>TIGR00464 gltX_bact glutamyl-tRNA synthetase; InterPro: IPR004527 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=97.10  E-value=0.0014  Score=44.50  Aligned_cols=89  Identities=31%  Similarity=0.389  Sum_probs=49.3

Q ss_pred             CCCCCCCCHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCCCCCHHHHHHHHHHHHHHCCCCHHHCCHHHHHHHHHHHHHHH
Q ss_conf             49999865437889677999998767089835677881545408999999997674599877779899999999999999
Q gi|254780933|r   46 PNVTGSLHMGHAFNTTIQDIMIRFERMRGKNVLWQPGTDHAGIATQITVESRLFAQSSLTREDIGRDAFIEKVWEWKKES  125 (947)
Q Consensus        46 P~~nG~lHiGH~~~~t~~Di~~Ry~rm~G~~Vl~~~G~D~~GlPiE~~vek~l~~~~~~~~~~~g~~~f~~~~~~~~~~~  125 (947)
T Consensus         8 PSPTG~LHiGg~RTAlFNyLfAr--~~~G~F~lRi--------------------------EDTD~e-------R~~~e~   52 (513)
T TIGR00464         8 PSPTGYLHIGGARTALFNYLFAR--HTGGKFILRI--------------------------EDTDLE-------RNIEEA   52 (513)
T ss_pred             CCCCCCCCHHHHHHHHHHHHHHH--HCCCCEEEEE--------------------------EECCCC-------CCCHHH
T ss_conf             88875435336899999999998--6389379987--------------------------536710-------072446


Q ss_pred             HHHHHHHHHHHCCEEECCC-CEEC--CCHHHHHHH-----HHHHHHHHHCCCEEE
Q ss_conf             9999999998083664279-8115--886799999-----999999998894331
Q gi|254780933|r  126 GGSILSQLKRLGASCDWSR-ERFT--MDEGMSNAV-----RNAFVVLYKDGLIYR  172 (947)
Q Consensus       126 ~~~~~~~~~~lG~~~Dw~r-~y~T--~d~~y~~~v-----~~~F~~L~~~gliy~  172 (947)
T Consensus        53 ~~~i~e~LkWlGi~wD--Es~~~gG~Y~Py-~QS~R~~~Y~~~~~~Ll~~g~AYr  104 (513)
T TIGR00464        53 EESILEGLKWLGISWD--ESVYVGGNYGPY-YQSQRLDIYKKYIKELLEEGLAYR  104 (513)
T ss_pred             HHHHHHHHHHCCCCCC--CCCCCCCCCEEE-HHHHHHHHHHHHHHHHHHCCCCEE
T ss_conf             8999988874586746--675689863011-101367899999999974599344