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Primary Electron Transfer

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Book cover Photosystem II

Part of the book series: Advances in Photosynthesis and Respiration ((AIPH,volume 22))

Summary

This chapter reviews our current state of knowledge on the primary electron transfer in Photosystem II (PS II). Properties of chlorophyll (Chl) a in solution and the basic features of pigment-pigment and pigment-protein interactions as well as the principles underlying excitation energy transfer and electron transfer are briefly outlined. Using this description as a starting point, and based on recent information available for the spatial arrangement of the cofactors, the general features of light-induced charge separation in PS II are presented. Special attention is given to the unique properties of the photoactive pigment P680, which consists of a special multimeric pigment complex of the form (Chl a)4 (Pheo)x with x = 0, 1 or 2. The possible electronic structures of 1P680*, 3P680 and P680+• as well as the underlying features that establish the extraordinarily high oxidizing power of P680+• are discussed. Evidence is presented that in the first electron transfer event a ‘monomeric’ type Chl a within the multichromophoric P680 transfers an electron from its excited singlet state to an associated pheophytin (Pheo) a molecule which acts as the primary electron acceptor. This event is followed by rapid spin redistribution, leading to predominant localization of the electron hole on a Chl a in P680 designated as PD1, which is part of a ‘dimeric’ structural motif termed PD1PD2 and is in close proximity to the redox-active tyrosine YZ. The process leading to the formation of the radical ion pair P680+• Pheo−• comprises a cascade of radical pair states of decreasing energy through a sequence of relaxation reactions with the protein environment. The role of the protein environment in the primary charge separation process is emphasized.

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  1. Max-Volmer-Laboratorium für Biophysikalische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 135, D-10623, Berlin, Germany

    Gernot Renger

  2. Max-Planck-lnstitut für Bioanorganische Chemie, Stiftstraße 34 - 36, D-45413, Mülheim an der Ruhr, Postfach, Germany

    Alfred R. Holzwarth

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  1. Gernot Renger
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  2. Alfred R. Holzwarth
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Editors and Affiliations

  1. The Australian National University, Canberra, Australia

    Thomas J. Wydrzynski

  2. Okayama University, Okayama, Japan

    Kimiyuki Satoh

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© 2005 Springer

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Renger, G., Holzwarth, A.R. (2005). Primary Electron Transfer. In: Wydrzynski, T.J., Satoh, K., Freeman, J.A. (eds) Photosystem II. Advances in Photosynthesis and Respiration, vol 22. Springer, Dordrecht. https://doi.org/10.1007/1-4020-4254-X_8

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