|Biological process||tRNA aminoacylation for protein translation (GO:0006418)|
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The HUP class contains the HIGH-signature proteins, UspA superfamily and the PP-ATPase superfamily . The HIGH superfamily has the HIGH Nucleotidyl transferases and the class I tRNA synthetases both of which have the HIGH and the KMSKS motif ,. The PP-loop ATPase named after the ATP PyroPhosphatase domain, was initially identified as a conserved amino acid sequence motif in four distinct groups of enzymes that catalyse the hydrolysis of the alpha-beta phosphate bond of ATP, namely GMP synthetases, argininosuccinate synthetases, asparagine synthetases, and ATP sulfurylases . The USPA superfamily contains USPA, ETFP and Photolyases 
The clan contains the following 26 members:Arginosuc_synth Asn_synthase ATP-sulfurylase ATP_bind_3 ATP_bind_4 Citrate_ly_lig CTP_transf_2 DNA_photolyase ETF FAD_syn HIGH_NTase1 NAD_synthase Pantoate_ligase PAPS_reduct QueC ThiI tRNA-synt_1 tRNA-synt_1_2 tRNA-synt_1b tRNA-synt_1c tRNA-synt_1d tRNA-synt_1e tRNA-synt_1f tRNA-synt_1g tRNA_Me_trans Usp
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Curation and family details
|Seed source:||MRC-LMB Genome group|
|Author:||Bateman A, Griffiths-Jones SR|
|Number in seed:||40|
|Number in full:||11971|
|Average length of the domain:||279.10 aa|
|Average identity of full alignment:||24 %|
|Average coverage of the sequence by the domain:||74.98 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 23193494 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||20|
|Download:||download the raw HMM for this family|
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There are 3 interactions for this family. More...
We determine these interactions using iPfam, which considers the interactions between residues in three-dimensional protein structures and maps those interactions back to Pfam families. You can find more information about the iPfam algorithm in the journal article that accompanies the website.
For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the tRNA-synt_1b domain has been found. There are 203 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein seqence.
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