>gnl|CDD|185674 cd00668, Ile_Leu_Val_MetRS_core, catalytic core domain of isoleucyl, leucyl, valyl and methioninyl tRNA synthetases. 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. Length = 312

 Score =  138 bits (349), Expect = 8e-33
 Identities = 51/140 (36%), Positives = 69/140 (49%), Gaps = 4/140 (2%)

Query: 38  VFCIAMPPPNVTGSLHMGHAFNTTIQDIMIRFERMRGKNVLWQPGTDHAGIATQITVESR 97
            F +  PPP   GSLH+GHA    I D + R++RMRG  V + PG D  G+  ++  E +
Sbjct: 1   KFYVTTPPPYANGSLHLGHALTHIIADFIARYKRMRGYEVPFLPGWDTHGLPIELKAERK 60

Query: 98  LFAQSSLTREDIGRDAFIEKVWEWKKESGGSILSQLKRLGASCDWSRERFTMDEGMSNAV 157
                   ++ I  + F E   E+ +E  G      +RLG S DWS E  T +   S AV
Sbjct: 61  G----GRKKKTIWIEEFREDPKEFVEEMSGEHKEDFRRLGISYDWSDEYITTEPEYSKAV 116

Query: 158 RNAFVVLYKDGLIYRDKRIV 177
              F  LY+ GLIYR    V
Sbjct: 117 ELIFSRLYEKGLIYRGTHPV 136