Photosystem I pp 291-300 | Cite as

Primary Charge Separation Between P700* and the Primary Electron Acceptor Complex A-A0: A Comparison with Bacterial Reaction Centers

  • Vladimir A. Shuvalov
  • Andrei G. Yakovlev
  • L. G. Vasilieva
  • Anatoly Ya. Shkuropatov
Part of the Advances in Photosynthesis and Respiration book series (AIPH, volume 24)


The mechanism of charge separation and the stabilization of separated charges in photosystem I (PS I) is considered in comparison with reaction centers (RCs) in bacteria. The analysis of the X-ray crystal structures of the RCs together with psec and fsec studies of charge separation coupled to nuclear motion in the system provides new insight into the problem. A psec study of PS I RCs has shown that the primary charge separation takes place between P700*. and the A-A0 complex. The three-dimensional structure of both the primary electron donor and acceptor shows a possible pathway for electron transfer between P700 and the A-A0 complex that is governed by nuclear motions. A fsec study of a coherent formation of the nuclear wavepacket on the potential energy surface of the excited state of the primary electron donor P* and of the charge separated state P+A (where A is the primary electron acceptor) in native, pheophytin-modified and mutant reaction centers of Rhodobacter spaeroides was compared with X-ray and psec data for PS I RCs. A mechanism of the charge separation and stabilization of separated charges in PS I RCs is proposed.


Charge Separation Rhodobacter Sphaeroides Nuclear Motion Primary Electron Donor Primary Charge Separation 
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Copyright information

© Springer 2006

Authors and Affiliations

  • Vladimir A. Shuvalov
    • 1
  • Andrei G. Yakovlev
    • 1
  • L. G. Vasilieva
    • 2
  • Anatoly Ya. Shkuropatov
    • 2
  1. 1.Laboratory of PhotobiophysicsBelozersky Institute of Chemical and Physical Biology of Moscow State UniversityMoscowRussia
  2. 2.Institute of Basic Biological ProblemsRussian Academy of SciencesMoscow RegionRussia

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