ID 1.7.3.6 DE hydroxylamine oxidase (cytochrome). AN HAO. AN hydroxylamine oxidase. AN hydroxylamine oxidoreductase. CA hydroxylamine + O2 = H(+) + H2O + nitrite. CC -!- The enzyme from the heterotrophic nitrifying bacterium Paracoccus CC denitrificans contains three to five non-heme, non-iron-sulfur iron CC atoms and interacts with cytochrome c556 and pseudoazurin. CC -!- Under anaerobic conditions in vitro only nitrous oxide is formed. CC -!- Presumably nitroxyl is released and combines with a second nitroxyl CC to give nitrous oxide and water. CC -!- When oxygen is present, nitrite is formed. CC -!- Formerly EC 1.7.3.4. //