Nitrate reductase (quinone) (, nitrate reductase A, nitrate reductase Z, quinol/nitrate oxidoreductase, quinol-nitrate oxidoreductase, quinol:nitrate oxidoreductase, NarA, NarZ, NarGHI) is an enzyme with systematic name nitrite:quinone oxidoreductase. This enzyme catalyses the following chemical reaction
nitrate + a quinol nitrite + a quinone + H2O
This is a membrane-bound enzyme which supports [anaerobic respiration] on nitrate.
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