>TIGR00463 gltX_arch glutamyl-tRNA synthetase; InterPro: IPR004526 The aminoacyl-tRNA synthetases (6.1.1. from 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 . 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 . Class II aminoacyl-tRNA synthetases share an anti-parallel beta-sheet fold flanked by alpha-helices , and are mostly dimeric or multimeric, containing at least three conserved regions , , . 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; these synthetases are further divided into three subclasses, a, b and c, according to sequence homology. The synthetases specific for alanine, asparagine, aspartic acid, glycine, histidine, lysine, phenylalanine, proline, serine, and threonine belong to class-II synthetases . Glutamyl-tRNA synthetase (6.1.1.17 from EC) is a class Ic synthetase and shows several similarities with glutaminyl-tRNA synthetase concerning structure and catalytic properties. It is an alpha2 dimer. To date one crystal structure of a glutamyl-tRNA synthetase (Thermus thermophilus) has been solved. The molecule has the form of a bent cylinder and consists of four domains. The N-terminal half (domains 1 and 2) contains the 'Rossman fold' typical for class I synthetases and resembles the corresponding part of E. coli GlnRS, whereas the C-terminal half exhibits a GluRS-specific structure . ; GO: 0000166 nucleotide binding, 0004818 glutamate-tRNA ligase activity, 0005524 ATP binding, 0006412 translation, 0006424 glutamyl-tRNA aminoacylation, 0005737 cytoplasm.

Probab=96.77  E-value=0.00061  Score=45.40  Aligned_cols=100  Identities=18%  Similarity=0.237  Sum_probs=53.1

Q ss_pred             EECCCCCCCCCCCHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCCCCCCHHHHHHHHHHHHCCCCHHHCCHHHHHHHHHHH
Q ss_conf             96282255889762157785668789987670898267888824442089999999876559983348999999999999
Q gi|254780445|r   58 LHDGPPYANGHIHIGHALNKILKDVIVRSFQMRNFNACFVPGWDCHGLPIEWKVENEYLAKGKKKDDIPVNEFRQACRDS  137 (963)
Q Consensus        58 l~dgPPy~nG~lH~GH~~n~~~kDi~~Ry~rm~G~~Vl~~~GwD~hGLPiE~~vek~l~~~~~~~~~~~~~~~~~~c~~~  137 (963)
T Consensus       103 V~RFaPnPsGpLhiGhArAa~lN~~fa~--~Y~GklIlR~dDTd----P------------~--tkr~~-----------  151 (600)
T TIGR00463       103 VMRFAPNPSGPLHIGHARAAILNQYFAK--KYEGKLILRFDDTD----P------------R--TKRVK-----------  151 (600)
T ss_pred             EEECCCCCCCCCCHHHHHHHHHHHHHHH--HCCCCEEEEEECCC----C------------C--CCCCC-----------
T ss_conf             7731854545875233542232046685--41881799975587----8------------8--78887-----------


Q ss_pred             HHHHHHHHHHHHHHCCEEEECCCCEECCCHHHHHHHHHHHHHHHHCCCEECCCCEEEECCC
Q ss_conf             9999999999999706077636981157767989999999999987961103430220574
Q gi|254780445|r  138 ASAWVKIQSKEFQRLGIVGDFENPYTTMTRESEAQIASELLKIAESDQIYRGIKPIMWSIA  198 (963)
Q Consensus       138 a~~~i~~~~~~~~rlG~~~Dw~~~y~T~dp~y~~~~~~~F~~l~~kGliyr~~~pV~w~p~  198 (963)
T Consensus       152 -~Eayd~i~eDLdwLG~k~D--e--v~y~Sdr~~~yYdY~~kLIe~G~AY-----~C~c~~  202 (600)
T TIGR00463       152 -PEAYDMILEDLDWLGVKGD--E--VVYQSDRIEIYYDYARKLIEMGKAY-----VCDCSP  202 (600)
T ss_pred             -HHHHHHHHHHHHHCCCCEE--E--EEEEECCHHHHHHHHHHHHHCCCCE-----ECCCCC
T ss_conf             -2466524877875284200--6--8983053015689999998669834-----327984