HHsearch alignment for GI: 254780794 and conserved domain: TIGR00456

>TIGR00456 argS arginyl-tRNA synthetase; InterPro: IPR001278 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 . Arginyl-tRNA synthetase (6.1.1.19 from EC) has been crystallized and preliminary X-ray crystallographic analysis of yeast arginyl-tRNA synthetase-yeast tRNAArg complexes is available . ; GO: 0000166 nucleotide binding, 0004814 arginine-tRNA ligase activity, 0005524 ATP binding, 0006412 translation, 0006420 arginyl-tRNA aminoacylation, 0005737 cytoplasm.
Probab=90.02  E-value=0.53  Score=26.80  Aligned_cols=45  Identities=27%  Similarity=0.424  Sum_probs=29.4

Q ss_pred             CCCEEE--EEECCCCCCCHHHHHHHHHH--HHHHHHHCCCCE--EEEEEEH
Q ss_conf             888789--60158967810557988999--999985059958--9997311
Q gi|254780794|r    4 SDNLFV--SGVQPTGVLHLGNYLGMIRN--VIRRQETCNHLG--MYFIADL   48 (355)
Q Consensus         4 ~~~~vl--tG~~PtG~~HLG~y~g~i~~--~i~lq~~~~~~~--~~~IAD~   48 (355)
T Consensus       117 ~~ki~~EfsSaNp~gplH~GHlR~aiIGD~L~r~l~~~G~~V~r~yyVND~  167 (600)
T TIGR00456       117 SKKIIIEFSSANPAGPLHIGHLRNAIIGDSLARILEFLGYDVIREYYVNDW  167 (600)
T ss_pred             CEEEEEEEECCCCCCCCCHHHHHHHHHHHHHHHHHHHCCCCEEEEEEECCH
T ss_conf             707999876588897611000025777889999998759707985200542