Electron transport and transmembrane proton transfer in photosynthetic systems of oxygenic type in Silico
Tóm tắt
Using a mathematical model of light-induced stages of photosynthesis, which takes into account the key stages of pH-dependent regulation on the acceptor and donor sides of PS I, we analyzed electron and proton transport in chloroplasts of higher plants and in cyanobacterial cells. A comparison of computer simulations with experimental data showed that our model adequately described the complex nonmonotonic kinetics of the light-induced redox transients of P700. Effects of atmospheric gases (CO2 and O2) on the kinetics of photooxidation of P700 and generation of the transmembrane pH difference were studied. We also analyzed how cyclic electron transport influenced the kinetics of electron transfer, intrathylakoid pH, and ATP production. Within the framework of our model, we described the time courses of electron flow through PS II and distribution of electron fluxes on the acceptor side of PS I in chloroplasts and in cyanobacteria. It was demonstrated that contributions of cyclic electron transport and electron flow to O2 (the Mehler reaction) were significant during the initial phase of the induction period, but diminished upon activation of the Calvin-Benson cycle.
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