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Information on EC 1.7.2.6 - hydroxylamine dehydrogenase

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IUBMB Comments
The enzymes from the nitrifying bacterium Nitrosomonas europaea [1,4] and the methylotrophic bacterium Methylococcus capsulatus are hemoproteins with seven c-type hemes and one specialized P-460-type heme per subunit. The enzyme converts hydroxylamine to nitrite via an enzyme-bound nitroxyl intermediate . While nitrite is the main product, the enzyme from Nitrosomonas europaea can produce nitric oxide as well .
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The expected taxonomic range for this enzyme is: Bacteria
Synonyms
HAO, haoA, HCR, HOA, hydroxylamine cytochrome c554 oxidoreductase, hydroxylamine oxidase, hydroxylamine oxidoreductase, hydroxylamine-cytochrome c reductase, hydroxylamine:oxygen oxidoreductase, NeHAO, more
REACTION
REACTION DIAGRAM
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ORGANISM
UNIPROT
LITERATURE
hydroxylamine + 3 ferricytochrome c = nitric oxide + 3 ferrocytochrome c + 3 H+
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(2)
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hydroxylamine + H2O + 4 ferricytochrome c = nitrite + 4 ferrocytochrome c + 5 H+
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(1)
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