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Current perceptions of Photosystem II

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Abstract

In the last few years our knowledge of the structure and function of Photosystem II in oxygen-evolving organisms has increased significantly. The biochemical isolation and characterization of essential protein components and the comparative analysis from purple photosynthetic bacteria (Deisenhofer, Epp, Miki, Huber and Michel (1984) J Mol Biol 180: 385–398) have led to a more concise picture of Photosystem II organization. Thus, it is now generally accepted that the so-called D1 and D2 intrinsic proteins bind the primary reactants and the reducing-side components. Simultaneously, the nature and reaction kinetics of the major electron transfer components have been further clarified. For example, the radicals giving rise to the different forms of EPR Signal II have recently been assigned to oxidized tyrosine residues on the D1 and D2 proteins, while the so-called Q400 component has been assigned to the ferric form of the acceptor-side iron. The primary charge-separation has been meaured to take place in about 3 ps. However, despite all recent major efforts, the location of the manganese ions and the water-oxidation mechanism still remain largely unknown. Other topics which lately have received much attention include the organization of Photosystem II in the thylakoid membrane and the role of lipids and ionic cofactors like bicarbonate, calcium and chloride. This article attempts to give an overall update in this rapidly expanding field.

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  1. Department of Biochemistry and Biophysics, Chalmers University of Technology, S-412 96, Göteborg, Sweden

    Örjan Hansson

  2. Department of Biochemistry and Biophysics, University of Göteborg, S-412 96, Göteborg, Sweden

    Örjan Hansson & Tom Wydrzynski

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Hansson, Ö., Wydrzynski, T. Current perceptions of Photosystem II. Photosynth Res 23, 131–162 (1990). https://doi.org/10.1007/BF00035006

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