1qqt
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METHIONYL-TRNA SYNTHETASE FROM ESCHERICHIA COLI
OverviewOverview
The 3D structure of monomeric C-truncated Escherichia coli methionyl-tRNA synthetase, a class 1 aminoacyl-tRNA synthetase, has been solved at 2.0 A resolution. Remarkably, the polypeptide connecting the two halves of the Rossmann fold exposes two identical knuckles related by a 2-fold axis but with zinc in the distal knuckle only. Examination of available MetRS orthologs reveals four classes according to the number and zinc content of the putative knuckles. Extreme cases are exemplified by the MetRS of eucaryotic or archaeal origin, where two knuckles and two metal ions are expected, and by the mitochondrial enzymes, which are predicted to have one knuckle without metal ion.
About this StructureAbout this Structure
1QQT is a Single protein structure of sequence from Escherichia coli with as ligand. Active as Methionine--tRNA ligase, with EC number 6.1.1.10 Full crystallographic information is available from OCA.
ReferenceReference
Crystal structure of Escherichia coli methionyl-tRNA synthetase highlights species-specific features., Mechulam Y, Schmitt E, Maveyraud L, Zelwer C, Nureki O, Yokoyama S, Konno M, Blanquet S, J Mol Biol. 1999 Dec 17;294(5):1287-97. PMID:10600385
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