Abstract
To understand quantitatively the electron transfer kinetics in reaction centers (RCs) one needs to know both the spatial, three-dimensional, structure as well as the electronic structure of the reactants. The advances made in the determination of the three-dimensional structure of RCs in Rp. viridis and Rb. sphaeroides were presented earlier at this Conference by H. Deisenhofer, D. Tiede and our group. In this communication we would like to report on the results of investigations of the electronic structure of the intermediate acceptor I⨪. The acceptor, I, is believed to be a bacteriopheophytin a (Bphe a), that receives an electron from the singlet excited primary donor in ~ 4 picoseconds and passes it on to a quinone acceptor with a characteristic time of ~ 200 ps (for a review see ref. 1). In general, the charge transfer in photosynthesis is a one electron process that results in the formation of donor cation and acceptor anion radicals.
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Feher, G., Isaacson, R.A., Okamura, M.Y., Lubitz, W. (1988). ENDOR of Exchangeable Protons of the Reduced Intermediate Acceptor in Reaction Centers from Rhodobacter sphaeroides R-26. In: Breton, J., Verméglio, A. (eds) The Photosynthetic Bacterial Reaction Center. NATO ASI Series, vol 149. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-0815-5_24
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