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- W1995976816 abstract "Laser flash photolysis has been used to determine the kinetics of cytochrome c reduction by chlorophyll triplet state in negatively-charged lipid bilayer vesicles, as mediated by quinones. Large synergistic enhancements in the yield of reduced cytochrome were obtained using a pair of quinones, one of which was lipophilic (e.g. benzoquinone, 2,6-di-f-butylbenzoquinone) and the other of which was hydrophilic (e.g. l,2-naphthoquinone-4-sulfonate). The mechanism was shown to involve initial quenching of the triplet by the membrane-associated quinone to form chlorophyll cation radical and quinone anion radical. An interquinone electron transfer process followed this reaction, which occurred at the membrane-water interface, and greatly facilitated electron transport from within the bilayer to the aqueous phase. This process formed the basis of the synergistic effect. Cytochrome c reduction occurred in the water phase by reaction with the anion radical of the hydrophilic quinone. Finally, the reduced cytochrome was reoxidized by a slow reaction with chlorophyll cation radical. Under the most favorable conditions, we estimate that the quantum yield of conversion of triplet quenching events to reduction of cytochrome approached unity. The lifetime of the reduced protein and oxidized chlorophyll could be as long as 140 ms, under the best conditions. This system has properties which are thus quite favorable for solar energy conversion in a biomimetic process." @default.
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- W1995976816 date "1990-05-01" @default.
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- W1995976816 title "QUINONES AS MEDIATORS OF ELECTRON TRANSFER FROM MEMBRANE-BOUND CHLOROPHYLL TO CYTOCHROME c IN THE AQUEOUS PHASE IN LIPID BILAYER VESICLES: SYNERGISTIC ENHANCEMENT OF CYTOCHROME c REDUCTION BY LIPOPHILIC/ HYDROPHILIC QUINONE PAIRS" @default.
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- W1995976816 doi "https://doi.org/10.1111/j.1751-1097.1990.tb01974.x" @default.
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