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Photoreduction of cytochrome b 6 and photooxidation of cytochrome f can be observed with an isolated cytochrome b 6 /f complex linked to photosystem I reaction centers via plastocyanin, in the presence of plastoquinol-1. Reduction of cytochrome b 6 and simultaneous oxidation of cytochrome f can also be demonstrated by addition of ferricyanide to the complex plus plastoquinol-1. Reduction of cytochrome b 6 , but not oxidation of cytochrome f, is dependent on the presence of the Rieske Fe-S protein, as revealed by inhibition with a specific antibody or by removal of the Fe-S protein. The dependence of cytochrome f reduction by plastoquinol-1 on the Rieske Fe-S center is also shown.
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Hurt et al. (1982) studied this question.
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