title: Crystallization and preliminary X-ray studies of azoreductases from Bacillus sp. B29.
abstract: Azoreductases from Bacillus sp. B29 are NADH-dependent flavoenzymes which contain a flavin mononucleotide (FMN) as a prosthetic group and exist as homodimers composed of 23 kDa subunits. These enzymes catalyze the reductive degradation of various azo compounds by a ping-pong mechanism. In order to determine the structure-function relationship of the azo-dye reduction mechanism, an X-ray crystallographic study of azoreductases was performed. Selenomethionine-labelled AzrA (SeMet-AzrA) and AzrC were crystallized by the hanging-drop vapour-diffusion method. A crystal of SeMet-AzrA diffracted to 2.0 A resolution and was determined to belong to space group P2(1)2(1)2(1), with unit-cell parameters a = 56.9, b = 69.0, c = 105.4 A. The native crystals of AzrC belonged to space group C2, with unit-cell parameters a = 192.0, b = 56.6, c = 105.5 A, beta = 115.7 degrees , and diffracted to 2.21 A resolution.
authors.affiliation: Division of Biotechnology and Macromolecular Chemistry, Graduate School of Engineering, Hokkaido University, Sapporo, Japan.
authors.forename: Daiki
authors.initials: D
authors.lastname: Ogata
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Ooi
authors.forename: Takaaki
authors.initials: T
authors.lastname: Fujiwara
authors.forename: Seiichi
authors.initials: S
authors.lastname: Taguchi
authors.forename: Isao
authors.initials: I
authors.lastname: Tanaka
authors.forename: Min
authors.initials: M
authors.lastname: Yao
mesh_terms: D001407:Bacillus / Q000201:enzymology*; D003460:Crystallization; D018360:Crystallography, X-Ray; D009247:NADH, NADPH Oxidoreductases / Q000737:chemistry*; D009601:Nitroreductases
chemical_list: D009247:NADH, NADPH Oxidoreductases; D009601:Nitroreductases; C021106:azoreductase
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