ID 1.7.2.9 DE hydroxylamine oxidase. AN HOX. AN HOX2. CA hydroxylamine + 3 Fe(III)-[cytochrome c] = nitric oxide + 3 Fe(II)- CA [cytochrome c] + 3 H(+). CC -!- The enzyme, characterized from the anaerobic ammonium-oxidizing CC (anammox) bacterium Kuenenia stuttgartiensis, is very similar to CC EC 1.7.2.6. CC -!- Both enzymes are homotrimeric enzymes in which each subunit contains CC seven c-type hemes and one specialized P460-type heme that is bound CC to a tyrosine residue in an adjacent subunit. CC -!- However, this enzyme catalyzes only the 3 electron oxidation of CC hydroxylamine, forming nitric oxide, and is not capable of performing CC further oxidation to form nitrite. DR Q1PX48, HAO_KUEST ; Q50925, HAO_NITEU ; //