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Bifurcated ubihydroquinone oxidation in the cytochrome bc1 complex by proton-gated charge transfer Brandt UFEBS Lett 1996[May]; 387 (1): 1-6The unique bifurcation of electron flow at the ubihydroquinone-oxidation center of the cytochrome bc1 complex is the energy-conserving reaction of the protonmotive Q- cycle and is prerequisite to vectorial proton translocation. The widely accepted Q-cycle reaction scheme describes the overall electron and proton pathways, but does not address the detailed chemistry of this central step. Based on a model of the ubihydroquinone-oxidation pocket containing two ubiquinone molecules in a stacked configuration, a detailed model for the reactions during steady-state catalysis is proposed. In this proton-gated charge-transfer mechanism the reaction is controlled by the deprotonation of the substrate ubihydroquinone.|Electron Transport[MESH]|Electron Transport Complex III/*chemistry/metabolism[MESH]|Models, Chemical[MESH]|Molecular Structure[MESH]|Oxidation-Reduction[MESH]|Protons[MESH] |
