Where Plants Make Oxygen: a Structural Model for the Photosynthetic Oxygen-Evolving Manganese Cluster

DOI Web Site 被引用文献30件
  • Vittal K. Yachandra
    Structural Biology Division, Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720.
  • Victoria J. DeRose
    Structural Biology Division, Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720.
  • Matthew J. Latimer
    Structural Biology Division, Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720.
  • Ishita Mukerji
    Structural Biology Division, Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720.
  • Kenneth Sauer
    Structural Biology Division, Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720.
  • Melvin P. Klein
    Structural Biology Division, Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720.

抄録

<jats:p>In the photosynthetic evolution of oxygen, water oxidation occurs at a catalytic site that includes four manganese atoms together with the essential cofactors, the calcium and chlorine ions. A structural model and a determination of the manganese oxidation states based on x-ray absorption spectroscopy are presented. The salient features, in both higher plants and cyanobacteria, are a pair of di-μ-oxo bridged manganese binuclear clusters linked by a mono-μ-oxo bridge, one proximal calcium atom, and one halide. In dark-adapted samples, manganese occurs in oxidation states (III) and (IV). Data from oriented membranes display distinct dichroism, precluding highly symmetrical structures for the manganese complex.</jats:p>

収録刊行物

  • Science

    Science 260 (5108), 675-679, 1993-04-30

    American Association for the Advancement of Science (AAAS)

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