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Template:STRUCTURE 1gln

ARCHITECTURES OF CLASS-DEFINING AND SPECIFIC DOMAINS OF GLUTAMYL-TRNA SYNTHETASE

Overview

The crystal structure of a class I aminoacyl-transfer RNA synthetase, glutamyl-tRNA synthetase (GluRS) from Thermus thermophilus, was solved and refined at 2.5 A resolution. The amino-terminal half of GluRS shows a geometrical similarity with that of Escherichia coli glutaminyl-tRNA synthetase (GlnRS) of the same subclass in class I, comprising the class I-specific Rossmann fold domain and the intervening subclass-specific alpha/beta domain. These domains were found to have two GluRS-specific, secondary-structure insertions, which then participated in the specific recognition of the D and acceptor stems of tRNA(Glu) as indicated by mutagenesis analyses based on the docking properties of GluRS and tRNA. In striking contrast to the beta-barrel structure of the GlnRS carboxyl-terminal half, the GluRS carboxyl-terminal half displayed an all-alpha-helix architecture, an alpha-helix cage, and mutagenesis analyses indicated that it had a role in the anticodon recognition.

About this Structure

1GLN is a Single protein structure of sequence from Thermus thermophilus. Full crystallographic information is available from OCA.

Reference

Architectures of class-defining and specific domains of glutamyl-tRNA synthetase., Nureki O, Vassylyev DG, Katayanagi K, Shimizu T, Sekine S, Kigawa T, Miyazawa T, Yokoyama S, Morikawa K, Science. 1995 Mar 31;267(5206):1958-65. PMID:7701318 Page seeded by OCA on Fri May 2 17:43:49 2008