Hydroxylamine dehydrogenase

Hydroxylamine dehydrogenase (, HAO (ambiguous)) is an enzyme with systematic name hydroxylamine:ferricytochrome-c oxidoreductase. This enzyme catalyses the following chemical reaction


 * (1) hydroxylamine + H2O + 2 ferricytochrome c $$\rightleftharpoons$$ nitrite + 2 ferrocytochrome c + 5 H+
 * (2) hydroxylamine + ferricytochrome c $$\rightleftharpoons$$ nitric oxide + ferrocytochrome c + 3 H+

The enzymes from the nitrifying bacterium Nitrosomonas europaea and the methylotrophic bacterium Methylococcus capsulatus are hemoproteins.