PMID: 2504923Jul 5, 1989Paper

Structure of tyrosyl-tRNA synthetase refined at 2.3 A resolution. Interaction of the enzyme with the tyrosyl adenylate intermediate

Journal of Molecular Biology
P BrickD M Blow

Abstract

The crystal structure of tyrosyl-tRNA synthetase (EC 6.1.1.1) from Bacillus stearothermophilus has been refined to a crystallographic R-factor of 22.6% at 2.3 A resolution using a restrained least-squares procedure. In the final model the root-mean-square deviation from ideality for bond distances is 0.018 A and for angle distances is 0.044 A. Each monomer consists of three domains: an alpha/beta domain (residues 1 to 220) containing a six-stranded beta-sheet, an alpha-helical domain (248 to 318) containing five helices, and a disordered C-terminal domain (319 to 418) for which the electron density is very weak and where it has not been possible to trace the polypeptide chain. Complexes of the enzyme with the catalytic intermediate tyrosyl adenylate and the inhibitor tyrosinyl adenylate have also been refined to R-factors of 23.9% at 2.8 A resolution and 21.0% at 2.7 A resolution, respectively. Formation of the complexes results in some crystal cracking, but there is no significant difference in the conformation of the polypeptide chain of the three structures described here. The relative orientation of the alpha/beta and alpha-helical domains is similar to that previously observed for the "A" subunit of a deletion mutant lacki...Continue Reading

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