Modeling Electron and Proton Transport in Chloroplasts
Alexander N. Tikhonov
from: Chloroplasts: Current Research and Future Trends (Edited by: Helmut Kirchhoff). Caister Academic Press, U.K. (2016) Pages: 101-134.
Mathematical modeling of photosynthesis provides a framework for in-depth analysis of light energy transduction and feedbacks in the network of plant cell metabolism. In this Chapter, mathematical models of oxygenic photosynthesis are considered in the context of light-induced regulation of photosynthetic electron and proton transport in chloroplasts, the energy transducing organelles of the plant cell. After a brief overview of electron and proton transport processes in chloroplasts and basic mechanisms of their regulation, general approaches to mathematical description of photosynthetic processes are outlined. As an example of computer modeling of oxygenic photosynthesis, a generalized mathematical model of electron and proton transport in chloroplasts is described. The model includes key stages of linear electron transport, alternative pathways of electron transfer around Photosystem I, transmembrane proton transport and ATP synthesis. The model also takes into account pH-dependent mechanisms of the intersystem electron transport control and the light-induced activation of the Calvin-Benson cycle. Some peculiarities of diffusion-controlled reactions of electron and proton transport in chloroplasts are described within the framework of the model which takes into account lateral heterogeneity of thylakoid membranes. At the end of the Chapter, future trends in modeling electron and proton transport in chloroplasts are analyzed read more ...