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Information on EC - hydroxylamine oxidase (cytochrome)

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IUBMB Comments
The enzyme from the heterotrophic nitrifying bacterium Paracoccus denitrificans contains three to five non-heme, non-iron-sulfur iron atoms and interacts with cytochrome c556 and pseudoazurin [2,3]. Under anaerobic conditions in vitro only nitrous oxide is formed . Presumably nitroxyl is released and combines with a second nitroxyl to give nitrous oxide and water. When oxygen is present, nitrite is formed.
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The enzyme appears in viruses and cellular organisms
Reaction Schemes
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HAO, hydroxylamine oxidase, hydroxylamine oxidoreductase, hydroxylamine-cytochrome c oxidoreductase, hydroxylamine-cytochrome c reductase, oxidase, hydroxylamine HAO, protein NE1300, more
hydroxylamine + 2 ferricytochrome c = nitroxyl + 2 ferrocytochrome c + 2 H+
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hydroxylamine + O2 = nitrite + H2O + H+
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overall reaction
nitroxyl + 2 ferrocytochrome c + O2 + H+ = nitrite + 2 ferricytochrome c + H2O
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