>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=100.00 E-value=0 Score=503.05 Aligned_cols=482 Identities=27% Similarity=0.393 Sum_probs=354.8 Q ss_pred CCCCCCCCHHHHH-HHHHHHHHHHHHHCCCCCCCCCCCCCCCCCHHHHHHHHHHHHCCCCHHHCC-HHHHHHHHHHHHHH Q ss_conf 2558897621577-856687899876708982678888244420899999998765599833489-99999999999999 Q gi|254780445|r 63 PYANGHIHIGHAL-NKILKDVIVRSFQMRNFNACFVPGWDCHGLPIEWKVENEYLAKGKKKDDIP-VNEFRQACRDSASA 140 (963) Q Consensus 63 Py~nG~lH~GH~~-n~~~kDi~~Ry~rm~G~~Vl~~~GwD~hGLPiE~~vek~l~~~~~~~~~~~-~~~~~~~c~~~a~~ 140 (963) T Consensus 8 ~Y~Ng~pHlGH~~st~~~AD~~~RY~~~~G~~v~f~cGTDEHG~kI~~~A~~~---------g~tqP~~-------~vd~ 71 (573) T TIGR00398 8 PYANGKPHLGHAYSTTILADVYARYKRLRGYEVLFVCGTDEHGTKIELKAEQE---------GLTQPKE-------LVDK 71 (573) T ss_pred CCCCCCHHHHHHHHHHHHHHHHHHHHHCCCCEEEEEECCCCCCCHHHHHHHHC---------CCCCHHH-------HHHH T ss_conf 66787112103667778999999998528974789851344687888869870---------8996489-------9999 Q ss_pred HHHHHHHHHHHCCEEEECCCCEECCCHHHHHHHHHHHHHHHHCCCEECCCCEEEECCCCCCCCCCHHHE--EEEEECCEE Q ss_conf 999999999970607763698115776798999999999998796110343022057435736500210--132105779 Q gi|254780445|r 141 WVKIQSKEFQRLGIVGDFENPYTTMTRESEAQIASELLKIAESDQIYRGIKPIMWSIAEQTTLAEAEIE--YHDVDSDSI 218 (963) Q Consensus 141 ~i~~~~~~~~rlG~~~Dw~~~y~T~dp~y~~~~~~~F~~l~~kGliyr~~~pV~w~p~~~T~La~~Eve--y~d~~~~s~ 218 (963) T Consensus 72 ~~~~f~~~~~~lnI~fD--~F~RTTd~~H~~~v~~~f~~L~~nGyIY~~~~~g~YC~~c~~Fl~dr~~~~~yv~g~CP-- 147 (573) T TIGR00398 72 YHEEFKKLWKWLNISFD--RFIRTTDEEHKEIVQKIFQKLLENGYIYEKEIKGLYCPECESFLPDRKLVDDYVEGTCP-- 147 (573) T ss_pred HHHHHHHHHHHHCCCCC--CCCCCCCHHHHHHHHHHHHHHHHCCCCCHHCCCCCCCCCCCCCCCHHHHHCCCCCCCCC-- T ss_conf 99999999987284567--65467688889999999999875377411003532347566536223200133467488-- Q ss_pred EEEEEECCCCCCCCCCCCCHHCCHHHHHHHHHHHHCCCCCCEEEEEECCCCCCCCCCCCCEEEECCCHHHHHHHHCCCCE Q ss_conf 99833037531122001100000057886544532277674589983066531111237435512111888887609851 Q gi|254780445|r 219 LVGFPVKSSADYLIKSQIVIWTTTPWTIPGNRAIAFSSNHQYGLYDVISCSGQHTFDTGKKLIISKNLAQSIANQTNVKI 298 (963) Q Consensus 219 ~v~F~l~~~~~~~~~~~~~iwTTrP~Tl~~n~ai~v~p~~~Y~~~~~~~~~~~~~~~~~~~~i~a~~~~~~~~~~~~~~~ 298 (963) T Consensus 148 -------------------------------------------------------------------------------- 147 (573) T TIGR00398 148 -------------------------------------------------------------------------------- 147 (573) T ss_pred -------------------------------------------------------------------------------- T ss_conf -------------------------------------------------------------------------------- Q ss_pred EEEEECCCCCCCCCEEEECCCCCCCCEEEECCCCCCCCCCCCCCEEEEECCCCHHHHHHHHHCCCHHHHHCCCEEEEECC Q ss_conf 78410011111285754313786651255114432233224454056405789889899876052122100220343023 Q gi|254780445|r 299 ALVCDVKAEDLSKTMCSHPLKKLGYTFSVPLIDAEYVANDCGTGFVHVAPSHGVEDFTAWNEAKDILLNRSVDIKVPSPV 378 (963) Q Consensus 299 ~~~~~~~g~~l~g~~~~~Pl~~~~~~~~~pi~~~d~V~~~~GTG~Vh~aPahg~~Dy~~~~~~~~~~~~~~~~l~~~~~v 378 (963) T Consensus 148 --------------------------------------------------~c~~~~~----------------------~ 155 (573) T TIGR00398 148 --------------------------------------------------KCGSEDA----------------------R 155 (573) T ss_pred --------------------------------------------------CCCCCCC----------------------C T ss_conf --------------------------------------------------6887777----------------------7 Q ss_pred CCCCCCCCCCCCCCCCCCCCCCCCCCCCCHHHHHHHHHCCCCCCHHHHCCCCCCCCCCCCCEEEEEEEEEEEEECCCCCC Q ss_conf 44551024310017863211355444567545235664798210000001221132101320333310236630224554 Q gi|254780445|r 379 DGRGFYTTEAPGFSGARVLDDAGEKGNANEVVIAALINACAILNRSIVKHSYPHSWRSKKPIIFRTTSQWFLHMDKKLGD 458 (963) Q Consensus 379 d~~G~~~~~~~~~~G~~v~~~~~~~~~a~~~ii~~L~e~g~l~~~~~~~H~yP~cwR~~~pii~r~~~QWFi~~d~~~~~ 458 (963) T Consensus 156 gd~-------c~~Cg~~-leP------------~~Li--------------~P~c~~~~~~~~~~~~~hyFf~L------ 195 (573) T TIGR00398 156 GDH-------CEVCGRH-LEP------------FELI--------------NPRCVICKNKPELRDSEHYFFRL------ 195 (573) T ss_pred CCC-------CCCCCCC-CCC------------CHHC--------------CCCEEEECCEEEEECCCCCCCCC------ T ss_conf 877-------5546553-685------------0011--------------87025548800251354522353------ Q ss_pred CHHHHHHHHHHHHC-CCC--CCCCCCCCH-HHHHHC-CCCCCCCCCCC---CCCCEEEEECCCCCEEECCCHHHHHHHHH Q ss_conf 23689999875200-000--244434320-244304-32000011234---56722589825884732521124442122 Q gi|254780445|r 459 GSTLRSRALSEVEK-IRF--FPSSGKNRL-RSMIEN-RPDWLLSRQRN---WGVPICFFYNEKGEILLDKAINDRIIKTF 530 (963) Q Consensus 459 ~~~~k~~~l~~i~~-v~~--~P~~~k~r~-~~~i~~-~~DW~ISRqR~---WG~PIPi~~~e~~~~~~~~~~~~~i~~~~ 530 (963) T Consensus 196 -~~~~~~l~~~~~~~~~~~~~~~~~~n~~~~~~~~~GL~D~~ItR~~~~lkWG~pvP~----~~---------------- 254 (573) T TIGR00398 196 -SAFEKELEEWIKKNPESKSPASNVKNVAKQNWIKGGLKDLAITRDLVDLKWGIPVPN----DG---------------- 254 (573) T ss_pred -HHHHHHHHHHHHCCCCCCCHHHHHHHHHHHHHHCCCCCCCEEECCCCCCCCCCCCCC----CC---------------- T ss_conf -688899999861488424218999999889985068743011036441211531789----89---------------- Q ss_pred HHCCCCCCCCCCCHHCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC-------CCC--CCCCCCCCCC------CCCCCCC Q ss_conf 211887433564011146887887554566421000033354543-------322--2223334431------0025544 Q gi|254780445|r 531 KDQGSDAWFSEGSRDFFLGDRASEPWIQSKDILDVWFDSACTHTI-------LLG--KDPKLAWPAD------VYLEGSD 595 (963) Q Consensus 531 ~~~g~d~~~~~~~~~~~~~~~~~~~~~r~~DvlDvWfDSg~s~~~-------~~~--~~~~~~~PaD------~~~eG~D 595 (963) T Consensus 255 ---------------------------~p~~~~YVW~DAl~gYiss~~~~~~~~~~~~~~~~~W~~~~~~~~~~HfIGKD 307 (573) T TIGR00398 255 ---------------------------APNKVVYVWFDALIGYISSLKALGIEKGLTEDWKKWWNNNSEDAELIHFIGKD 307 (573) T ss_pred ---------------------------CCCCEEEEEECHHHHHHHHHHHCCCCCCCCHHHHHHCCCCCCCCEEEEEECCC T ss_conf ---------------------------87967998720345699997521335687578998626888650278884241 Q ss_pred CCCHHHHHHHHHHHHCC-C---CCEEEEECCCCCEECCCCCCHHCCCCCCCCHHH-HHCC-CCHHHHHHHHH-HCCCCCC Q ss_conf 42111245544433117-8---400001303782621345300001234433366-4113-67578878887-1787665 Q gi|254780445|r 596 QHRGWFQHSLLESCATR-G---STPFTSLITHGFSVDENGEKMSKSKGNVVFPEE-IISE-SGADVLRYWAV-NSDYHDD 668 (963) Q Consensus 596 q~RgWF~s~ll~~~~~~-~---~~Pfk~v~~hG~vld~~G~KMSKS~GNvi~p~~-ii~~-yGaD~lR~~~~-~~~~~~d 668 (963) T Consensus 308 I~~--FH~iyWPa~L~~~~eN~~lP-~q~~~hGyl~~e-G~KMSKS~G~vv~~~~~~~~~~~g~D~lRYYl~~~~~~~~D 383 (573) T TIGR00398 308 IVR--FHTIYWPAMLMGLGENLPLP-TQVFAHGYLTVE-GQKMSKSLGNVVDPEDDLLARGYGADILRYYLLKEVPLGKD 383 (573) T ss_pred CCC--HHHHHHHHHHHHCCCHHHHH-HHHEEEEEEEEC-CEEECCCCCCEECHHHHHHHCCCCHHHHHHHHHHHCCCCCC T ss_conf 202--03334458885112100212-132430168847-84432324753232178764478805788899864243447 Q ss_pred CCCCCHHHHHHH--HHHHHHCCCCCCCCCCCC-CCCCCCCCH--------------HHHHHHHHHHHHHHHHHHHHHHHH Q ss_conf 544310256777--640000011000001224-444567310--------------111278887543689999998898 Q gi|254780445|r 669 QRLGKNIIQTNI--DTYRKLRNTIRWMLGMLA-HDTGNEPSL--------------ADMPALEQLMLHRLTELDQVVREA 731 (963) Q Consensus 669 ~~~~~~~l~~~~--~~~~kl~Nt~rf~l~~l~-~~~~~~~~~--------------~~l~~~DkwiLskl~~~i~~v~~~ 731 (963) T Consensus 384 ~~F~~~~f~~r~N~~L~n~lGNl~nR~~~f~~k~f~g~~~~~~~~nfqfqeifqneP~l~~~~~~l~~~~~~~~~~~~~~ 463 (573) T TIGR00398 384 GDFSWEDFVERVNADLANDLGNLLNRTLGFIKKYFNGVLPSVDETNFQFQEIFQNEPKLTEEDKELLKKINETLEQIDKA 463 (573) T ss_pred CCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCHHHHHHHHHHHHHCCCCCCHHHHHHHHHHHHHHHHHHHH T ss_conf 65688999999768877655589999999998873562110101234566665037652235668999999999999998 Q ss_pred HHHHHHHHHHHHHHHHHHHHCCCCHHHCCCHHHCCCCCCCHHHHHHHHHHHH---HHHHHHHHHCCHHHHHHHHHHHHCC Q ss_conf 7654012266889987863024001010201222789980899999999999---9999999970004489999998638 Q gi|254780445|r 732 YDAFNFKEVVRQLTNFSNAELSSFYFDIRKDSLYCDSPSSLKRLSSIAVIRI---LCRHLIIWIAPILPFTAEEAWLSLN 808 (963) Q Consensus 732 ~e~~~f~~a~~~i~~F~~~dLS~~Yld~~Kdrly~~~~~s~~R~s~~~~L~~---il~~l~~lLaPi~P~~aEEiw~~l~ 808 (963) T Consensus 464 ~~~~~f~~Al~~~~~L~~--~gNkyi~~~~P--W~l~k~~~~~~~l~~~~~~~~e~~~~l~~Ll~P~~P~~~~k~~~~~n 539 (573) T TIGR00398 464 LESFEFRKALEEILKLAD--RGNKYIDDNEP--WELAKQSEKLKELLAVCSLVAELIRVLSILLYPFMPKLSEKILKLLN 539 (573) T ss_pred HHHHHHHHHHHHHHHHHH--HHHHHHHHCCC--CEEECCCHHHHHHHHHHHHHHHHHHHHHHHHCCCHHHHHHHHHHHHC T ss_conf 862038999999999999--86147652388--71325706799999999999999999999842410247899999838 Q ss_pred CCCC Q ss_conf 8677 Q gi|254780445|r 809 PEAV 812 (963) Q Consensus 809 ~~~~ 812 (963) T Consensus 540 ~~~~ 543 (573) T TIGR00398 540 FELE 543 (573) T ss_pred CCHH T ss_conf 8701

HHsearch alignment for GI: 254780445 and conserved domain: TIGR00398