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- W1970414842 abstract "A low-temperature electron paramagnetic resonance (EPR) signal in spinach chloroplasts has been identified as originating from oxidized bound plastocyanin. The EPR parameters of the bound plastocyanin, which are the same as those of soluble plastocyanin, are: g⊥ = 2.05, g∥ = 2.23, and A∥ = 0.006 cm−1. An estimation of the amount of bound plastocyanin based on the in situ EPR signal indicates a concentration of approximately 3 nmoles per mg chlorophyll, a value which agrees with the amount of plastocyanin determined by chemical assay after release from the chloroplast lamellae by sonication. Light-induced changes of plastocyanin in situ have been examined after illumination with monochromatic light at physiological temperatures. The bound plastocyanin undergoes a photoreduction in Photosystem II light which is sensitive to inhibitors of noncyclic electron transport. The presence of the NADP+ acceptor system in Photosystem II light causes a shift in the steady-state level of plastocyanin providing direct evidence for the role of plastocyanin in noncyclic electron transport from water to NADP+. Phosphorylation cofactors and the uncoupler, NH4Cl, also cause shifts in the plastocyanin steady-state level in red light. Photosystem I light is able to photooxidize reduced plastocyanin, while Photosystem II light is only capable of photooxidation in the presence of inhibitors of the photoreduction. These results of studies on plastocyanin photoreactions in situ are discussed in terms of different proposed roles for plastocyanin in the chloroplast noncyclic electron transport chain." @default.
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- W1970414842 date "1973-01-01" @default.
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- W1970414842 title "Light-induced changes of bound chloroplast plastocyanin as studied by EPR spectroscopy: The role of plastocyanin in noncyclic photosynthetic electron transport" @default.
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- W1970414842 doi "https://doi.org/10.1016/0005-2728(73)90261-2" @default.
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