KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
additional information | - |
additional information | kinetics, both reaction steps show first-order dependence on nitric oxide | Nitrosomonas europaea |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
hydroxylamine + NH3 + cytochrome c-554 | Nitrosomonas europaea | the ammonia-oxidizing bacterium Nitrosomonas europaea normally catalyzes the four-electron oxidation of hydroxylamine to nitrite, which is the second step in ammonia-dependent respiration. In the presence of methyl viologen monocation radical, HAO can catalyze the reduction of nitric oxide to ammonia, reaction of by cytochrome c nitrite reductase , EC 1.7.2.2, overview | NO2 + H2O + reduced cytochrome c-554 | - |
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Organism | UniProt | Comment | Textmining |
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Nitrosomonas europaea | - |
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Reaction | Comment | Organism | Reaction ID |
---|---|---|---|
hydroxylamine + NH3 + acceptor = N2 + H2O + reduced acceptor | catalytic mechanism, overview | Nitrosomonas europaea |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
hydroxylamine + NH3 + cytochrome c-554 | - |
Nitrosomonas europaea | NO2 + H2O + reduced cytochrome c-554 | - |
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hydroxylamine + NH3 + cytochrome c-554 | the ammonia-oxidizing bacterium Nitrosomonas europaea normally catalyzes the four-electron oxidation of hydroxylamine to nitrite, which is the second step in ammonia-dependent respiration. In the presence of methyl viologen monocation radical, HAO can catalyze the reduction of nitric oxide to ammonia, reaction of by cytochrome c nitrite reductase , EC 1.7.2.2, overview | Nitrosomonas europaea | NO2 + H2O + reduced cytochrome c-554 | - |
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additional information | the enzyme catalyzes the four-electron oxidation of NH2OH to nitrite under aerobic conditions, HAO reacts with NO radical and NH2OH under reducing conditions | Nitrosomonas europaea | ? | - |
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Subunits | Comment | Organism |
---|---|---|
More | arrangement of the eight hemes within one subunit of hydroxylamine oxidoreductase, structure, overview | Nitrosomonas europaea |
Synonyms | Comment | Organism |
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HAO | - |
Nitrosomonas europaea |
hydroxylamine oxidoreductase | - |
Nitrosomonas europaea |
Cofactor | Comment | Organism | Structure |
---|---|---|---|
cytochrome c554 | a soluble 26.1-kDa tetraheme protein that is quite abundant in the periplasm of Nitrosomas europaea and is the acceptor of the electrons from HAO in vivo | Nitrosomonas europaea | |
cytochrome P460 | heme-containing cofactor, overview | Nitrosomonas europaea | |
heme | several, structure and organization, overview | Nitrosomonas europaea |