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ENZYME entry: EC

Accepted Name
Nitrite reductase (NO-forming).
Alternative Name(s)
cd-cytochrome nitrite reductase.
Cytochrome c-551:O(2), NO(2)(+) oxidoreductase.
Cytochrome cd.
Cytochrome cd1.
Hydroxylamine (acceptor) reductase.
Methyl viologen-nitrite reductase.
Nitrite reductase.
Nitrite reductase (cytochrome).
Nitrite reductase (cytochrome; NO-forming).
Pseudomonas cytochrome oxidase.
Reaction catalysed
Nitric oxide + H(2)O + ferricytochrome c <=> nitrite + ferrocytochrome c + 2 H(+)
Cu cation or Fe cation; FAD.
  • The reaction is catalyzed by two types of enzymes, found in the perimplasm of denitrifying bacteria.
  • One type comprises proteins containing multiple copper centers, the other a heme protein, cytochrome cd1.
  • Acceptors include c-type cytochromes such as cytochrome c-550 or cytochrome c-551 from Paracoccus denitrificans or Pseudomonas aeruginosa, and small blue copper proteins such as azurin and pseudoazurin.
  • Cytochrome cd1 also has oxidase and hydroxylamine reductase activities.
  • May also catalyze the reaction of EC since this is a well- known activity of cytochrome cd1.
  • Formerly EC, EC and EC
PRIAM enzyme-specific profiles1.7.2.1
KEGG Ligand Database for Enzyme Nomenclature1.7.2.1
IUBMB Enzyme Nomenclature1.7.2.1
MEDLINEFind literature relating to
Q92Z29, NIRK_RHIME;  Q51700, NIRS_PARDP;  P72181, NIRS_PARPN;  
P24474, NIRS_PSEAE;  P24040, NIRS_PSEST;  P25006, NIR_ACHCY;  
P38501, NIR_ALCFA;  P81445, NIR_ALCXX;  Q06006, NIR_PSECL;  
Q01537, NIR_RHIGA;  Q60214, NIR_RHISU;  Q53239, NIR_RHOS5;  

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