title: Crystallization and preliminary crystallographic analysis of a flavoprotein NADH oxidase from Lactobacillus brevis.
abstract: NADH oxidase (NOX) from Lactobacillus brevis is a homotetrameric flavoenzyme composed of 450 amino acids per subunit. The molecular weight of each monomer is 48.8 kDa. The enzyme catalyzes the oxidation of two equivalents of NADH and reduces one equivalent of oxygen to yield two equivalents of water, without releasing hydrogen peroxide after the reduction of the first equivalent of NADH. Crystals of this protein were grown in the presence of 34% polyethylene glycol monomethyl ether 2000, 0.1 M sodium acetate and 0.2 M ammonium sulfate at pH 5.4. They belong to the tetragonal space group P4(3)2(1)2, with unit-cell parameters a = 74.8, b = 95.7, c = 116.9 A, alpha = gamma = 90, beta = 103.8 degrees. The current diffraction limit is 4.0 A. The self-rotation function of the native data set is consistent with a NOX tetramer in the asymmetric unit.
authors.affiliation: Institute of Molecular Enzyme Technology, Heinrich Heine University Düsseldorf, Research Centre Jülich, 52426 Jülich, Germany.
authors.forename: Mutlu
authors.initials: M
authors.lastname: Kuzu
authors.forename: Karsten
authors.initials: K
authors.lastname: Niefind
authors.forename: Werner
authors.initials: W
authors.lastname: Hummel
authors.forename: Dietmar
authors.initials: D
authors.lastname: Schomburg
mesh_terms: D003460:Crystallization; D018360:Crystallography, X-Ray; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D005420:Flavoproteins / Q000737:chemistry* / Q000378:metabolism; D052196:Levilactobacillus brevis / Q000201:enzymology* / Q000378:metabolism; D009097:Multienzyme Complexes / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism; D009247:NADH, NADPH Oxidoreductases / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D005420:Flavoproteins; D009097:Multienzyme Complexes; D011994:Recombinant Proteins; C023107:NADH oxidase; D009247:NADH, NADPH Oxidoreductases