The Cytochrome b 6 f Complex: Biophysical Aspects of Its Functioning in Chloroplasts

Sub-cellular Biochemistry
Alexander N Tikhonov

Abstract

This chapter presents an overview of structural properties of the cytochrome (Cyt) b 6 f complex and its functioning in chloroplasts. The Cyt b 6 f complex stands at the crossroad of photosynthetic electron transport pathways, providing connectivity between Photosystem (PSI) and Photosysten II (PSII) and pumping protons across the membrane into the thylakoid lumen. After a brief review of the chloroplast electron transport chain, the consideration is focused on the structural organization of the Cyt b 6 f complex and its interaction with plastoquinol (PQH2, reduced form of plastoquinone), a mediator of electron transfer from PSII to the Cyt b 6 f complex. The processes of PQH2 oxidation by the Cyt b 6 f complex have been considered within the framework of the Mitchell's Q-cycle. The overall rate of the intersystem electron transport is determined by PQH2 turnover at the quinone-binding site Qo of the Cyt b 6 f complex. The rate of PQH2 oxidation is controlled by the intrathylakoid pHin, which value determines the protonation/deprotonation events in the Qo-center. Two other regulatory mechanisms associated with the Cyt b 6 f complex are briefly overviewed: (i) redistribution of electron fluxes between alternative (linear and cyc...Continue Reading

Citations

Aug 12, 2020·Photosynthesis Research·Alexander N Tikhonov, Alexey V Vershubskii
Mar 12, 2021·Biochemistry. Biokhimii︠a︡·Alexey V Vershubskii, Alexander N Tikhonov
Nov 16, 2021·Journal of Plant Research·Riu FurutaniChikahiro Miyake

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