A kinetic model of the cytochrome bf complex. Evaluation of kinetic parameters

A kinetic model of the cytochrome bf complex was developed on the assumption that the Q-cycle operates. The bf complex was considered as a membrane enzyme catalyzing the electron transfer from plastoquinol to plastocyanine, which is coupled with proton translocation from the chloroplast stroma to th...

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Bibliographic Details
Published in:	Biofizika Vol. 49; no. 6; p. 1061
Main Authors:	Kamali, M Jamal, Lebedeva, G V, Demin, O V, Beliaeva, N E, Riznichenko, G Iu, Rubin, A B
Format:	Journal Article
Language:	Russian
Published:	Russia (Federation) 01-11-2004
Subjects:	Cytochrome b6f Complex - chemistry Electron Transport Kinetics Membrane Potentials Models, Biological Oxidation-Reduction Plastocyanin - chemistry Plastoquinone - analogs & derivatives Plastoquinone - chemistry Proton Pumps - chemistry Thylakoids - chemistry
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Summary:	A kinetic model of the cytochrome bf complex was developed on the assumption that the Q-cycle operates. The bf complex was considered as a membrane enzyme catalyzing the electron transfer from plastoquinol to plastocyanine, which is coupled with proton translocation from the chloroplast stroma to the thylakoid lumen. The dependence of the electron transfer rates on the value of the transmembrane electric potential was taken into account. The model was applied to describe the experimental data on the flash-induced turnover of cytochromes b, plastocyanine, and the kinetics of proton deposition in the thylakoid lumen. The estimation of model parameters was performed.
ISSN:	0006-3029