PMID:10600385

Citation	Mechulam, Y, Schmitt, E, Maveyraud, L, Zelwer, C, Nureki, O, Yokoyama, S, Konno, M and Blanquet, S (1999) Crystal structure of Escherichia coli methionyl-tRNA synthetase highlights species-specific features. J. Mol. Biol. 294:1287-97
Abstract	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.
Links	PubMed Online version:10.1006/jmbi.1999.3339
Keywords	Amino Acid Sequence; Animals; Anticodon/metabolism; Binding Sites; Catalytic Domain; Crystallization; Crystallography, X-Ray; Escherichia coli/enzymology; Humans; Methionine-tRNA Ligase/chemistry; Methionine-tRNA Ligase/classification; Models, Molecular; Molecular Sequence Data; Protein Structure, Secondary; RNA, Transfer/chemistry; RNA, Transfer/metabolism; Sequence Alignment; Static Electricity; Zinc/metabolism
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