ID   1.7.2.1
DE   Nitrite reductase (NO-forming).
AN   cd-cytochrome nitrite reductase.
AN   Cytochrome c-551:O(2), NO(2)(+) oxidoreductase.
AN   Cytochrome cd.
AN   Cytochrome cd1.
AN   Hydroxylamine (acceptor) reductase.
AN   Methyl viologen-nitrite reductase.
AN   Nitrite reductase.
AN   Nitrite reductase (cytochrome).
AN   Nitrite reductase (cytochrome; NO-forming).
AN   Pseudomonas cytochrome oxidase.
CA   Nitric oxide + H(2)O + ferricytochrome c = nitrite + ferrocytochrome c +
CA   2 H(+).
CF   Cu cation or Fe cation; FAD.
CC   -!- The reaction is catalyzed by two types of enzymes, found in the
CC       perimplasm of denitrifying bacteria.
CC   -!- One type comprises proteins containing multiple copper centers,
CC       the other a heme protein, cytochrome cd1.
CC   -!- Acceptors include c-type cytochromes such as cytochrome c-550 or
CC       cytochrome c-551 from Paracoccus denitrificans or Pseudomonas
CC       aeruginosa, and small blue copper proteins such as azurin and
CC       pseudoazurin.
CC   -!- Cytochrome cd1 also has oxidase and hydroxylamine reductase
CC       activities.
CC   -!- May also catalyze the reaction of EC 1.7.99.1 since this is a well-
CC       known activity of cytochrome cd1.
CC   -!- Formerly EC 1.6.6.5, EC 1.7.99.3 and EC 1.9.3.2.
DR   Q02219, ANIA_NEIGO ;  Q9JTB8, ANIA_NEIMA ;  Q9JYE1, ANIA_NEIMB ;
DR   Q92Z29, NIRK_RHIME ;  Q51700, NIRS_PARDP ;  P72181, NIRS_PARPN ;
DR   P24474, NIRS_PSEAE ;  P24040, NIRS_PSEST ;  P25006, NIR_ACHCY  ;
DR   P38501, NIR_ALCFA  ;  P81445, NIR_ALCXX  ;  Q53239, NIR_CERS5  ;
DR   Q06006, NIR_PSECL  ;  Q01537, NIR_RHIGA  ;  Q60214, NIR_RHISU  ;
DR   P0DV45, NRHAO_KUEST;
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