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

  • Pierre Moenne-Loccoz
  • Bruno Robert
  • Marc Lutz


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).


Triplet State Difference Spectrum Resonance Raman Resonance Raman Spectrum Primary Electron Donor 
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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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