>cd00814 MetRS_core This is the catalytic core domain of methionine tRNA synthetase (MetRS). This class I enzyme aminoacylates the 2'-OH of the nucleotide at the 3' of the appropriate tRNA. MetRS, which consists of the core domain and a anti-codon binding domain functions as a monomer. However, in some species, the anti-codon binding domain is followed by an EMAP domain. In this case, MetRS functions as a homodimer. 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. As a result of a deletion event, MetRS has a significantly shorter core domain insertion that IleRS, ValRS, and LeuR. Consequently, the MetRS insertion lacks the editing function.

Probab=97.41 E-value=4.4e-05 Score=56.71 Aligned_cols=69 Identities=13% Similarity=0.158 Sum_probs=35.2 Q ss_pred EEEEECCCCCC----CEEECCCCCCCCCCCCHHHHHHHHHCCCC-EEEEEECCCCCCCCCHHHHHHHHHHCCCCCCHHHE Q ss_conf 26663377666----31414677667643320477778752984-14874135666687513668888640875301210 Q gi|254780573|r 191 FILWKRSTPME----PGWESPWGRGRPGWHIECSAMSSHYLGKV-FDIHGGGLDLIFPHHENEIAQSCCADRIEKTANIW 265 (461) Q Consensus 191 FaLWK~~~~~e----~~w~spwG~GRPGWHiECsam~~~~lg~~-~DIH~GG~DL~FPHHENEiAQs~a~~~~~~~a~yW 265 (461) T Consensus 203 ~yvW~da~~gy~~~~~~~~--~~~~~~~~~~~~~~~~ih~~G~Di~~~H~----~~~~a~--~~a~~~~~~~-~~~~~g~ 273 (319) T cd00814 203 IYVWFDALIGYISATGYYT--DEWGNSWWWNDPWPELVHFIGKDIVPFHA----IYWPAM--LLGAGLPLPT-RIFAHGY 273 (319) T ss_pred EECCHHCCCCCCCCCCCCC--CCCCCCCCCCCCCCCEEEEECCCCCCHHH----HHHHHH--HHHCCCCCCC-EEEECCE T ss_conf 3002101234000146666--65687644456884126784476431888----789999--9856998786-8887023 Q ss_pred ECC Q ss_conf 034 Q gi|254780573|r 266 IHN 268 (461) Q Consensus 266 lH~ 268 (461) T Consensus 274 l~~ 276 (319) T cd00814 274 LTV 276 (319) T ss_pred EEE T ss_conf 998

HHsearch alignment for GI: 254780573 and conserved domain: cd00814