>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=97.72  E-value=1.1e-05  Score=56.84  Aligned_cols=110  Identities=21%  Similarity=0.268  Sum_probs=72.8

Q ss_pred             CEEEEECCCCCCCCCCCCHHHHHHHHHHHHHHHHHCCCCCCCCCCCCCCCHHHHHHHHHHCCCHH--HHHHHHHHHHHHH
Q ss_conf             38998077897898740047797789999997771898556768814020589999998099999--9999999999999
Q gi|254780802|r   35 KYFVLEMFPYPSGNIHMGHLRNYVIGDVVARFMRASGYSVLHPMGWDAFGMPAENAAREHNVHPK--MWTYQNIKVMRKQ  112 (869)
Q Consensus        35 kf~i~~~pPy~nG~lHiGH~~~~t~~Dv~aRy~rm~G~~Vl~~~G~d~~GlPie~~~~e~~~~~~--~~~~~~i~~~k~~  112 (869)
T Consensus       100 G~VV~RFaPnPsGpLhiGhArAa~lN~~fa~~Y--~GklIlR~d----------------DTdP~tkr~~~Eayd~i~eD  161 (600)
T TIGR00463       100 GEVVMRFAPNPSGPLHIGHARAAILNQYFAKKY--EGKLILRFD----------------DTDPRTKRVKPEAYDMILED  161 (600)
T ss_pred             CCEEEECCCCCCCCCCHHHHHHHHHHHHHHHHC--CCCEEEEEE----------------CCCCCCCCCCHHHHHHHHHH
T ss_conf             735773185454587523354223204668541--881799975----------------58788788872466524877


Q ss_pred             HHHCCCEEECCCCEECCC--HHHHHHHHHHHHHHHHCCCEEECCEEEECCCCCCCCCCHHHHHCCC
Q ss_conf             998191766469821477--3599999999999998896341221332147767677898984385
Q gi|254780802|r  113 LQSIGLSIDWSKDFATCD--VDYYHCQQLLFLDFMKHNVIVRKTAQVNWDPVEQTVLANEQVINGR  176 (869)
Q Consensus       113 ~~~lG~~~DW~r~y~T~d--~~y~~~v~w~f~~L~~kGliyrg~~pV~wcp~~~t~la~~Ev~~g~  176 (869)
T Consensus       162 LdwLG~k~D--ev~y~Sdr~~~yYdY---------~~kLIe~G~A---Y~C~c~~Eefre~r~~G~  213 (600)
T TIGR00463       162 LDWLGVKGD--EVVYQSDRIEIYYDY---------ARKLIEMGKA---YVCDCSPEEFRELRNKGV  213 (600)
T ss_pred             HHHCCCCEE--EEEEEECCHHHHHHH---------HHHHHHCCCC---EECCCCCHHHHHHHCCCC
T ss_conf             875284200--689830530156899---------9999866983---432798446888633888