The available experimental data on the electron donor (D)−acceptor (A) coupling ( H DA ) for electron-transfer (ET) reactions in proteins are re-examined. In spite of their structural and energetic similarities, the photosynthetic reaction center and other ET protein systems exhibit a marked difference of the exponential decay of H DA with the distance separating D and A. A numerical study shows that this difference is explained in terms of very small variations of the energetics between these two classes of proteins.
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Lopez-Castillo et al. (1997) studied this question.
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