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Crystal structure of Escherichia coli methionyl-tRNA synthetase highlights species-specific features.

作者信息

Mechulam Y, Schmitt E, Maveyraud L, Zelwer C, Nureki O, Yokoyama S, Konno M, Blanquet S

机构信息

Laboratoire de Biochimie, Ecole Polytechnique, CNRS UMR 7654, Palaiseau Cedex, F-91128, France.

出版信息

J Mol Biol. 1999 Dec 17;294(5):1287-97. doi: 10.1006/jmbi.1999.3339.

DOI:10.1006/jmbi.1999.3339
PMID:10600385
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.

摘要

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