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Nitrite oxidoreductase (NOR or NXR) is an enzyme involved in nitrification. It is the last step in the process of aerobic ammonia oxidation, which is carried out by two groups of nitrifying bacteria: ammonia oxidizers such as ''Nitrosospira'', ''Nitrosomonas'' and ''Nitrosococcus'' convert ammonia to nitrite, while nitrite oxidizers such as ''Nitrobacter'' and ''Nitrospira'' oxidize nitrite to nitrate. The enzyme is bound to the inner cytoplasmic surface of the bacterial membrane and contains multiple subunits, iron-sulfur centers and a molybdenum cofactor. The enzyme is relatively abundant, making up 10-30% of the total protein in these bacteria and forms densely packed structures on the membrane surface. Reaction Nitrite + acceptor <=> nitrate + reduced acceptor ==See also== *Microbial metabolism *Ferredoxin—nitrite reductase involved in the assimilation of nitrates by plants 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「nitrite oxidoreductase」の詳細全文を読む スポンサード リンク
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