>cd00668 Ile_Leu_Val_MetRS_core This is the catalytic core domain of isoleucyl, leucyl, valyl and methioninyl tRNA synthetases. These class I enzymes are all monomers. However, in some species, MetRS functions as a homodimer, as a result of an additional C-terminal domain. These enzymes aminoacylate the 2'-OH of the nucleotide at the 3' of the appropriate tRNA. The core domain is based on the Rossman fold and is responsible for the ATP-dependent formation of the enzyme bound aminoacyl-adenylate. It contains the characteristic class I HIGH and KMSKS motifs, which are involved in ATP binding. Enzymes in this subfamily share an insertion in the core domain, which is subject to both deletions and rearrangements. This editing region hydrolyzes mischarged cognate tRNAs and thus prevents the incorporation of chemically similar amino acids. MetRS has a significantly shorter insertion, which lacks the editing function.

Probab=100.00 E-value=0 Score=379.51 Aligned_cols=274 Identities=18% Similarity=0.180 Sum_probs=207.1 Q ss_pred EEEECCCCCCCCCCCCCHHHHHHHHHHHHHHHHCCCCCEEEEECCCC-----CCHHHHHHHHHCCCCCCCCCCHHHHHHH Q ss_conf 99616788884441112799999999999997079984579960552-----3388899998708986448848999999 Q gi|254780573|r 28 MYVCGPTVYDFAHIGNARPMIVFDVLYRLLRYYYGEKCVTYVRNITD-----IDDKIIERARQEHPSIPINDAISIITSK 102 (461) Q Consensus 28 ~Y~CGpTvy~~~HiG~~r~~v~~D~l~R~L~~~~~~~~V~~v~niTD-----idDkii~~a~~~~~~~~~~~~~~~~a~~ 102 (461) T Consensus 4 i~~~~P~~nG~LHiGHar~~~~~Dv~~R~~r~~G~~--V~~v~g-~D~~G~~i~~~a~~~~~~~~~~~~~~~~~~~~~~~ 80 (334) T cd00668 4 ITTPPPYVNGVLHLGHALTYTLKDIIARYKRMRGYN--VLFPPG-WDEHGLPIENKAEKEGGIEGKKEEFLEDPKEWVDK 80 (334) T ss_pred EECCCCCCCCCHHHHHHHHHHHHHHHHHHHHHCCCC--EEECCC-CCCCCHHHHHHHHHHCCCCCCHHHHHHHHHHHHHH T ss_conf 955998888861466759899999999999816995--360686-68656899999999687121057777539999999 Q ss_pred HHHHHHHHHHHHCCCCCCHHHHHH---HHHHHHHHHHHHHHHCCCCCCCCCCE------EECCHHCCCCCC--CCCCCH- Q ss_conf 999999987762685410001235---67777899999874114320128928------752200245432--246754- Q gi|254780573|r 103 NTQQFVKDTTRLACLAPTHQPRAT---NHIPQMIYLIQNIILHGHAYEANNEI------IFDTSSIPNYGS--FSRRKI- 170 (461) Q Consensus 103 ~~~~f~~d~~~L~v~~p~~~pr~t---~~i~~~i~~i~~L~~~g~aY~~~g~V------yFdv~~~~~YG~--Ls~~~~- 170 (461) T Consensus 81 ~~~~~~~~~~~lgi~~D~~~~~~T~~~~~~~~v~~~~~~L~~~G~iy~~~~~v~~~~~~f~~~~~~~~~l~~~~~~~~~~ 160 (334) T cd00668 81 YIEEFKEQFKRLGISFDWDRFYRTTDPEYYEAVQWIFLKLYEKGLIYRGERPVRLTEQWFLKLSKLKDRLLEALEKNEIW 160 (334) T ss_pred HHHHHHHHHHHHCCCCCCCCCEECCCHHHHHHHHHHHHHHHHCCCEEEECCCCCCCCEEEEEHHHHHHHHHHHHHHCCCC T ss_conf 99999999999689768787611599999999999999999879989505667756547778899999999999848987 Q ss_pred -HHHHHHHHCCCCCCCCCCCC------------EEEEECCCC--------------CC---CEEECCCC-CCCCCCCCHH Q ss_conf -66664321022221012351------------266633776--------------66---31414677-6676433204 Q gi|254780573|r 171 -DEQKMGTRVPEKYHKKNPAD------------FILWKRSTP--------------ME---PGWESPWG-RGRPGWHIEC 219 (461) Q Consensus 171 -~~~~~g~r~~~~~~K~~p~D------------FaLWK~~~~--------------~e---~~w~spwG-~GRPGWHiEC 219 (461) T Consensus 161 p~~~~~--~~~~-~l~~~~~d~~isR~~~wG~~~P~~~~~~~~~~~~~~~~~~~~~~~~~~~Wfds~~~~~~~~~~~~~~ 237 (334) T cd00668 161 PENVRN--RFLN-WLENGLRDWCISRQRYWGIPIPAWYCEDCGEVCPKCGKELKRETDVLDVWFDSGIGYLSALGYPNEE 237 (334) T ss_pred CHHHHH--HHHH-HHHCCCCCCEEEEECCCCCCCCEEECCCCCCCCCCCCCCCCCCCCCEEEEECCCCCCCCCCCCCCCC T ss_conf 789999--9998-8746787752573346787556133256775566653113687653446641756543226786433 Q ss_pred HHHHHHHCCCCEEEEEECCCCCCCCCHHHHHHHHHHCCCCCCHHHEECCCEEEE-EECCCCCCCCCCCCHHHHHCCCCCC Q ss_conf 777787529841487413566668751366888864087530121003432576-4202233233214089985025334 Q gi|254780573|r 220 SAMSSHYLGKVFDIHGGGLDLIFPHHENEIAQSCCADRIEKTANIWIHNGFLNL-EGRKMSKSNGNFITINELLETKKFG 298 (461) Q Consensus 220 sam~~~~lg~~~DIH~GG~DL~FPHHENEiAQs~a~~~~~~~a~yWlH~G~l~i-~geKMSKSlGN~iti~dlL~~~~~~ 298 (461) T Consensus 238 ~~~~~~~~~~~~di~~~G~D~~~~h~~~~~a~~~a~~~~~~~~~~~~-~g~~~~~~G~KMSKS~GN~i~~~~~l------ 310 (334) T cd00668 238 EGFEEFEYWYPADLHVIGKDIIRFHLIYWPAMLLALFGKPPPKNVLV-HGLVLDEGGRKMSKSLGNVVDPLDAI------ 310 (334) T ss_pred CHHHHHHCCCCEEEEEECCCHHHHHHHHHHHHHHHCCCCCCHHHEEE-CCCEECCCCCCCCCCCCCCCCHHHHH------ T ss_conf 25668761798169871561363299999999998449850877574-20198389957388699888989999------ Q ss_pred CCCCCHHHHHHHHHCCC Q ss_conf 55777999999984256 Q gi|254780573|r 299 GRSWPAPVIRLAMLMTH 315 (461) Q Consensus 299 ~k~y~p~viR~~lLssh 315 (461) T Consensus 311 -~~~g~D~lR~~l~~~~ 326 (334) T cd00668 311 -EKYGADALRYYLLSAA 326 (334) T ss_pred -HHCCCHHHHHHHHHCC T ss_conf -8759489999999429

HHsearch alignment for GI: 254780573 and conserved domain: cd00668