>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=99.03 E-value=3.8e-09 Score=81.48 Aligned_cols=195 Identities=17% Similarity=0.225 Sum_probs=126.6 Q ss_pred CCCCCCCCCCHHHHHH--HHHHHHCCCCCEEEEECCCCCEECCCCCCHHCCCCCCCCHHHHHC----------------- Q ss_conf 0025544421112455--444331178400001303782621345300001234433366411----------------- Q gi|254780445|r 589 VYLEGSDQHRGWFQHS--LLESCATRGSTPFTSLITHGFSVDENGEKMSKSKGNVVFPEEIIS----------------- 649 (963) Q Consensus 589 ~~~eG~Dq~RgWF~s~--ll~~~~~~~~~Pfk~v~~hG~vld~~G~KMSKS~GNvi~p~~ii~----------------- 649 (963) T Consensus 353 i~V~gsdh~-~h~~q~~~~~e~LG~~~~~~~L~~~~f~~v~~~~GKkmkTR~G~~i~ld~ll~e~~~RA~~~~~~~~~~~ 431 (600) T TIGR00456 353 IYVWGSDHK-LHIAQVFAILEKLGYLSKKKELEHLEFGMVPLGSGKKMKTRRGNVISLDNLLDEASKRAGNVITKRNTDL 431 (600) T ss_pred EEEEECCHH-HHHHHHHHHHHHCCCCCCCCCEEEEEEEEEECCCCCCCCCCCCCCEEHHHHHHHHHHHHHHHHHHHHCCC T ss_conf 987405188-8999999999971653788616899876432578885434556602234468999999999996110135 Q ss_pred -----------CCCHHHHHHHHHHCCCCCCCCCCCH-HHHHHHH--------HHHHHCCCCCCCCCCCCCCCCC---CCC Q ss_conf -----------3675788788871787665544310-2567776--------4000001100000122444456---731 Q gi|254780445|r 650 -----------ESGADVLRYWAVNSDYHDDQRLGKN-IIQTNID--------TYRKLRNTIRWMLGMLAHDTGN---EPS 706 (963) Q Consensus 650 -----------~yGaD~lR~~~~~~~~~~d~~~~~~-~l~~~~~--------~~~kl~Nt~rf~l~~l~~~~~~---~~~ 706 (963) T Consensus 432 ~~~e~~e~~a~~vG~gAvry~~l~~~~~~~~~Fd~d~~~L~f~~n~~pY~QYAhaR~~Silr----~~~~~~~~~~~~~~ 507 (600) T TIGR00456 432 EQDEAEEKVADAVGIGAVRYADLSKNRETHYVFDWDTAMLSFEGNTAPYIQYAHARICSILR----KKAEIDGEKLIADD 507 (600) T ss_pred CCCCHHHHHHHHHHHHHHHHHHHHHCCCCCCEEECCCHHHCCCCCCCCHHHHHHHHHHHHHH----HHCCCCHHHHHHHH T ss_conf 22203789999973679999999727898815501201111578874325888999999876----31023313455320 Q ss_pred HHHH-HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCHHHCCCHHHCCCCC---CCHHHHHHHHHHH Q ss_conf 0111-27888754368999999889876540122668899878630240010102012227899---8089999999999 Q gi|254780445|r 707 LADM-PALEQLMLHRLTELDQVVREAYDAFNFKEVVRQLTNFSNAELSSFYFDIRKDSLYCDSP---SSLKRLSSIAVIR 782 (963) Q Consensus 707 ~~~l-~~~DkwiLskl~~~i~~v~~~~e~~~f~~a~~~i~~F~~~dLS~~Yld~~Kdrly~~~~---~s~~R~s~~~~L~ 782 (963) T Consensus 508 ~~~~~~~~E~~L~~~L~~fp~~~~~~~~~~~p~~l~~Yly~LA-~~F~sfY~-~~~v---~~~~~~~~~~~RL~L~~~~~ 582 (600) T TIGR00456 508 FLLLKEEKEKELLKLLLQFPEVIEEAAEEREPHVLTNYLYELA-KLFSSFYK-ACPV---LDAENEELAKARLALLKATR 582 (600) T ss_pred CCCCCCHHHHHHHHHHHHHHHHHHHHHHHCCCHHHHHHHHHHH-HHHHHHHH-CCCC---CCCCCHHHHHHHHHHHHHHH T ss_conf 0036888899999998564899999998547188899999997-76423664-1778---89862668999999999999 Q ss_pred HHHHHHHHHHC Q ss_conf 99999999970 Q gi|254780445|r 783 ILCRHLIIWIA 793 (963) Q Consensus 783 ~il~~l~~lLa 793 (963) T Consensus 583 ~~L~n~L~LLG 593 (600) T TIGR00456 583 QTLKNGLELLG 593 (600) T ss_pred HHHHHHHHHHC T ss_conf 99999887608

HHsearch alignment for GI: 254780445 and conserved domain: TIGR00456