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• W2084343269 abstract "The role of cytochrome b-559 in Photosystem II reactions has been investigated using hydroxylamine treatment of chloroplast membranes. Incubation of chloroplasts with hydroxylamine in darkness resulted in inhibition of water oxidation and a decrease in the amplitude of cytochrome b-559 reducible by hydroquinone. The loss of water oxidizing activity perfectly correlated with the decrease in amplitude of cytochrome b-559 reduction. Potentiometric titration of cytochrome b-559 after hydroxylamine treatment revealed a component with Em7.8 at +240 mV in addition to a lower potential species at +90 mV. This compared to control chloroplasts in which cytochrome b-559 exists in the typical high potential state, Em7.8 = +383 mV, in addition to some of the low potential (Em7.8 = +77 mV) form. Photosystem II activity could be further inhibited by incubation with hydroxylamine in the light. In these chloroplasts only low rates of photooxidation of artificial electron donors were observed compared to ‘dark’ chloroplasts. In addition, the hydroxylamine light treatment caused a further change in cytochrome b-559 redox properties; a single component, Em7.8 = 90 mV is seen in titration curves. The role of cytochrome b-559 in Photosystem II functioning is discussed on the basis of these observations which suggest a dependence of photooxidizing ability of Photosystem II on the redox properties of this cytochrome." @default.
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• W2084343269 date "1977-10-01" @default.
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• W2084343269 title "The relationship between the activity of chloroplast Photosystem II and the midpoint oxidation-reduction potential of cytochrome b-559" @default.
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• W2084343269 doi "https://doi.org/10.1016/0005-2728(77)90191-8" @default.
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