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• W2075693886 abstract "The ferrous ion associated with the electron acceptors in Photosystem II can be oxidized by the unstable semiquinone form of certain high-potential quinones (phenyl-p-benzoquinone, dimethylbenzoquinone and benzoquinone) which are used as electron acceptors. In a flash sequence, alternating oxidation of the iron by the photoreduced semiquinone on odd-numbered flashes is followed by photoreduction of the iron on even-numbered flashes. These reactions are detected by monitoring EPR signals arising from Fe3+. The oxidation of the iron can also occur in the frozen state (−30°C) indicating that the high-potential quinone can occupy the QB site. The reaction also takes place when the exogenous quinone is added in the dark to samples in which QB is already in the semiquinone form. The inhibitors of electron transfer between QA− and QB, DCMU and sodium formate, block the photoreductant-induced iron oxidation. It is suggested that the iron oxidation takes place through the QB site. This unexpected photochemistry occurs under experimental conditions routinely used in studies of Photosystem II. Some previously reported phenomena can be reinterpreted on the basis of these new data." @default.
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• W2075693886 date "1986-10-01" @default.
• W2075693886 modified "2023-10-16" @default.
• W2075693886 title "Photoreductant-induced oxidation of Fe2+ in the electron-acceptor complex of Photosystem II" @default.
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• W2075693886 doi "https://doi.org/10.1016/0005-2728(86)90078-2" @default.
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