>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=492.09 Aligned_cols=488 Identities=22% Similarity=0.331 Sum_probs=333.0 Q ss_pred EEEEECCCCCCCCCCCCHHH-HHHHHHHHHHHHHHCCCCCCCCCCCCCCCHHHHHHHHHHCCC-HHHHHHHHHHHHHHHH Q ss_conf 89980778978987400477-977899999977718985567688140205899999980999-9999999999999999 Q gi|254780802|r 36 YFVLEMFPYPSGNIHMGHLR-NYVIGDVVARFMRASGYSVLHPMGWDAFGMPAENAAREHNVH-PKMWTYQNIKVMRKQL 113 (869) Q Consensus 36 f~i~~~pPy~nG~lHiGH~~-~~t~~Dv~aRy~rm~G~~Vl~~~G~d~~GlPie~~~~e~~~~-~~~~~~~~i~~~k~~~ 113 (869) T Consensus 1 ~liTtpl~Y~Ng~pHlGH~~st~~~AD~~~RY~~~~G~~v~f~cGTDEHG~kI~~~A~~~g~tqP~~~vd~~~~~f~~~~ 80 (573) T TIGR00398 1 ILITTPLPYANGKPHLGHAYSTTILADVYARYKRLRGYEVLFVCGTDEHGTKIELKAEQEGLTQPKELVDKYHEEFKKLW 80 (573) T ss_pred CCCCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHCCCCEEEEEECCCCCCCHHHHHHHHCCCCCHHHHHHHHHHHHHHHH T ss_conf 91005776678711210366777899999999852897478985134468788886987089964899999999999999 Q ss_pred HHCCCEEECCCCEECCCHHHHHHHHHHHHHHHHCCCEEECCEEEECCCCCCCCCCHHHHH----CCCCCCCCCCCCCCCC Q ss_conf 981917664698214773599999999999998896341221332147767677898984----3853345643223347 Q gi|254780802|r 114 QSIGLSIDWSKDFATCDVDYYHCQQLLFLDFMKHNVIVRKTAQVNWDPVEQTVLANEQVI----NGRGWRSDAPVEQRSL 189 (869) Q Consensus 114 ~~lG~~~DW~r~y~T~d~~y~~~v~w~f~~L~~kGliyrg~~pV~wcp~~~t~la~~Ev~----~g~~~~~~~~v~~~~~ 189 (869) T Consensus 81 ~~lnI~fD--~F~RTTd~~H~~~v~~~f~~L~~nGyIY~~~~~g~YC~~c~~Fl~dr~~~~~yv~g~CP~c~~~~~~gd~ 158 (573) T TIGR00398 81 KWLNISFD--RFIRTTDEEHKEIVQKIFQKLLENGYIYEKEIKGLYCPECESFLPDRKLVDDYVEGTCPKCGSEDARGDH 158 (573) T ss_pred HHHCCCCC--CCCCCCCHHHHHHHHHHHHHHHHCCCCCHHCCCCCCCCCCCCCCCHHHHHCCCCCCCCCCCCCCCCCCCC T ss_conf 87284567--6546768888999999999987537741100353234756653622320013346748868877777877 Q ss_pred CCCCCCHHHHHHHHHHHCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCEEEEEEECCCCCCCCCEEEEECC Q ss_conf 52334303444544321002255432222210001455767545355567777775136532001344432320033024 Q gi|254780802|r 190 PQWFFKISDLSQELLDSIETLSEWPEKVKIMQKNWIGRSEGMEIRWEIVSNTIDQIEEILVYTTRPETIFGASFIAIAVD 269 (869) Q Consensus 190 ~~~~~~~~~~~~~l~~~~~~l~~~p~~v~~~~~~~i~~~~~~~~~~~~~~~~~~~~~~l~~~TtrPeTl~g~~~i~v~~~ 269 (869) T Consensus 159 --------------------------------------------------------c~~Cg~~leP~~------------ 170 (573) T TIGR00398 159 --------------------------------------------------------CEVCGRHLEPFE------------ 170 (573) T ss_pred --------------------------------------------------------CCCCCCCCCCCH------------ T ss_conf --------------------------------------------------------554655368500------------ Q ss_pred CCCCHHHHHCCHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCEECCCCCCCEEEEEEECCCCCCCCCCCCCCCCCCCCC Q ss_conf 43203454131458999886531111245554302553237861037777741577631123454533322211134672 Q gi|254780802|r 270 HSISEKLSCDNTDIKEFCDEEKQKGTSLSVLDKTEKKGIYTGIHVKHPLNPNVVIPVYIANFVFMNYGTGAIFGCPFADQ 349 (869) Q Consensus 270 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~G~~~~~P~~~~~~ipv~~~~~V~~~~GTG~V~~~P~h~~ 349 (869) T Consensus 171 --------------------------------------------Li~P---~c~~---~~~~------------------ 182 (573) T TIGR00398 171 --------------------------------------------LINP---RCVI---CKNK------------------ 182 (573) T ss_pred --------------------------------------------HCCC---CEEE---ECCE------------------ T ss_conf --------------------------------------------1187---0255---4880------------------ Q ss_pred CCCHHHHCCCCCCCCCCCCCCCCCCCCCCHHHCCCCCCCCCCHHHCCCCHHHHHHHHHHHHHHHCCCCCCH--HHHH--- Q ss_conf 11012210354432101677655542221121012334458300013564665488899997404677520--2221--- Q gi|254780802|r 350 RDMDFAKKYGLPIIPIMKRSINHSQDIEEGKAFSGDGIMINSSFLDGMTNTEALQAVMSHLEKQNIKNSPI--GKRK--- 424 (869) Q Consensus 350 ~D~~~~~k~glpi~~v~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~g~~~~~~~~~i~~~l~~~~~~~~~~--~~~~--- 424 (869) T Consensus 183 --------------~~~~~~~hy--------------------F---f~L~~~~~~l~~~~~~~~~~~~~~~~~~n~~~~ 225 (573) T TIGR00398 183 --------------PELRDSEHY--------------------F---FRLSAFEKELEEWIKKNPESKSPASNVKNVAKQ 225 (573) T ss_pred --------------EEEECCCCC--------------------C---CCCHHHHHHHHHHHHCCCCCCCHHHHHHHHHHH T ss_conf --------------025135452--------------------2---353688899999861488424218999999889 Q ss_pred --HHHHCCCCCCCCCCC---CCCCCCCCCCCCCCCEECCCCCCCHHHHCCCCCCCCCCCCCHHHHHHHHHHCCCCCCCCC Q ss_conf --110001112211232---222234223334684634742000111001000224542100245642110136764435 Q gi|254780802|r 425 --INFRLRDWCISRQRS---WGCPIPVIHCQKCGIVELPKEDLPVQLPEDLDFTLPGNPLENHPTWKKIFCVKCGSEALR 499 (869) Q Consensus 425 --~~~~l~DW~ISRqr~---WG~piPv~~~~~~~~~~~~~~~l~v~~~~d~~~~~~~~~l~~~~~~~~~~~~~~~~~~~r 499 (869) T Consensus 226 ~~~~~GL~D~~ItR~~~~lkWG~pvP~~~~p------------------------------------------------- 256 (573) T TIGR00398 226 NWIKGGLKDLAITRDLVDLKWGIPVPNDGAP------------------------------------------------- 256 (573) T ss_pred HHHCCCCCCCEEECCCCCCCCCCCCCCCCCC------------------------------------------------- T ss_conf 9850687430110364412115317898987------------------------------------------------- Q ss_pred CCCCCCCCCCCCCCCCCCCCCCCCCCCHHHHHHHCCCHHHHCCCCCCCCCCCHHHHHHHHHCCCCCCCCCCCCCCCCCCC Q ss_conf 64323456664333223355565441013566411433440145554433202345553201347873223200222235 Q gi|254780802|r 500 ETDTMDTFVDSSWYYMRYMTPHAKDPINKELVRQWFPVDQYIGGIEHAVLHLLYARFFAHILKKIGYIEIDEPFKRLFTQ 579 (869) Q Consensus 500 ~~dvld~w~dS~~~~~~~~~~~~~~~~~~e~~~~~~P~D~~i~g~d~~~~~~~~~r~~~~~l~~~g~~~~~~pf~~l~~~ 579 (869) T Consensus 257 -~~~~YVW~DAl~gYiss~~~~~~~~~~~~~~~~~W~~~~----~~~~~~Hf------------IGK--DI~~FH~iyWP 317 (573) T TIGR00398 257 -NKVVYVWFDALIGYISSLKALGIEKGLTEDWKKWWNNNS----EDAELIHF------------IGK--DIVRFHTIYWP 317 (573) T ss_pred -CCEEEEEECHHHHHHHHHHHCCCCCCCCHHHHHHCCCCC----CCCEEEEE------------ECC--CCCCHHHHHHH T ss_conf -967998720345699997521335687578998626888----65027888------------424--12020333445 Q ss_pred CCCCCCCCCCCCCCCCEEECCCHHHCCCCCCCCCCCEECCCCEEEECCCCCCHHHCCCCCCCCC-CCCC-CCHHHHHHHH Q ss_conf 5323224332358700130620221025677754411048970640474210000001222210-0123-4633566655 Q gi|254780802|r 580 GMVVHETYYQLEGIKKKYLKPDEVILRNIEGENCAFRLSDNSKVVIGPLEKMSKSKKNVIDPMK-VIKS-YGADTARLFV 657 (869) Q Consensus 580 G~v~~~~~~~~~~~~~~~~~p~~~~~~~~~~~~~~~~~~~~~~~~~~~g~KMSKSkGNvi~p~~-~i~~-yGaD~lRl~~ 657 (869) T Consensus 318 a~L~~~~--------eN~~lP~q~--------------~~-hGyl~~eG~KMSKS~G~vv~~~~~~~~~~~g~D~lRYYl 374 (573) T TIGR00398 318 AMLMGLG--------ENLPLPTQV--------------FA-HGYLTVEGQKMSKSLGNVVDPEDDLLARGYGADILRYYL 374 (573) T ss_pred HHHHHCC--------CHHHHHHHH--------------EE-EEEEEECCEEECCCCCCEECHHHHHHHCCCCHHHHHHHH T ss_conf 8885112--------100212132--------------43-016884784432324753232178764478805788899 Q ss_pred HHCCCCCCCCCCCCCCH---------HHHHHHHHHHHHHHHHHHCCCC-----------------CCCCHHHHHHHHHHH Q ss_conf 30133211111343210---------1145567788999997630246-----------------678975699999999 Q gi|254780802|r 658 LSDSPPDRDIIWSNKGV---------DSTYQFIQQIWRLIYNAKDELQ-----------------TSSTKKDISLISKST 711 (869) Q Consensus 658 ~~~~~~~~d~~~s~~~i---------~~~~rfl~kl~~l~~~~~~~~~-----------------~~~~~~D~~ils~~~ 711 (869) T Consensus 375 ~~~~~~~~D~~F~~~~f~~r~N~~L~n~lGNl~nR~~~f~~k~f~g~~~~~~~~nfqfqeifqneP~l~~~~~~l~~~~~ 454 (573) T TIGR00398 375 LKEVPLGKDGDFSWEDFVERVNADLANDLGNLLNRTLGFIKKYFNGVLPSVDETNFQFQEIFQNEPKLTEEDKELLKKIN 454 (573) T ss_pred HHHCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCHHHHHHHHHHHHHCCCCCCHHHHHHHHHHH T ss_conf 86424344765688999999768877655589999999998873562110101234566665037652235668999999 Q ss_pred HHHHHHHHHHHHCCHHHHHHHHHHHHHHHHHHHHHHCCCCCC------CCHHHHHHH---HHHHHHHHHCCCHHHHHHHH Q ss_conf 999999999881688999999999999999999862110002------217999999---99999999722343899999 Q gi|254780802|r 712 KFLERIEENYQNLSFNKAVANIHELVNVISKPLMEIAKKKSN------ADRISTIRY---ILEKLIIMMSPMIPHLAEEC 782 (869) Q Consensus 712 ~~i~~v~~~~e~~~f~~ai~~i~~f~n~ls~~y~~~~k~~~~------~~~~~~l~~---vl~~l~~lLaPi~PhiaEEi 782 (869) T Consensus 455 ~~~~~~~~~~~~~~f~~Al~~~~~L~~~gNkyi~~~~PW~l~k~~~~~~~l~~~~~~~~e~~~~l~~Ll~P~~P~~~~k~ 534 (573) T TIGR00398 455 ETLEQIDKALESFEFRKALEEILKLADRGNKYIDDNEPWELAKQSEKLKELLAVCSLVAELIRVLSILLYPFMPKLSEKI 534 (573) T ss_pred HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCEEECCCHHHHHHHHHHHHHHHHHHHHHHHHCCCHHHHHHHH T ss_conf 99999999886203899999999999986147652388713257067999999999999999999998424102478999 Q ss_pred HHHCCCC Q ss_conf 9982899 Q gi|254780802|r 783 WQLLGNA 789 (869) Q Consensus 783 w~~Lg~~ 789 (869) T Consensus 535 ~~~~n~~ 541 (573) T TIGR00398 535 LKLLNFE 541 (573) T ss_pred HHHHCCC T ss_conf 9983887

HHsearch alignment for GI: 254780802 and conserved domain: TIGR00398