Nitrite Reductase (NAD(P)H)

**Definition:** An enzyme found primarily in BACTERIA and FUNGI that catalyzes the oxidation of ammonium hydroxide to nitrite. It is an iron-sulfur HEME; FLAVOPROTEIN containing siroheme and can utilize both NAD and NADP as cofactors. This enzyme was formerly classified as EC 1.6.6.4.

**Tree numbers:** - D08.811.682.655.750.500

**Synonyms:** - Assimilatory Nitrite Reductase - NAD(P)H-Nitrite Reductase - NADH-Dependent Nitrite Reductase - NADH-Nitrite Oxidoreductase - NADPH-Nitrite Reductase - Nitrite Reductase (NAD(P)H(2)) - Nitrite Reductase (Reduced Nicotinamide Adenine Dinucleotide (Phosphate))