>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=579.80 Aligned_cols=300 Identities=41% Similarity=0.759 Sum_probs=276.2 Q ss_pred EEEEECCCCCCCCCCCHHHHHHHHHHHHHHHHHHHCCCCEEECCCCCCCCHHHHHHHHHCCC----------CHHHHHHH Q ss_conf 17997888999988322247897899999999885898036236437022799999998399----------98999999 Q gi|255764461|r 6 KLYISTAIAYPNAQPHIGHAYEMIIADVLARFHRLDGLDVLFTTGTDEHGQKIAKAAQNAGV----------TTKVFVDQ 75 (511) Q Consensus 6 ~~~vt~~~Py~ng~lHlGH~~~~i~~D~~~R~~r~~G~~v~~~~g~D~hg~~i~~~A~~~g~----------~p~e~~~~ 75 (511) T Consensus 1 ~~~i~~~~P~~nG~LHiGHar~~~~~Dv~~R~~r~~G~~V~~v~g~D~~G~~i~~~a~~~~~~~~~~~~~~~~~~~~~~~ 80 (334) T cd00668 1 KFYITTPPPYVNGVLHLGHALTYTLKDIIARYKRMRGYNVLFPPGWDEHGLPIENKAEKEGGIEGKKEEFLEDPKEWVDK 80 (334) T ss_pred CEEEECCCCCCCCCHHHHHHHHHHHHHHHHHHHHHCCCCEEECCCCCCCCHHHHHHHHHHCCCCCCHHHHHHHHHHHHHH T ss_conf 98995599888886146675989999999999981699536068668656899999999687121057777539999999 Q ss_pred HHHHHHHHHHHHCCCCC--CCCCCCCHHHHHHHHHHHHHHHHHHCCCCCCHHHHCCCCCCCCCCHHHHCCCCCCCCCCCC Q ss_conf 99999999998088988--6747788889999999988875431022110001011334301556672111222222223 Q gi|255764461|r 76 NSRNFRDMADVLDISYD--DFIRTTEKRHHDTCRILWKKISDKGDIYKGCYSGWYSLRDEAYYNDDEVYKGADGQYYNAQ 153 (511) Q Consensus 76 ~~~~~~~~~~~~~i~~D--~~~rT~~~~~~~~~~~~~~~l~~~G~iy~~~~~~~y~~~~~~~~~~~~v~~~~~~~~~~~~ 153 (511) T Consensus 81 ~~~~~~~~~~~lgi~~D~~~~~~T~~~~~~~~v~~~~~~L~~~G~iy~~~~~v--------------------------- 133 (334) T cd00668 81 YIEEFKEQFKRLGISFDWDRFYRTTDPEYYEAVQWIFLKLYEKGLIYRGERPV--------------------------- 133 (334) T ss_pred HHHHHHHHHHHHCCCCCCCCCEECCCHHHHHHHHHHHHHHHHCCCEEEECCCC--------------------------- T ss_conf 99999999999689768787611599999999999999999879989505667--------------------------- Q ss_pred CCCEECCCCCCCCCCCCCCCCCCCCCCCCCCCCCCHHHHHHHHHHHCCCCCCCCCCCCCCCCCCCCCCC----------- Q ss_conf 320000345443446664444434443333210006765457754103456753234333777657864----------- Q gi|255764461|r 154 HNPVQWMEEEGYFFRLSAYQDKLLSYYESHPEFILPIERRNEVISFVKSGLKDLSLSRKTFDWGIKIPD----------- 222 (511) Q Consensus 154 ~~p~~~~~~~~~f~~l~~~~~~l~~~~~~~~~~~~p~~~~~~~~~wl~~gl~Dw~ISR~~~~WGipiP~----------- 222 (511) T Consensus 134 ------~~~~~~f~~~~~~~~~l~~~~~~~~--~~p~~~~~~~~~~l~~~~~d~~isR~~-~wG~~~P~~~~~~~~~~~~ 204 (334) T cd00668 134 ------RLTEQWFLKLSKLKDRLLEALEKNE--IWPENVRNRFLNWLENGLRDWCISRQR-YWGIPIPAWYCEDCGEVCP 204 (334) T ss_pred ------CCCCEEEEEHHHHHHHHHHHHHHCC--CCCHHHHHHHHHHHHCCCCCCEEEEEC-CCCCCCCEEECCCCCCCCC T ss_conf ------7565477788999999999998489--877899999998874678775257334-6787556133256775566 Q ss_pred -------CCCCCCCCCHHHHHHHHCCCCCCCCCCC--CCCCCCCCCHHCCCCCCCCHHCCHHHHHHHHH-HHHCCCCCCC Q ss_conf -------2221464602444322001234676543--10002411000045643210001024776543-3101232333 Q gi|255764461|r 223 -------DPQYIMYVWIDALTNYLTTTGYLDNPDG--SKAKFWPADLHVIGKDILRFHAIYWPAFLLSA-NLPLPKKVFS 292 (511) Q Consensus 223 -------~~~~~~YVWfDa~~gY~s~~~~~~~~~~--~~~~~w~~d~~~~G~Dii~Fh~i~~pa~l~~~-~~~~p~~i~~ 292 (511) T Consensus 205 ~~~~~~~~~~~~~~~Wfds~~~~~~~~~~~~~~~~~~~~~~~~~~di~~~G~D~~~~h~~~~~a~~~a~~~~~~~~~~~~ 284 (334) T cd00668 205 KCGKELKRETDVLDVWFDSGIGYLSALGYPNEEEGFEEFEYWYPADLHVIGKDIIRFHLIYWPAMLLALFGKPPPKNVLV 284 (334) T ss_pred CCCCCCCCCCCCEEEEECCCCCCCCCCCCCCCCCHHHHHHCCCCEEEEEECCCHHHHHHHHHHHHHHHCCCCCCHHHEEE T ss_conf 65311368765344664175654322678643325668761798169871561363299999999998449850877574 Q ss_pred CCCEEE-CCCCCCHHHCCCCCCCCHHHHCCCCCCCHHHEEECCCCCCCEE Q ss_conf 430330-5860100000221110000002211121110000247873011 Q gi|255764461|r 293 HGFILH-KGEKISKSLGNVIDPIEVIEEVGVDALRYFLVREIACGKDGFY 341 (511) Q Consensus 293 ~g~l~~-~G~KMSKS~GN~I~~~e~l~~~g~D~lR~~l~~~~~~~~D~~F 341 (511) T Consensus 285 ~g~~~~~~G~KMSKS~GN~i~~~~~l~~~g~D~lR~~l~~~~~~~~d~~f 334 (334) T cd00668 285 HGLVLDEGGRKMSKSLGNVVDPLDAIEKYGADALRYYLLSAAPEGEDLNF 334 (334) T ss_pred CCCEECCCCCCCCCCCCCCCCHHHHHHHCCCHHHHHHHHHCCCCCCCCCC T ss_conf 20198389957388699888989999875948999999942998889998

HHsearch alignment for GI: 255764461 and conserved domain: cd00668