Structure of the Primary Reactants in Photosystem II : Resonance Raman Studies of D1D2 Particles

  • Pierre Moenne-Loccoz
  • Bruno Robert
  • Marc Lutz

Abstract

Photosystem II reaction centers (RC) consist of D1 and D2 polypeptides and a bound cytochrome b 559. Isolated RC, named D1/D2 particles, contain 4–6 Chl a, 1 β-carotene and 1 or 2 cytochrome b 559 per two pheophytin a molecules (1). Polypeptides D1 and D2 exhibit marked homologies with the L and M subunits of the RC of purple bacteria, respectively (2). PS II shares a number of functional similarities with bacterial RCs. In these particles, absorption of a photon results in a rapid charge separation between the primary electron donor, P680, and a Pheo molecule; because of the lack of a secondary electron acceptor, relaxation of the D1/D2 reaction centers occurs through the formation of a 900 µs-lived triplet state involving Chl a molecule(s), named PR (3).

Keywords

Triplet State Difference Spectrum Resonance Raman Resonance Raman Spectrum Primary Electron Donor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • Pierre Moenne-Loccoz
    • 1
  • Bruno Robert
    • 1
  • Marc Lutz
    • 1
  1. 1.Service de Biophysique, Département de BiologieCEN SaclayGif/YvetteFrance

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