Ubiquinol oxidase (H+-transporting) (EC 7.1.1.3, cytochrome bb3 oxidase, cytochrome bo oxidase, cytochrome bd-I oxidase) is an enzyme with systematic name ubiquinol:O2 oxidoreductase (H+-transporting).
[1][2][3][4] This enzyme catalyses the following chemical reaction Ubiquinol oxidase contains a dinuclear centre comprising two hemes, or heme and copper.