Co-Authors:
Hurt, E.C., Intstitut für Botanik, Universität Regensburg, 8400 Regensburg, Germany
Hauska, G., Intstitut für Botanik, Universität Regensburg, 8400 Regensburg, Germany
Shahak, Y., Biochemistry Department, Wseizmann Institute of Science, Rehovot, 76100, Israel
Abstract:
When the cytochrome b6/f complex from chloroplasts is incorporated into liposomes, reduction of external plastocyanin by plastoquinol is stimulated under uncoupling conditions. An extra H+/e- is ejected from the vesicles during the reaction, in addition to the scalar proton liberated from plastoquinol. This is stimulated by valinomycin/K+ and abolished under uncoupling conditions. Furthermore, the formation of a membrane potential during the reaction, negative inside the vesicles, is observed with the help of carbocyanine dyes. We conclude that the cytochrome b6/f complex, like the cytochrome bc1 from mitochondria, functions as an electrogenic proton translocator. © 1982.
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