Effect of oxidation state of plastocyanin on the remote binding site pKa

Joseph McGinnis, John D. Sinclair-Day, A. Geoffrey Sykes

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    The variation of rate constants for the [Co(phen)3]2+ [phen = 1,1 0-phenanthroline), [Co(terpy)2]2+ (terpy = 2,2′;6′,2″-terpyridine), and [Ru(NH3)5(py)]2+ (py = pyridine) reductions of parsley plastocyanin PCu(II) with pH indicate an acid dissociation pKa at the remote east face of 5.05, whereas for the oxidant [Co(phen)3]3+ with PCu(I) the value is 5.8. Implications of this change and the relevance to the reaction with cytochrome f are considered.

    Original languageEnglish
    Pages (from-to)2011-2012
    Number of pages2
    JournalJournal of the Chemical Society, Dalton Transactions
    Issue number9
    DOIs
    Publication statusPublished - 1 Jan 1986

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