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Bovine heart cytochrome-c oxidase was reconstituted in liposomes and modified with N-ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline (EEDQ). EEDQ reacted mainly with subunits II and III and to a lower extent with subunit I, as shown by difference labeling with [14C]dicyclohexylcarbodiimide. EEDQ treatment of cytochrome-c oxidase vesicles influenced ferrocytochrome c-induced proton pumping by reducing maximally the H+/e- stoichiometry from 0.84 (control) to 0.24, but had only small effects onpmid:1850736 fatcat:reakb5r6tjachhdwq7o3em3nfm