>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=559.52 Aligned_cols=494 Identities=25% Similarity=0.400 Sum_probs=384.2 Q ss_pred EEECCCCCCCCCCCHHHHH-HHHHHHHHHHHHHCCCCCCCCCCCCCCCCHHHHHHHHHHHHHHCCCC-HHHCCHHHHHHH Q ss_conf 9972844999986543788-96779999987670898356778815454089999999976745998-777798999999 Q gi|254780933|r 40 CIAMPPPNVTGSLHMGHAF-NTTIQDIMIRFERMRGKNVLWQPGTDHAGIATQITVESRLFAQSSLT-REDIGRDAFIEK 117 (947) Q Consensus 40 ~~~~ppP~~nG~lHiGH~~-~~t~~Di~~Ry~rm~G~~Vl~~~G~D~~GlPiE~~vek~l~~~~~~~-~~~~g~~~f~~~ 117 (947) T Consensus 2 liTtpl~Y~Ng~pHlGH~~st~~~AD~~~RY~~~~G~~v~f~cGTDEHG~kI~~~A~~~-----g~tqP~---------- 66 (573) T TIGR00398 2 LITTPLPYANGKPHLGHAYSTTILADVYARYKRLRGYEVLFVCGTDEHGTKIELKAEQE-----GLTQPK---------- 66 (573) T ss_pred CCCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHCCCCEEEEEECCCCCCCHHHHHHHHC-----CCCCHH---------- T ss_conf 10057766787112103667778999999998528974789851344687888869870-----899648---------- Q ss_pred HHHHHHHHHHHHHHHHHHHCCEEECCCCEECCCHHHHHHHHHHHHHHHHCCCEEECCCEEEECCCCCCCCCHHHHHCCCC Q ss_conf 99999999999999999808366427981158867999999999999988943313320220377678014868654146 Q gi|254780933|r 118 VWEWKKESGGSILSQLKRLGASCDWSRERFTMDEGMSNAVRNAFVVLYKDGLIYRDKRIVNWDPSLKTSVSDLEVIQKEV 197 (947) Q Consensus 118 ~~~~~~~~~~~~~~~~~~lG~~~Dw~r~y~T~d~~y~~~v~~~F~~L~~~gliy~~~~~v~w~p~~~T~ls~~Ev~~~~~ 197 (947) T Consensus 67 --~~vd~~~~~f~~~~~~lnI~fD--~F~RTTd~~H~~~v~~~f~~L~~nGyIY~~~~~g~YC~~c~~Fl~dr~~~~~yv 142 (573) T TIGR00398 67 --ELVDKYHEEFKKLWKWLNISFD--RFIRTTDEEHKEIVQKIFQKLLENGYIYEKEIKGLYCPECESFLPDRKLVDDYV 142 (573) T ss_pred --HHHHHHHHHHHHHHHHHCCCCC--CCCCCCCHHHHHHHHHHHHHHHHCCCCCHHCCCCCCCCCCCCCCCHHHHHCCCC T ss_conf --9999999999999987284567--654676888899999999998753774110035323475665362232001334 Q ss_pred CCCEEEEEEEEECCCCCCCCCCCCCCCCCCCCCCCCEEEEEECCCCHHCHHHHHHHHHCCHHHHHHCCCEEEECCCCCCC Q ss_conf 87669999653045300012455555442456887169998267401010244444410001231115423320248657 Q gi|254780933|r 198 DGNLWYVRYPLVEGVTYRHPIKFDDDAKPIDWEVRDYIIVSTTRPETMFGDVAIAVHPDDYRYKELIGKYATLPIVGRLI 277 (947) Q Consensus 198 ~~~~~~ik~~l~~~~~~~~~~~~~~~~~~~~~~~~~~l~v~TtrPeTl~g~~a~~v~P~d~~y~~l~G~~~~~Pl~~~~i 277 (947) T Consensus 143 ~g---------------------------------------------------------------------~CP~c~~~~ 153 (573) T TIGR00398 143 EG---------------------------------------------------------------------TCPKCGSED 153 (573) T ss_pred CC---------------------------------------------------------------------CCCCCCCCC T ss_conf 67---------------------------------------------------------------------488688777 Q ss_pred CCCCCCCCCCCCCCCEEEECCCCCHHHHHHHHHCCCCCCCEECCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCHHH Q ss_conf 32100003421223203212477855656643046531110167775213665444555434655465553100151233 Q gi|254780933|r 278 PIVSDVYPDPEFGDGAVKVTPAHDFNDFEIAKRHGLGFINILTPEAKIFLSENESFLENIVLSDEARNIFSEFEGLDCFA 357 (947) Q Consensus 278 pi~~~~~V~~~~GTG~V~~~Pah~~~Dy~~~~~~~l~~~~~~~~~g~~~~~~~~~~~~~~~~~~~~~~~~~~~~G~~v~~ 357 (947) T Consensus 154 ~-------~gd~c------------------------------------------------------------------- 159 (573) T TIGR00398 154 A-------RGDHC------------------------------------------------------------------- 159 (573) T ss_pred C-------CCCCC------------------------------------------------------------------- T ss_conf 7-------78775------------------------------------------------------------------- Q ss_pred HHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCCCCEEEEEEHHHEECCCCCHHHHHHHHHCCCCCEEC-CCCCHHH-HHHH Q ss_conf 4488899888876433321022322235666553244431222121454202333432002441121-4431135-6764 Q gi|254780933|r 358 ARSKIVSLLEKSNLLDKTDSYRHIVPHCERSGVTIEPCITEQWYLDAKVLAESAIRSAKNGCLSFIP-QSWDKSY-YEWL 435 (947) Q Consensus 358 a~~~ii~~L~~~g~l~~~~~~~h~~p~c~R~~~~i~~~~~~QWfi~~~~~~~~~l~~~~~~~i~~~P-~~~~~~~-~~wl 435 (947) T Consensus 160 ---------~~Cg~--~leP~~Li~P~c~~~~~~~~~~~~~hyFf~L~~~~~~l~~~~~~~~~~~~~~~~~~n~~~~~~~ 228 (573) T TIGR00398 160 ---------EVCGR--HLEPFELINPRCVICKNKPELRDSEHYFFRLSAFEKELEEWIKKNPESKSPASNVKNVAKQNWI 228 (573) T ss_pred ---------CCCCC--CCCCCHHCCCCEEEECCEEEEECCCCCCCCCHHHHHHHHHHHHCCCCCCCHHHHHHHHHHHHHH T ss_conf ---------54655--3685001187025548800251354522353688899999861488424218999999889985 Q ss_pred HC-CCCCCCCCCCC---CCCCEEEEECCCCCEEECCCCHHHHHHCCCCCCCCCCCCCCCCCCCCCCCCCCCCEEECCCEE Q ss_conf 10-11123212354---563102698389988765762344542034556787765554100256888831018824100 Q gi|254780933|r 436 EN-IQPWCISRQIW---WGHQIPVWYSPDGKLFVENTEDAALRSAIDYYLSQDNDMTVKVRKMIKDGNISDLLKRDEDVL 511 (947) Q Consensus 436 ~~-~~DW~ISRqr~---WG~pIPvw~~~~~~~~v~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~r~~Dvl 511 (947) T Consensus 229 ~~GL~D~~ItR~~~~lkWG~pvP~----~~--------------------------------------------~p~~~~ 260 (573) T TIGR00398 229 KGGLKDLAITRDLVDLKWGIPVPN----DG--------------------------------------------APNKVV 260 (573) T ss_pred CCCCCCCEEECCCCCCCCCCCCCC----CC--------------------------------------------CCCCEE T ss_conf 068743011036441211531789----89--------------------------------------------879679 Q ss_pred CCEEECCCCCCC---EECHHH-HHHCCCCCCCCC------CCCCCCCCCCC----HHHHHHHHH--HHCCCCCCCCCCCC Q ss_conf 220204423332---010111-100012345553------01245543210----135677766--53012113378685 Q gi|254780933|r 512 DTWFSSALWPFA---SLGWPE-QTAELKTYYPTS------VLVTGFDILFF----WVARMMMMG--LYFMKDAEGKGIEP 575 (947) Q Consensus 512 DtWfdSg~~p~~---~l~~p~-~~~e~~~~~P~d------~~~~G~Di~r~----W~~~~l~~~--~~l~~~~~~~~~~P 575 (947) T Consensus 261 YVW~DAl~gYiss~~~~~~~~~~~~~~~~~W~~~~~~~~~~HfIGKDI~~FH~iyWPa~L~~~~eN~~l----------P 330 (573) T TIGR00398 261 YVWFDALIGYISSLKALGIEKGLTEDWKKWWNNNSEDAELIHFIGKDIVRFHTIYWPAMLMGLGENLPL----------P 330 (573) T ss_pred EEEECHHHHHHHHHHHCCCCCCCCHHHHHHCCCCCCCCEEEEEECCCCCCHHHHHHHHHHHHCCCHHHH----------H T ss_conf 987203456999975213356875789986268886502788842412020333445888511210021----------2 Q ss_pred CCHHCCCCCCCCHHHHHHHHHCCCCCCHHH-HHCC-CCHHHHHHHHHCCCCCCCCCCCCCCCCCCC--HHHHHHHHH-HH Q ss_conf 200001443100012255431245653023-3202-540344454312335567754341101110--000123444-33 Q gi|254780933|r 576 FHIVYMHALVRDKNGQKMSKSKGNVVDPID-VIDQ-YGADALRFYFSIMAVQGRDINLDLERIAGY--RNFITKFWN-AI 650 (947) Q Consensus 576 fk~v~~hG~vld~~G~KMSKS~GNvidp~e-~i~~-yGaDalR~~l~~~~~~~~D~~fs~~~i~~~--r~f~nKLwN-a~ 650 (947) T Consensus 331 -~q~~~hGyl~~-eG~KMSKS~G~vv~~~~~~~~~~~g~D~lRYYl~~~~~~~~D~~F~~~~f~~r~N~~L~n~lGNl~n 408 (573) T TIGR00398 331 -TQVFAHGYLTV-EGQKMSKSLGNVVDPEDDLLARGYGADILRYYLLKEVPLGKDGDFSWEDFVERVNADLANDLGNLLN 408 (573) T ss_pred -HHHEEEEEEEE-CCEEECCCCCCEECHHHHHHHCCCCHHHHHHHHHHHCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHH T ss_conf -13243016884-7844323247532321787644788057888998642434476568899999976887765558999 Q ss_pred HHHHCCCCCCCCCCCC--------------CCCCCHHHHHHHHHHHHHHHHHHHHHHHHCCCHHHHHHHHHHHCCHHHHH Q ss_conf 3320244457767677--------------43331555677999999998889987531001024577765310013688 Q gi|254780933|r 651 RFSKMKNARHSVSFVP--------------QDVKWIVNKWIIKRLATVINDVTVGMENHRFNDVSAVLYRFVWDELCDWY 716 (947) Q Consensus 651 rf~~~~~~~~~~~~~~--------------~~~~~~~Drwils~l~~~i~~v~~~~e~~~f~~a~~~i~~F~~~~~~~~Y 716 (947) T Consensus 409 R~~~f~~k~f~g~~~~~~~~nfqfqeifqneP~l~~~~~~l~~~~~~~~~~~~~~~~~~~f~~Al~~~~~L~--~~gNky 486 (573) T TIGR00398 409 RTLGFIKKYFNGVLPSVDETNFQFQEIFQNEPKLTEEDKELLKKINETLEQIDKALESFEFRKALEEILKLA--DRGNKY 486 (573) T ss_pred HHHHHHHHHHCCCCCCHHHHHHHHHHHHHCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH--HHHHHH T ss_conf 999999887356211010123456666503765223566899999999999999886203899999999999--986147 Q ss_pred HHHHHHHHHCCCHHHHHHHHHHHHH---HHHHHCCCCCCCHHHHHHHHHHHCCCC Q ss_conf 9864765305671444321000145---676403456774489999999743566 Q gi|254780933|r 717 VEFIKSILNQKDSELVSETLSCFSY---VLYNVCKLLHPIIPFVTEDLYSHVSPQ 768 (947) Q Consensus 717 ie~~K~~l~~~~~~~~~~~~~~l~~---vl~~~l~ll~P~~PfitEeiw~~l~~~ 768 (947) T Consensus 487 i~~~~PW~l~k~~~~~~~l~~~~~~~~e~~~~l~~Ll~P~~P~~~~k~~~~~n~~ 541 (573) T TIGR00398 487 IDDNEPWELAKQSEKLKELLAVCSLVAELIRVLSILLYPFMPKLSEKILKLLNFE 541 (573) T ss_pred HHHCCCCEEECCCHHHHHHHHHHHHHHHHHHHHHHHHCCCHHHHHHHHHHHHCCC T ss_conf 6523887132570679999999999999999999984241024789999983887

HHsearch alignment for GI: 254780933 and conserved domain: TIGR00398