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X-ray structure of a dihydropyrimidinase from Thermus sp. at 1.3 A resolution.

Abstract：

:Dihydropyrimidinases (hydantoinases) catalyse the reversible hydrolytic ring-opening of cyclic diamides such as dihydropyrimidines in the catabolism of pyrimidines. In biotechnology, these enzymes find application in the enantiospecific production of amino acids from racemic hydantoins. The crystal structure of a D-enantio-specific dihydropyrimidinase from Thermus sp. (D-hydantoinase) was solved de novo by multiwavelength anomalous diffraction phasing. In spite of a large unit cell the D-hydantoinase crystals exhibit excellent diffraction properties. The structure was subsequently refined at 1.30 A resolution against native data. The core of D-hydantoinase consists of a (alpha/beta)(8)-barrel, which is flanked by a beta-sheet domain and some additional helices. In the active site, a carboxylated lysine residue and the catalytically active hydroxide ion bridge a binuclear zinc centre. The tertiary structure and shape of the active site show strong homology to that of ureases, dihydroorotases, and phosphotriesterases. The homology of the active site was exploited for in silicio docking of substrates in the active site. This could shed light both on the substrate binding in hydantoinases and on the recently highly discussed origin of the proton in the course of hydantoinase catalysis.

journal_name

J Mol Biol

journal_title

Journal of molecular biology

authors

Abendroth J,Niefind K,Schomburg D

doi

10.1016/S0022-2836(02)00422-9

keywords:

subject

Has Abstract

pub_date

2002-06-28 00:00:00

pages

143-56

issue

1

eissn

0022-2836

issn

1089-8638

pii

S0022-2836(02)00422-9

journal_volume

320

pub_type

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