Are the trapping dynamics in Photosystem II sensitive to QA redox potential?

L. Barter, M. Schilstra, J. Barber, J.R. Durrant, D.R. Klug

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Removal of the manganese complex from photosystem II (PSII) causes a 145 meV shift in the redox potential of the plastoquinone QA [Biochim. Biophys. Acta 1229 (1995) 193; Photosynthetica 27 (1–2) (1992) 89; Biochim. Biophys. Acta 1229 (1995) 202]. Time resolved single photon counting has been used to monitor the time dependent concentrations of the singlet states in intact and manganese depleted BBY-type core particles studied with QA in a fully open state. Surprisingly, no difference is observed between the experimental results obtained from the intact and manganese depleted samples. We demonstrate that this could be indicative of a very deep primary radical pair trap formed in PSII core particles with QA in a fully open state. Alternatively, static inhomogeneity or a possible time-dependence of the QA redox potential via relaxations such as proton motions should be considered.
Original languageEnglish
Pages (from-to)127-132
JournalJournal of Photochemistry and Photobiology A: Chemistry
Issue number2-3
Publication statusPublished - 2001


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