>TIGR00398 metG methionyl-tRNA synthetase; InterPro: IPR002304 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 . Methionyl-tRNA synthetase (6.1.1.10 from EC) is an alpha 2 dimer that belongs to class Ia. In some species (archaea, eubacteria and eukaryota) a coding sequence, similar to the C-term end of MetRS, is present as an independent gene which is a tRNA binding domain as a dimer. In eubacteria, MetRS can also be splitted in two sub-classes corresponding to the presence of one or two CXXC domain specific to zinc binding. The crystal structures of a number of methionyl-tRNA synthases are known , , .; GO: 0000166 nucleotide binding, 0004825 methionine-tRNA ligase activity, 0005524 ATP binding, 0006412 translation, 0006431 methionyl-tRNA aminoacylation, 0005737 cytoplasm.

Probab=99.89 E-value=3.9e-21 Score=171.39 Aligned_cols=325 Identities=24% Similarity=0.231 Sum_probs=204.7 Q ss_pred CCCCCCCCCCH-HHHHHHHHHHHHHHHCCCCCEEEEECCCCC-CHHHHHHHHHCCCCCCCCCC-HHHHHHHHHHHHHHHH Q ss_conf 88844411127-999999999999970799845799605523-38889999870898644884-8999999999999987 Q gi|254780573|r 35 VYDFAHIGNAR-PMIVFDVLYRLLRYYYGEKCVTYVRNITDI-DDKIIERARQEHPSIPINDA-ISIITSKNTQQFVKDT 111 (461) Q Consensus 35 vy~~~HiG~~r-~~v~~D~l~R~L~~~~~~~~V~~v~niTDi-dDkii~~a~~~~~~~~~~~~-~~~~a~~~~~~f~~d~ 111 (461) T Consensus 10 ~Ng~pHlGH~~st~~~AD~~~RY~~~~G~~--v~f~cG-TDEHG~kI~~~A~~~g------~tqP~~~vd~~~~~f~~~~ 80 (573) T TIGR00398 10 ANGKPHLGHAYSTTILADVYARYKRLRGYE--VLFVCG-TDEHGTKIELKAEQEG------LTQPKELVDKYHEEFKKLW 80 (573) T ss_pred CCCCHHHHHHHHHHHHHHHHHHHHHCCCCE--EEEEEC-CCCCCCHHHHHHHHCC------CCCHHHHHHHHHHHHHHHH T ss_conf 787112103667778999999998528974--789851-3446878888698708------9964899999999999999 Q ss_pred HHHCCCCCCHHHHHHH--HHHHHHHHHHHHHHCCCCCCCCCCEEECCHHCC---C------C--------CCCCC----- Q ss_conf 7626854100012356--777789999987411432012892875220024---5------4--------32246----- Q gi|254780573|r 112 TRLACLAPTHQPRATN--HIPQMIYLIQNIILHGHAYEANNEIIFDTSSIP---N------Y--------GSFSR----- 167 (461) Q Consensus 112 ~~L~v~~p~~~pr~t~--~i~~~i~~i~~L~~~g~aY~~~g~VyFdv~~~~---~------Y--------G~Ls~----- 167 (461) T Consensus 81 ~~lnI~f-D~F~RTTd~~H~~~v~~~f~~L~~nGyIY~~~~~g~YC~~c~~Fl~dr~~~~~yv~g~CP~c~~~~~~gd~c 159 (573) T TIGR00398 81 KWLNISF-DRFIRTTDEEHKEIVQKIFQKLLENGYIYEKEIKGLYCPECESFLPDRKLVDDYVEGTCPKCGSEDARGDHC 159 (573) T ss_pred HHHCCCC-CCCCCCCCHHHHHHHHHHHHHHHHCCCCCHHCCCCCCCCCCCCCCCHHHHHCCCCCCCCCCCCCCCCCCCCC T ss_conf 8728456-765467688889999999999875377411003532347566536223200133467488688777778775 Q ss_pred ------CCHHHHHH------HHHCCCCCCC-----------------CCCCCEEEEEC----------CCCCC----CEE Q ss_conf ------75466664------3210222210-----------------12351266633----------77666----314 Q gi|254780573|r 168 ------RKIDEQKM------GTRVPEKYHK-----------------KNPADFILWKR----------STPME----PGW 204 (461) Q Consensus 168 ------~~~~~~~~------g~r~~~~~~K-----------------~~p~DFaLWK~----------~~~~e----~~w 204 (461) T Consensus 160 ~~Cg~~leP~~Li~P~c~~~~~~~~~~~~~hyFf~L~~~~~~l~~~~~~~~~~~~~~~~~~n~~~~~~~~~GL~D~~ItR 239 (573) T TIGR00398 160 EVCGRHLEPFELINPRCVICKNKPELRDSEHYFFRLSAFEKELEEWIKKNPESKSPASNVKNVAKQNWIKGGLKDLAITR 239 (573) T ss_pred CCCCCCCCCCHHCCCCEEEECCEEEEECCCCCCCCCHHHHHHHHHHHHCCCCCCCHHHHHHHHHHHHHHCCCCCCCEEEC T ss_conf 54655368500118702554880025135452235368889999986148842421899999988998506874301103 Q ss_pred ECC---CCCCC-----CC-----CC-CHHHHHH-HHHCCC------------CEE------EEEECCCCCCCCCHH-HHH Q ss_conf 146---77667-----64-----33-2047777-875298------------414------874135666687513-668 Q gi|254780573|r 205 ESP---WGRGR-----PG-----WH-IECSAMS-SHYLGK------------VFD------IHGGGLDLIFPHHEN-EIA 250 (461) Q Consensus 205 ~sp---wG~GR-----PG-----WH-iECsam~-~~~lg~------------~~D------IH~GG~DL~FPHHEN-EiA 250 (461) T Consensus 240 ~~~~lkWG~pvP~~~~p~~~~YVW~DAl~gYiss~~~~~~~~~~~~~~~~~W~~~~~~~~~~HfIGKDI~~-FH~iyWPa 318 (573) T TIGR00398 240 DLVDLKWGIPVPNDGAPNKVVYVWFDALIGYISSLKALGIEKGLTEDWKKWWNNNSEDAELIHFIGKDIVR-FHTIYWPA 318 (573) T ss_pred CCCCCCCCCCCCCCCCCCCEEEEEECHHHHHHHHHHHCCCCCCCCHHHHHHCCCCCCCCEEEEEECCCCCC-HHHHHHHH T ss_conf 64412115317898987967998720345699997521335687578998626888650278884241202-03334458 Q ss_pred HHHHHCC--CCCCHHHEECCCEEEEEECCCCCCCCCCCCHHH-HHCCCCCCCCCCCHHHHHHHHH-CCCCCCCCCCCHHH Q ss_conf 8886408--753012100343257642022332332140899-8502533455777999999984-25664321145034 Q gi|254780573|r 251 QSCCADR--IEKTANIWIHNGFLNLEGRKMSKSNGNFITINE-LLETKKFGGRSWPAPVIRLAML-MTHYREPIDFTVQR 326 (461) Q Consensus 251 Qs~a~~~--~~~~a~yWlH~G~l~i~geKMSKSlGN~iti~d-lL~~~~~~~k~y~p~viR~~lL-sshYRspLdfS~e~ 326 (461) T Consensus 319 ~L~-~~~eN~~lP~q~~~h-Gyl~~eG~KMSKS~G~vv~~~~~~~~------~~~g~D~lRYYl~~~~~~~~D~~F~~~~ 390 (573) T TIGR00398 319 MLM-GLGENLPLPTQVFAH-GYLTVEGQKMSKSLGNVVDPEDDLLA------RGYGADILRYYLLKEVPLGKDGDFSWED 390 (573) T ss_pred HHH-HCCCHHHHHHHHEEE-EEEEECCEEECCCCCCEECHHHHHHH------CCCCHHHHHHHHHHHCCCCCCCCCCHHH T ss_conf 885-112100212132430-16884784432324753232178764------4788057888998642434476568899 Q ss_pred HHHHH---------HHHHHCCCCC--------CCCC-----------------CCCHHH----------HHHCCCHHHHH Q ss_conf 68777---------6432100001--------3510-----------------059677----------63021101279 Q gi|254780573|r 327 LTEAE---------ILLSKWPQTS--------TSKG-----------------IIDPAV----------LSALYNDLNTV 362 (461) Q Consensus 327 L~~A~---------~~l~kl~~~~--------~~~~-----------------~~~~~f----------~~AL~DDLNTp 362 (461) T Consensus 391 f~~r~N~~L~n~lGNl~nR~~~f~~k~f~g~~~~~~~~nfqfqeifqneP~l~~~~~~l~~~~~~~~~~~~~~~~~~~f~ 470 (573) T TIGR00398 391 FVERVNADLANDLGNLLNRTLGFIKKYFNGVLPSVDETNFQFQEIFQNEPKLTEEDKELLKKINETLEQIDKALESFEFR 470 (573) T ss_pred HHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCHHHHHHHHHHHHHCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHH T ss_conf 99997688776555899999999988735621101012345666650376522356689999999999999988620389 Q ss_pred HHHHHHHHHHHHHCCC Q ss_conf 9999999999975130 Q gi|254780573|r 363 SAIQALHKLARESTKN 378 (461) Q Consensus 363 ~ALa~L~~lvk~~n~~ 378 (461) T Consensus 471 ~Al~~~~~L~~~gNky 486 (573) T TIGR00398 471 KALEEILKLADRGNKY 486 (573) T ss_pred HHHHHHHHHHHHHHHH T ss_conf 9999999999986147

HHsearch alignment for GI: 254780573 and conserved domain: TIGR00398