Nitric oxide reductase (menaquinol) () is an enzyme. This enzyme catalyses the following chemical reaction
2 nitric oxide + menaquinol nitrous oxide + menaquinone + H2O
Nitric oxide reductase contains copper.
In 2015 the laboratory that had characterized the Bacillus azotoformans enzyme wrote, "The copper-A-dependent Nor from Bacillus azotoformans uses cytochrome c551 as electron donor but lacks menaquinol activity, in contrast to our earlier report."
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