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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)

Abstract

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.

Keywords

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