PMID: 11607457Feb 1, 1994Paper

Mechanism of electron transfer in the cytochrome b/f complex of algae: evidence for a semiquinone cycle

Proceedings of the National Academy of Sciences of the United States of America
P Joliot, A Joliot

Abstract

The most widely accepted mechanism of electron and proton transfer within the cytochrome (Cyt) b/f complex derives from the Q-cycle hypothesis originally proposed for the mitochondrial Cyt b/c1 complex by Mitchell [Mitchell, P. (1975) FEBS Lett. 57, 135-137]. In chloroplasts, the Cyt b/f complex catalyzes the oxidation of a plastoquinol at a site, Qo (the plastoquinol binding site), close to the inner aqueous phase and the reduction of a quinone at a site, Qi (the plastoquinone binding site), close to the stromal side of the membrane. In an alternative model, the semiquinone cycle [Wikström, M. & Krab, K. (1986) J. Bioenerg. Biomembr. 18, 181-193], a charged semiquinone formed at site Qo is transferred to site Qi where it is reduced into quinol. Flash-induced kinetics of the redox changes of Cyt b and of the formation of a transmembrane potential have been measured in Chlorella sorokiniana cells incubated in reducing conditions that induce a full reduction of the plastoquinone pool. The experiments were performed in the presence of an uncoupler that collapses the permanent electrochemical proton gradient and thus accelerates the rate of the electrogenic processes. The results show that the electrogenic reaction driven by the Cy...Continue Reading

References

Nov 15, 1975·FEBS Letters·P Mitchell
Oct 5, 1988·Biochimica Et Biophysica Acta·D E Robertson, P L Dutton
Aug 23, 1974·Biochimica Et Biophysica Acta·P Joliot, R Delosme
Apr 13, 1981·Biochimica Et Biophysica Acta·B Bouges-Bocquet
Jun 10, 1993·Biochimica Et Biophysica Acta·A B Hope

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Citations

Jan 22, 2010·Photosynthesis Research·F Baymann, W Nitschke
Feb 24, 2001·Bioelectrochemistry·S Berry, B Rumberg
Jun 1, 1996·Annual Review of Plant Physiology and Plant Molecular Biology·W. A. CramerJ. L. Smith
Jun 8, 2006·Annual Review of Biochemistry·William A CramerJanet L Smith
Dec 24, 2005·Proceedings of the National Academy of Sciences of the United States of America·Jiusheng YanWilliam A Cramer
Jul 19, 2013·Photosynthesis Research·Christof KlughammerUlrich Schreiber
Apr 27, 1999·Biochimica Et Biophysica Acta·F A WollmanR Nechushtai
Mar 1, 2011·Biochimica Et Biophysica Acta·William A CramerEiki Yamashita
Jun 8, 2001·The Journal of Biological Chemistry·J G Fernández-VelascoR Y Ueng
Aug 7, 1999·The Journal of Biological Chemistry·F BaymannF A Wollman
Aug 29, 1997·The Journal of Biological Chemistry·Y PierreJ L Popot
Aug 19, 2004·The Journal of Biological Chemistry·Catherine de VitryToivo Kallas
Dec 8, 1995·The Journal of Biological Chemistry·Y PierreJ L Popot
Apr 15, 2008·Biochemistry·Agnès de Lacroix de LavaletteFrancesca Zito
Oct 24, 1998·Biochimica Et Biophysica Acta·M HipplerJ D Rochaix

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