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; //