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Mechanism for photosynthetic O2 evolution.

G W Brudvig, R H Crabtree

    Proceedings of the National Academy of Sciences of the United States of America
    |July 1, 1986
    PubMed
    Summary

    Photosynthetic oxygen (O2) evolution involves a manganese complex structural change from adamantane to cubane-like forms. This mechanism, supported by EPR data, explains O2 release during photosynthesis.

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    Area of Science:

    • Biochemistry
    • Photosynthesis Research
    • Inorganic Chemistry

    Background:

    • Photosynthetic oxygen evolution is a critical process in converting light energy into chemical energy.
    • The manganese cluster is central to catalyzing this oxygen production.
    • Understanding the precise structural dynamics of the manganese cluster is key to elucidating the photosynthetic mechanism.

    Purpose of the Study:

    • To propose a detailed mechanism for photosynthetic oxygen (O2) evolution.
    • To elucidate the structural transformations of the manganese complex during the catalytic cycle.
    • To correlate spectroscopic data with proposed structural models of the manganese cluster.

    Main Methods:

    • Electron Paramagnetic Resonance (EPR) spectroscopy to probe the S2 state of the oxygen-evolving complex.
    • Analysis of manganese coordination chemistry and existing data on natural photosynthetic systems.
    • X-ray and UV spectral data interpretation.

    Main Results:

    • EPR data indicate a Mn4O4 cubane-like structure for the manganese complex in the S2 state.
    • A structural conversion from a Mn4O6 adamantane-like to a Mn4O4 cubane-like complex is proposed.
    • Proposed structures for five intermediate oxidation states of the manganese complex.

    Conclusions:

    • The proposed model effectively explains O-O bond formation and O2 release from the S4 state.
    • The structural conversion mechanism is consistent with available spectroscopic and chemical evidence.
    • This work provides a refined molecular model for the catalytic site of photosynthetic oxygen evolution.

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