>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=93.54  E-value=0.034  Score=34.44  Aligned_cols=54  Identities=15%  Similarity=0.273  Sum_probs=35.2

Q ss_pred             CCCCCCC-CCCCCC--HH---HHHHHHHHHCCCCCCCCCC-CCCCHHCCCC-CCCCHHHHHHHHHCCCCCC
Q ss_conf             5301245-543210--13---5677766530121133786-8520000144-3100012255431245653
Q gi|254780933|r  540 TSVLVTG-FDILFF--WV---ARMMMMGLYFMKDAEGKGI-EPFHIVYMHA-LVRDKNGQKMSKSKGNVVD  602 (947)
Q Consensus       540 ~d~~~~G-~Di~r~--W~---~~~l~~~~~l~~~~~~~~~-~Pfk~v~~hG-~vld~~G~KMSKS~GNvid  602 (947)
T Consensus       214 vDD~lM~IThViRGedHisNTPkQI~iy~Al------g~~~iP---~f~H~p~I~~~~gKKLSKRdg~~~~  275 (513)
T TIGR00464       214 VDDYLMKITHVIRGEDHISNTPKQILIYKAL------GWKRIP---TFAHLPLILNEDGKKLSKRDGKTAT  275 (513)
T ss_pred             EECCCCCCCEEEECCHHHCCCHHHHHHHHHC------CCCCCC---CEEEEEEEECCCCCEEECCCCHHHH
T ss_conf             8533255451441202006718999999970------889888---1553535856988400120640257