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Spectral and kinetic study of energy and electron transfer in the pigment protein complex of photosystem ii


, : Spectral and kinetic study of energy and electron transfer in the pigment protein complex of photosystem ii. Biologicheskie Membrany (Moscow) 5(3): 275-286

Energy migration and electron transfer processes in photosystem II (PS) reaction: centers (RC) were studied using picosecond fluorescence and absorption spectroscopy. Native chloroplasts, subchloroplast particles, enriched in PS II and RC complexes, containing about 40 chlorophyll a (Chl) molecules per photoactive primary electron donor were used. The main parameters, describing energy migration in the PS II light-harvestng antenna were determined: the diffusion coefficient D .simeq. 4 .cntdot. 103 cm2 s-1, diffusion length L .simeq. 80 .ANG. and the rate constant for energy transfer between the nearest Chl a molecules kh .simeq. 3.8 .cntdot. 1011 s-1. Energy migration in PS II core antenna appeared to be limited by excitation trapping with photoactive pigment P680. For .apprx. 100% trapping, excitation must four times visit the RC. The lifetime of the charge separation in PS II reaction centers .tau.t was 8 .+-. 3 ps, the lifetime of the electron transfer from pheophytin (Ph) molecule to Qa, .tau.Q about 210 ps. Fluorescence and absorption measurements indicated that variable nanosecond fluorescence indeed appeared from the charge recombination in the primary radical pair P680+Ph-, and its lifetime was about 3 ns. General energy diffusion parameters (D, L, .tau.fi, kh) and the lifetimes of the primary photoinduced reactions in the RC of different photosynthetic organisms were compared. A conclusion on the universality of mechanisms operating in the primary photosynthetic processes in evolutionary different organisms was made.

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