>TIGR00422 valS valyl-tRNA synthetase; InterPro: IPR002303 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 . Valyl-tRNA synthetase (6.1.1.9 from EC) is an alpha monomer that belongs to class Ia.; GO: 0000166 nucleotide binding, 0004832 valine-tRNA ligase activity, 0005524 ATP binding, 0006412 translation, 0006438 valyl-tRNA aminoacylation, 0005737 cytoplasm.

Probab=98.70 E-value=5.6e-07 Score=67.91 Aligned_cols=194 Identities=18% Similarity=0.253 Sum_probs=118.7 Q ss_pred HHHHHHHHHHC---C--CCCCCEEEECCHHHCCCCCCCCCCCCCCCCHHHHHHHHH------------------------ Q ss_conf 99999999722---6--634511531101101221100000122330245677777------------------------ Q gi|254780285|r 365 KRLEAVAAAVS---E--KKAQINVLLCELVRLYRDGMPIKMSKRAGDFITLRHVVD------------------------ 415 (586) Q Consensus 365 ~~v~~~~~~lg---~--~~~~~~~~~~~~v~l~~dg~~~kmstR~G~~v~l~dll~------------------------ 415 (586) T Consensus 551 RMi~~~~~~tgDEnGkP~~PFk~v~ihGLVRD-eqG~--KMSKSlGNvIdP~d~I~GI~L~dL~~K~~~~~l~P~~~eK~ 627 (970) T TIGR00422 551 RMILRSLALTGDENGKPQVPFKDVYIHGLVRD-EQGR--KMSKSLGNVIDPLDVIEGISLDDLLEKRTGNMLQPQLAEKI 627 (970) T ss_pred HHHHHHHHHHCCCCCCCCCCCEEEEECCEEEC-CCCC--CCCCCCCCCCCHHHHHCCCCCHHHHHHHHCCCCCHHHHHHH T ss_conf 99862155401358698878202586544555-8885--12220568347698606887078999974577783589998 Q ss_pred -------------HHHHHHHHHHHHHHCC--HHHHHHHHHHHHHHCCCCHHHHHH--HHHHHHHHHHHHHHHHCCCCCCC Q ss_conf -------------6321123455542000--123334477765320244367888--88888999987533200246832 Q gi|254780285|r 416 -------------EVGSDSVRFMMLWRKN--SELLDFDFCKVKEQSKENPVFYVQ--YAYARCRSIFRQAKDIFPDLDFD 478 (586) Q Consensus 416 -------------evg~~aiky~~L~~~~--~~~~~Fd~d~~l~~~~~nt~~Yiq--Ya~aR~~SIlrKa~~~~~~~~~~ 478 (586) T Consensus 628 ~~~~~~~fpnGI~~YGaDALR~~La~~~~G~G~Di~f~~~~v~~--~~n---F~NKlWNA~rF~l~~~~~~--~~~---- 696 (970) T TIGR00422 628 KKGTKKSFPNGIPKYGADALRFTLASLVTGPGDDINFDWKRVES--ARN---FANKLWNASRFVLMNLSDD--TQD---- 696 (970) T ss_pred HHHHHHCCCCCCHHCCHHHHHHHHHHCCCCCCCCCCCCHHHHHH--HHH---HHHHHHHHHHHHHHHCCCC--CCC---- T ss_conf 76432103232002060389999983586789864211898876--767---7678899999999600356--676---- Q ss_pred CCCCCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHCCCHHHHHHHHHHH-HHHHHHHHHCCCCCCCCC-CCCCC-HHH Q ss_conf 234223552114998999999998421899999998528127999999999-988999870686666654-35787-899 Q gi|254780285|r 479 LFPRNVIPQESEFDTSELQLIVHLAEYPRVIENATIAQEPYKLAFYLYDLA-SVFHGHWSHGRENPRLRF-VQANN-RKL 555 (586) Q Consensus 479 ~~~~~~~~~~~~~~~~E~~L~~~l~~f~~vi~~a~~~~~P~~l~~Yl~~La-~~Fn~fY~~~~~~~~~~v-~~~~~-~~~ 555 (586) T Consensus 697 --~~~~~~~~~~~~l~drWILs~L~~~i~~v~~~ld~Y~F~~a~~~ly~F~W~dFCD~YIE~-----~K~~~~~~~~~~~ 769 (970) T TIGR00422 697 --ELELSGGEEKLSLADRWILSKLNRTIKEVREALDKYRFNEAAKALYEFIWNDFCDWYIEL-----VKYRLYNGNDEAE 769 (970) T ss_pred --CCCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHCCCHHHHHHHHHHHHHHHHHHHHHHH-----HCCCCCCCCHHHH T ss_conf --113577632013546999999999999999988403677887576521013451235442-----1431478973899 Q ss_pred HHHHHHHHHHHHHHHHHHHHHCCCCCC Q ss_conf 999999999999999998731587985 Q gi|254780285|r 556 TMMRLQLVHAVASIINSGLNIIGVESP 582 (586) Q Consensus 556 ~~~RL~L~~a~~~vL~~~L~LLGI~~p 582 (586) T Consensus 770 ---k~~A~~~L~~vLd~~l~LLhPf~P 793 (970) T TIGR00422 770 ---KKAARDTLAYVLDKALRLLHPFMP 793 (970) T ss_pred ---HHHHHHHHHHHHHHHHHHHCCCCC T ss_conf ---999999999999999998524552

HHsearch alignment for GI: 254780285 and conserved domain: TIGR00422