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Molecular, Brownian, kinetic and stochastic models of the processes in photosynthetic membrane of green plants and microalgae

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Abstract

The paper presents the results of recent work at the Department of Biophysics of the Biological Faculty, Lomonosov Moscow State University on the kinetic and multiparticle modeling of processes in the photosynthetic membrane. The detailed kinetic models and the rule-based kinetic Monte Carlo models allow to reproduce the fluorescence induction curves and redox transformations of the photoactive pigment P700 in the time range from 100 ns to dozens of seconds and make it possible to reveal the role of individual carriers in their formation for different types of photosynthetic organisms under different illumination regimes, in the presence of inhibitors, under stress conditions. The fitting of the model curves to the experimental data quantifies the reaction rate constants that cannot be directly measured experimentally, including the non-radiative thermal relaxation reactions. We use the direct multiparticle models to explicitly describe the interactions of mobile photosynthetic carrier proteins with multienzyme complexes both in solution and in the biomembrane interior. An analysis of these models reveals the role of diffusion and electrostatic factors in the regulation of electron transport, the influence of ionic strength and pH of the cellular environment on the rate of electron transport reactions between carrier proteins. To describe the conformational intramolecular processes of formation of the final complex, in which the actual electron transfer occurs, we use the methods of molecular dynamics. The results obtained using kinetic and molecular models supplement our knowledge of the mechanisms of organization of the photosynthetic electron transport processes at the cellular and molecular levels.

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Funding

The research was carried out as part of the Scientific Project of the State Order of the Government of the Russian Federation to Lomonosov Moscow State University no. 121032500060–0 with partial support by the Russian Science Foundation (grant no. 20–64-46018, Pskov State University) and Russian Foundation for Basic Reseach (grant no. 20–04-00465).

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Conceptualization, GR and ABR; methodology, GR, NEB, TYuP, SSK and IBK; investigation, NEB, ASM, VAF, SSK, TYuP, SSK and PVF; writing—original draft preparation, GR; writing—review and editing, all authors; supervision, ABR; project administration, TKA and ABR; funding acquisition, TKA. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Galina Yu. Riznichenko.

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Riznichenko, G.Y., Antal, T.K., Belyaeva, N.E. et al. Molecular, Brownian, kinetic and stochastic models of the processes in photosynthetic membrane of green plants and microalgae. Biophys Rev 14, 985–1004 (2022). https://doi.org/10.1007/s12551-022-00988-w

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  • DOI: https://doi.org/10.1007/s12551-022-00988-w

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