title: Reduction of nitrite to nitrous oxide by a cytoplasmic membrane fraction from the marine denitrifier Pseudomonas perfectomarinus.
abstract: A cytoplasmic membrane fraction from the marine denitrifier Pseudomonas perfectomarinus reduced nitrite to nitrous oxide in a stoichiometric reaction without nitric oxide as free intermediate. The membrane system had a specific requirement for FMN with NAD(P)H as electron donors. Other electron donors were ascorbate-reduced cytochrome c-551 or phenazine methosulfate. The membrane fraction contained tightly bound cytochrome cd which represented only a small portion of the total cytochrome cd of the cell. As further terminal oxidase cytochrome o was identified. The membrane fraction produced also nitrous oxide from nitric oxide, however, at a substantially lower rate than from nitrite when using ascorbate-reduced phenazine methosulfate as electron donor.
mesh_terms: D002462:Cell Membrane / Q000378:metabolism; D003574:Cytochrome c Group / Q000378:metabolism; D004227:Dithionite; D004579:Electron Transport; D009247:NADH, NADPH Oxidoreductases / Q000378:metabolism*; D009572:Nitrite Reductases / Q000378:metabolism*; D009573:Nitrites / Q000378:metabolism*; D009609:Nitrous Oxide; D010084:Oxidation-Reduction; D011549:Pseudomonas / Q000378:metabolism*; D013347:Subcellular Fractions / Q000378:metabolism
chemical_list: D003574:Cytochrome c Group; D009573:Nitrites; D004227:Dithionite; D009247:NADH, NADPH Oxidoreductases; D009572:Nitrite Reductases; D009609:Nitrous Oxide