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  • Title: The effect of o-phenanthroline on the midpoint potential of the primary electron acceptor of photosystem II.
    Author: Knaff DB.
    Journal: Biochim Biophys Acta; 1975 Mar 20; 376(3):583-7. PubMed ID: 235986.
    Abstract:
    The primary electron acceptor of Photosystem II has a midpoint oxidation-reduction potential of +95 mV at pH 7.0 in Photosystem II chloroplast fragments prepared by digitonin treatment. The midpoint potential of the acceptor has a pH dependence of -60 mV/pH unit. At concentrations that inhibit oxygen evolution, o-phenanthroline shifts the midpoint potential of the primary acceptor by +70 mV. The shifted potential retains the same dependence on pH. The effect of o-phenanthroline suggests that it interacts directly with the primary electron acceptor of photosystem II in a manner similar to that reported previously for the primary electron acceptor in purple photosynthetic bacteria.
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