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Structure And Function Of Cytochrome Bc Complexes

Edward A. Berry, Mariana Guergova-Kuras, Li-shar Huang, Antony R. Crofts

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▪ Abstract  The cytochrome bc complexes represent a phylogenetically diverse group of complexes of electron-transferring membrane proteins, most familiarly represented by the mitochondrial and bacterial bc 1 complexes and the chloroplast and cyanobacterial b 6 f complex. All these complexes couple electron transfer to proton translocation across a closed lipid bilayer membrane, conserving the free energy released by the oxidation-reduction process in the form of an electrochemical proton gradient across the membrane. Recent exciting developments include the application of site-directed mutagenesis to define the role of conserved residues, and the emergence over the past five years of X-ray structures for several mitochondrial complexes, and for two important domains of the b 6 f complex.