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  • Title: Redox state of peroxy and ferryl intermediates in cytochrome c oxidase catalysis.
    Author: Fabian M, Palmer G.
    Journal: Biochemistry; 1999 May 11; 38(19):6270-5. PubMed ID: 10320356.
    Abstract:
    The redox states of the "peroxy" (P) and "ferryl" (F) intermediates formed during reoxidation of reduced bovine cytochrome c oxidase have been probed by reduction with both ferrocytochrome c and acetylpyridine NADH under anaerobic conditions using optical spectroscopy. The reduction of the P and F forms revealed that both are in very similar redox states. One-electron reduction of either the P or F form yields an optical spectrum primarily due to oxidized enzyme implying that the heme iron of cytochrome a3 is in the ferryl state in both forms. The F and P forms were found to be 1 and less than 1.3 oxidizing equiv, respectively, above the oxidized enzyme. The slightly higher oxidation state in the P form is interpreted as being due to an optically undetectable redox center presumably located in the binuclear cavity.
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