The spin-correlated radical pair [P(700)(+)A(1)(-)] gives rise to a characteristic "out-of-phase" electron spin-echo signal. The electron spin-echo envelope modulation (ESEEM) of these signals has been studied in thylakoids prepared from the wild-type strain of Chlamydomonas reinhardtii and in two site-directed mutants, in which the methionine residue which acts as the axial ligand to the chlorin electron acceptor A(0) has been substituted with a histidine either on the PsaA (PsaA-M684H) or t...Expand abstract
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Bidirectional electron transfer in photosystem I: determination of two distances between P700+ and A1- in spin-correlated radical pairs.
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