A relationship between the midpoint potential of the primary acceptor and low temperature photochemistry in photosystem II

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Abstract

Redox titrations of the photo-induced pheophytin EPR signal in Photosystem II show two transitions which reflect the redox state of Q. The high potential wave (Em {reversed tilde equals} -50 mV) can be photo-induced at 5 K and 77 K. The low potential wave (Em {reversed tilde equals} -275 mV) required illumination at 200 K. This indicates the presence of two kinds of PS-II reaction centres differing in terms of the competence of their donors at low temperature and the Em-values of their acceptors. Measurements of the semiquinone-iron acceptor also demonstrate functional heterogeneity at low temperature. This is the first observation of the semiquinone-iron acceptor in a non-mutant species. © 1983.

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Rutherford, A. W., & Mathis, P. (1983). A relationship between the midpoint potential of the primary acceptor and low temperature photochemistry in photosystem II. FEBS Letters, 154(2), 328–334. https://doi.org/10.1016/0014-5793(83)80176-8

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