Abstract
The reorganization energies of the medium and the activation energies of electron transfer in the photosynthetic reaction centre have been calculated (the geometric parameters are assumed in accordance with the X-ray crystallographic analysis data for Rhodopseudomonas viridis ). Due to the low reorganization energy of the protein medium and the optimum relations of the effective dimensions of reagents, for each step of the main electron transfer path, the corresponding reorganization energy and the free energy of reaction (difference of redox potentials) are similar. As a result, the activation energy of each of these electron transfer steps is negligible. The electron back-transfer from the primary acceptor to the primary donor, though strongly advantageous thermodynamically, is hindered by high activation energy.
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Schedule a callMore From: Biochimica et Biophysica Acta (BBA) - Bioenergetics
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