>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=99.65 E-value=6.3e-14 Score=116.68 Aligned_cols=380 Identities=21% Similarity=0.284 Sum_probs=217.4 Q ss_pred CCCCCCCCHHHHH-HHHHHHHHHHHHHHCCCCCCEEECCCCCCHHHHHHHHHHHHHHHHHCCCCCCCCCHHHCCCCCHHH Q ss_conf 4322441177777-856899999999850666410201477531455567898753222102450006601102410000 Q gi|254780285|r 130 ANPTGPMHVGHCR-CAVVGDTLASLMAFSGYEVTREYYINDAGAQINTLALSVFWRYQQALYNNDSDLPEGYYPGVYLKH 208 (586) Q Consensus 130 pNp~KplHVGHlR-saiIGdsi~ril~~~G~~V~r~nyvgD~G~Q~~~li~~~~~~~~~~~~~~~~~~~e~~~~~~y~~~ 208 (586) T Consensus 8 ~Y~Ng~pHlGH~~st~~~AD~~~RY~~~~G~~v~---f~-----------cG-----------TD----EHG~k------ 52 (573) T TIGR00398 8 PYANGKPHLGHAYSTTILADVYARYKRLRGYEVL---FV-----------CG-----------TD----EHGTK------ 52 (573) T ss_pred CCCCCCHHHHHHHHHHHHHHHHHHHHHCCCCEEE---EE-----------EC-----------CC----CCCCH------ T ss_conf 6678711210366777899999999852897478---98-----------51-----------34----46878------ Q ss_pred HHHHHHHHHHHHHHCCCCHHH-HHHHHHHHHHHHHHHHHHHHHHCCCCCCCEECHHHHHHCCHHHHHHHHHHHHHCCCCC Q ss_conf 127888887576413430237-9999999789988754555887087521000158873010457999999999749851 Q gi|254780285|r 209 VGKELADKYSSELLNFPEEKW-LPIVKDYSVQAMMKIIRDDLKALNIQHDIFISEDDFHRGDPSPIRDIIDNLARQGYVY 287 (586) Q Consensus 209 ~~~e~~~~~~~~~~~~~e~~~-~~~~~~~~~~~~~~~~~~~l~~l~i~fD~~~~Es~~~~~~~~~i~~~i~~l~~~g~~~ 287 (586) T Consensus 53 ----I~~~-A~~-~g----~tqP~~----~vd~~~~~f~~~~~~lnI~fD~F~RTTd~~--H~~~v~~~f~~L~~nGyIY 116 (573) T TIGR00398 53 ----IELK-AEQ-EG----LTQPKE----LVDKYHEEFKKLWKWLNISFDRFIRTTDEE--HKEIVQKIFQKLLENGYIY 116 (573) T ss_pred ----HHHH-HHH-CC----CCCHHH----HHHHHHHHHHHHHHHHCCCCCCCCCCCCHH--HHHHHHHHHHHHHHCCCCC T ss_conf ----8886-987-08----996489----999999999999987284567654676888--8999999999987537741 Q ss_pred CCCC----CCC--------------CCCCCCCCC--------------------CCCCC---------------EEEEHH Q ss_conf 1342----675--------------556542000--------------------24781---------------565101 Q gi|254780285|r 288 EGIL----PPP--------------KSKTTQKCD--------------------MDRKQ---------------LLFRST 314 (586) Q Consensus 288 e~~~----~~~--------------~~~~~~~~~--------------------~~~~~---------------~~~~~~ 314 (586) T Consensus 117 ~~~~~g~YC~~c~~Fl~dr~~~~~yv~g~CP~c~~~~~~gd~c~~Cg~~leP~~Li~P~c~~~~~~~~~~~~~hyFf~L~ 196 (573) T TIGR00398 117 EKEIKGLYCPECESFLPDRKLVDDYVEGTCPKCGSEDARGDHCEVCGRHLEPFELINPRCVICKNKPELRDSEHYFFRLS 196 (573) T ss_pred HHCCCCCCCCCCCCCCCHHHHHCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCHHCCCCEEEECCEEEEECCCCCCCCCH T ss_conf 10035323475665362232001334674886887777787755465536850011870255488002513545223536 Q ss_pred HCCCCC-----------------CCCC-C--CCCCCH-HHHHHHHHHHHHHHH--C--CCCCCCCCCCCCHHHHHHHHH- Q ss_conf 102222-----------------2221-0--246521-356888999999752--2--555433367776136899999- Q gi|254780285|r 315 MVGDDV-----------------DRPL-L--KSDGSY-TYFAADLAYFKCKYE--R--GFDNMIYVMGSDHSGYVKRLE- 368 (586) Q Consensus 315 ~~g~~~-----------------d~vl-~--rsDGt~-~Y~t~DiA~~~~k~e--~--~~d~~iyVv~~~Q~~h~~~v~- 368 (586) T Consensus 197 ~~~~~l~~~~~~~~~~~~~~~~~~n~~~~~~~~~GL~D~~ItR~~~~lkWG~pvP~~~~p~~~~YVW~DAl~gYiss~~~ 276 (573) T TIGR00398 197 AFEKELEEWIKKNPESKSPASNVKNVAKQNWIKGGLKDLAITRDLVDLKWGIPVPNDGAPNKVVYVWFDALIGYISSLKA 276 (573) T ss_pred HHHHHHHHHHHCCCCCCCHHHHHHHHHHHHHHCCCCCCCEEECCCCCCCCCCCCCCCCCCCCEEEEEECHHHHHHHHHHH T ss_conf 88899999861488424218999999889985068743011036441211531789898796799872034569999752 Q ss_pred -----------------------------------------HHHHHHC--CCCCCCEEEECCHHHCCCCCCCCCCCCCCC Q ss_conf -----------------------------------------9999722--663451153110110122110000012233 Q gi|254780285|r 369 -----------------------------------------AVAAAVS--EKKAQINVLLCELVRLYRDGMPIKMSKRAG 405 (586) Q Consensus 369 -----------------------------------------~~~~~lg--~~~~~~~~~~~~~v~l~~dg~~~kmstR~G 405 (586) T Consensus 277 ~~~~~~~~~~~~~~W~~~~~~~~~~HfIGKDI~~FH~iyWPa~L~~~~eN~~lP~-q~~~hGyl~~--eG~--KMSKS~G 351 (573) T TIGR00398 277 LGIEKGLTEDWKKWWNNNSEDAELIHFIGKDIVRFHTIYWPAMLMGLGENLPLPT-QVFAHGYLTV--EGQ--KMSKSLG 351 (573) T ss_pred CCCCCCCCHHHHHHCCCCCCCCEEEEEECCCCCCHHHHHHHHHHHHCCCHHHHHH-HHEEEEEEEE--CCE--EECCCCC T ss_conf 1335687578998626888650278884241202033344588851121002121-3243016884--784--4323247 Q ss_pred CHHHHHH-HHHH-HHHHHHHHHHHHH-CCHHHHHHHHHHHHHH-------CCCCHHHHHHHHHHHHHHHHHHHH-HHCCC Q ss_conf 0245677-7776-3211234555420-0012333447776532-------024436788888888999987533-20024 Q gi|254780285|r 406 DFITLRH-VVDE-VGSDSVRFMMLWR-KNSELLDFDFCKVKEQ-------SKENPVFYVQYAYARCRSIFRQAK-DIFPD 474 (586) Q Consensus 406 ~~v~l~d-ll~e-vg~~aiky~~L~~-~~~~~~~Fd~d~~l~~-------~~~nt~~YiqYa~aR~~SIlrKa~-~~~~~ 474 (586) T Consensus 352 ~vv~~~~~~~~~~~g~D~lRYYl~~~~~~~~D~~F~~~~f~~r~N~~L~n~lGNl~-------nR~~~f~~k~f~g~~~~ 424 (573) T TIGR00398 352 NVVDPEDDLLARGYGADILRYYLLKEVPLGKDGDFSWEDFVERVNADLANDLGNLL-------NRTLGFIKKYFNGVLPS 424 (573) T ss_pred CEECHHHHHHHCCCCHHHHHHHHHHHCCCCCCCCCCHHHHHHHHHHHHHHHHHHHH-------HHHHHHHHHHHCCCCCC T ss_conf 53232178764478805788899864243447656889999997688776555899-------99999998873562110 Q ss_pred CCCCCCC-CCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHCCCHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCCCH Q ss_conf 6832234-223552114998999999998421899999998528127999999999988999870686666654357878 Q gi|254780285|r 475 LDFDLFP-RNVIPQESEFDTSELQLIVHLAEYPRVIENATIAQEPYKLAFYLYDLASVFHGHWSHGRENPRLRFVQANNR 553 (586) Q Consensus 475 ~~~~~~~-~~~~~~~~~~~~~E~~L~~~l~~f~~vi~~a~~~~~P~~l~~Yl~~La~~Fn~fY~~~~~~~~~~v~~~~~~ 553 (586) T Consensus 425 ~~~~nfqfqeifqneP~l~~~~~~l~~~~~~~~~~~~~~~~~~~f~~Al~~~~~L~~~gNkyi~~~~--PW~--l~k~~~ 500 (573) T TIGR00398 425 VDETNFQFQEIFQNEPKLTEEDKELLKKINETLEQIDKALESFEFRKALEEILKLADRGNKYIDDNE--PWE--LAKQSE 500 (573) T ss_pred HHHHHHHHHHHHHCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCC--CCE--EECCCH T ss_conf 1012345666650376522356689999999999999988620389999999999998614765238--871--325706 Q ss_pred HHHHHHHHHHHHHHHHHHHHHHHC Q ss_conf 999999999999999999987315 Q gi|254780285|r 554 KLTMMRLQLVHAVASIINSGLNII 577 (586) Q Consensus 554 ~~~~~RL~L~~a~~~vL~~~L~LL 577 (586) T Consensus 501 ~~~-~l~~~~~~~~e~~~~l~~Ll 523 (573) T TIGR00398 501 KLK-ELLAVCSLVAELIRVLSILL 523 (573) T ss_pred HHH-HHHHHHHHHHHHHHHHHHHH T ss_conf 799-99999999999999999984

HHsearch alignment for GI: 254780285 and conserved domain: TIGR00398