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This review is focused on the mechanism of ubiquinol oxidation by the cytochrome bc 1 complex (bc 1 ). This integral membrane complex serves as a “hub” in the vast majority of electron transfer chains. The bc 1 oxidizes a ubiquinol molecule to ubiquinone by a unique “bifurcated” reaction where the two released electrons go to different acceptors: one is accepted by the mobile...
Quinones (e.g., coenzyme Q, CoQ 10 ) are best known as carriers of electrons and protons during oxidative phosphorylation and photosynthesis. A myriad of mostly more indirect physical methods, including fluorescence spectroscopy, electron-spin resonance, and nuclear magnetic resonance, has been used to localize CoQ 10 within lipid membranes. They have yielded equivocal and sometimes...
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