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.
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Shuvalov, V.A., Yakovlev, A.G., Vasilieva, L., Shkuropatov, A.Y. (2006). Primary Charge Separation Between P700* and the Primary Electron Acceptor Complex A-A0: A Comparison with Bacterial Reaction Centers. In: Golbeck, J.H. (eds) Photosystem I. Advances in Photosynthesis and Respiration, vol 24. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-4256-0_19
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