>TIGR00435 cysS cysteinyl-tRNA synthetase; InterPro: IPR002308 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 . Cysteinyl-tRNA synthetase (6.1.1.16 from EC) is an alpha monomer and belongs to class Ia.; GO: 0000166 nucleotide binding, 0004817 cysteine-tRNA ligase activity, 0005524 ATP binding, 0006412 translation, 0006423 cysteinyl-tRNA aminoacylation, 0005737 cytoplasm.

Probab=97.04 E-value=0.0038 Score=41.65 Aligned_cols=198 Identities=18% Similarity=0.212 Sum_probs=112.0 Q ss_pred CCHHHHHHHHH-----HHHHCCCCC-CCCCCCCCCCCCEECCCCHHHHHHHHHHHHHCCCEEECCCCHHHHHHHHHHHHH Q ss_conf 88679999999-----988658988-867655887676323262899999999999889824514889997766887664 Q gi|255764513|r 53 STLESENAVMQ-----SLKWCGLNW-DEGPDIGGAYGPYRQSERKNIYQPYVQNLLEKKLAFRCFCSTERLEEMRRAQRK 126 (492) Q Consensus 53 ~~~~~~~~i~~-----~l~wlgl~~-De~~~~~g~~~p~~QS~r~~~y~~~~~~L~~~g~aY~c~~t~eel~~~r~~~~~ 126 (492) T Consensus 207 e~~~~i~aY~~qkfndD~~aLNv~~p~~~---------pr~te~id~iie~i~~L~~KgyAY~~~~G--dVY--F~v~~f 273 (660) T TIGR00435 207 ESERFIEAYFEQKFNDDLEALNVLPPDLE---------PRVTEHIDEIIEFIEQLIEKGYAYVSDNG--DVY--FDVSKF 273 (660) T ss_pred HHHHHHHHHHHHHHHHHHHHCCCCCCCCE---------EEECCCCCHHHHHHHHHHHCCCEEEECCC--CEE--EECCCC T ss_conf 16889999986557888874287388401---------66311243147899999868920530688--646--531677 Q ss_pred HHCCCCCCCCCCCCCHHHHHHHHHCCCCCEEEEEECCCCEEECCCCCCCCEECCCCCCCCCCEECCC------------- Q ss_conf 3100023665557883330011202577407886224311430475134021364323564100045------------- Q gi|255764513|r 127 RNIPSRYDGHCLKLSSQEIERLSQEQKKHVVRLTVPNQGSCVFQDKVYGEMEIPWNAVDMQVLLKSD------------- 193 (492) Q Consensus 127 ~~~~~~Y~~~~r~l~~~e~~~~~~~g~~~~iR~k~p~~~~~~~~D~i~G~~~~~~~~~~D~vi~r~d------------- 193 (492) T Consensus 274 ~ksPnh~YG~Ls~Wn~~~~~~-l~~g~~~~v~~~~P~-----------Ga~K---r~~~DFvLWK~~k~g~~~E~~W~SP 338 (660) T TIGR00435 274 KKSPNHDYGKLSGWNKQSLDE-LEAGARVRVDEAKPD-----------GAKK---RNKLDFVLWKSAKEGKDQEPKWDSP 338 (660) T ss_pred CCCCCCCCCCCCCCCCCCHHH-HHCCCCCCCCCCCCC-----------CCCC---CCCCCHHHHHCCCCCCCCCCCCCCC T ss_conf 888888764326755554466-625786455235887-----------5335---6776502220067887777431777 Q ss_pred ---CCHHHHHHHHH-HHHHHHHHHHHCCCCCCCHHHHHHHH-------------------HHHHH-HCCC-HHHHHHHHH Q ss_conf ---32489867887-64444444311223543024788999-------------------99851-0000-010145553 Q gi|255764513|r 194 ---GMPTYHLANVI-DDHLMKITHVARGEEWISSVPKHILL-------------------YQYFN-FPIP-EFIHLPLIK 248 (492) Q Consensus 194 ---g~ptY~~a~vv-DD~~m~ithviRg~d~~~~t~~q~~l-------------------~~al~-~~~p-~f~H~pli~ 248 (492) T Consensus 339 WG~GRPGWHiECS~M~~~~Lg----------ltntP~~~DIH~GG~DL~FPHHENE~Aqs~a~~gn~~~~~yW~H~G~~- 407 (660) T TIGR00435 339 WGKGRPGWHIECSAMVDKYLG----------LTNTPDQIDIHGGGVDLIFPHHENEIAQSEALFGNKQLAKYWLHNGFL- 407 (660) T ss_pred CCCCCCCHHHHHHHHHHHHCC----------CCCCCCCCEECCCCCCCCCCCCHHHHHHHHHHHCCCCEEEEEEECCEE- T ss_conf 888888158999999997513----------567865430134887788878778999999872898568999851778- Q ss_pred HHHCCCCCCCCCC-CCHHHHHHCCCCHHHHHHHHHHCCCCCC Q ss_conf 1101322122343-3024566629773779989985067666 Q gi|255764513|r 249 NPDKSKLSKRRNP-TSISYYSAMGYLPEALINFLALLFVHKS 289 (492) Q Consensus 249 ~~~g~klSKR~~~-~~i~~~~~~GylPeAilNyLalLGws~~ 289 (492) T Consensus 408 ~id~eKMSKSLgNF~~v~D~L~q~~d~~~lR~~~l~~HYr~p 449 (660) T TIGR00435 408 MIDNEKMSKSLGNFITVRDVLKQNYDPEVLRYLLLSVHYRSP 449 (660) T ss_pred EECCCCCCHHHHHHHHHHHHHHCCCCHHHHHHHHHHHHHCCC T ss_conf 976721651555688888687427689999999876553145

HHsearch alignment for GI: 255764513 and conserved domain: TIGR00435