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- W2288101448 abstract "Abstract Photosystem I fragments were prepared by digitonin treatment of spinach chloroplasts. The midpoint potential of cytochrome b 6 in the fragments is close to 0 V, showing a one electron transition. No cytochrome b 559 was detectable, neither in difference absorption spectra nor in light-induced absorbance changes. In the absence of added cofactors only cytochrome b 6 photoreduction can be observed. This photoreduction is stimulated by ferredoxin. Ferredoxin-NADP + reductase appears not to be involved in cytochrome b6 reduction. Photooxidation of cytochrome b 6 is dependent on plastocyanin addition and inhibited by DBMIB, a plastoquinone antagonist. Addition of plastocyanin restores cytochrome f photooxidation as well, reacting quite specifically in about equimolar concentrations to bound cytochrome f. The stimulation of cytochrome f oxidation is abolished by an antibody prepared against plastocyanin, indicating a surface location of plastocyanin in digitonin treated membranes. Biphasic kinetics of dark-reduction of cytochrome f by ascorbate indicate that part of this cytochrome f is relatively inaccessible in the membrane. After preillumination a monophasic reduction is observed and the slowly oxidized component is absent. Illumination in the presence of plastocyanin causes a fast and complete reduction of cytochrome f, suggesting equilibration of cytochrome f with added plastocyanin, residing in the membrane surface. It appears that actinic light causes conformation and/or structural changes in the membrane of these digitonin fragments, influencing cytochrome f accessibility." @default.
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- W2288101448 date "1976-02-01" @default.
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- W2288101448 title "Photoreactions of Cytochrome b<sub>6</sub> and Cytochrome f in Chloroplast Photosystem I Fragments" @default.
- W2288101448 doi "https://doi.org/10.1515/znc-1976-1-215" @default.
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