Abstract
Addition of cyanide to the CO complex of cytochrome oxidase reduces the apparent photosensitivity of the Fe–CO bond. This effect is not seen with azide, or when cyanide is added to ferromyoglobin‐CO. It is proposed that cyanide binds to CuB, and restricts the passage of CO out of the protein. This restriction favors geminate recombination of CO and ferrocytochrome a 3, thereby lowering the apparent quantum yield for CO photolysis. The apparent K d of cyanide for CuB is 15.4 mM. These data support a direct role for CuB in ligand binding by cytochrome c oxidase.