Conception of hystons in bacterial photosynthesis: spectra, exciton dynamics, and electron transfer

Vladimir S. Pavlovich

doi:10.1117/12.752399

9 July 2007 Conception of hystons in bacterial photosynthesis: spectra, exciton dynamics, and electron transfer

Vladimir S. Pavlovich

Proceedings Volume 6727, ICONO 2007: Nonlinear Laser Spectroscopy and High-Precision Measurements; and Fundamentals of Laser Chemistry and Biophotonics; 67271T (2007) https://doi.org/10.1117/12.752399
Event: The International Conference on Coherent and Nonlinear Optics, 2007, Minsk, Belarus

Abstract

It has been shown that among the great diversity of available vibrational modes there are two types so called h_μ- and h_α- hyston modes in the light-harvesting (LH) antennas and in the complexes of the reaction centers (RCs), which produce high modulated broadening of excitonic spectra with radically different temperature behavior. At the same time the h_μ- and h_α-modes initiate different activationless electron transfer (ET) processes in the RCs. Novel formulas is presented, which making it possible to describe known experimental data on the half-width of the B800, B850 absorption for LH2 antennas and the P870 and P960 absorption for RCs as well as on the temperature effect on the ET rate. The primary ET is considered as a resonant nonradiative transition between P* and P⁺B_A- states with next stabilization (P is a special pair, B_A is an accessory bacteriochlorophyll in A-branch of RC). It has been shown that the h_α-mode with own frequency in the range of 130-150 cm^-1 controls the primary ET from P* to bacteriopheophytin (H_A).The ET matrix elements are of 12.7 ± 0.9 and 12.0 ± 1.2 cm^-1 for Rps. viridis and Rb. sphaeroides respectively. An oscillation mechanism is discussed for ET from P* to B_A and then to H_A. It is assumed that water fulfils the transmission function in the primary ET. It is obtained that the h_μ-mode of 304 cm^-1 governs the secondary ET from H_A to ubiquinone in Rb. sphaeroides RC.

Citation Download Citation

Vladimir S. Pavlovich "Conception of hystons in bacterial photosynthesis: spectra, exciton dynamics, and electron transfer", Proc. SPIE 6727, ICONO 2007: Nonlinear Laser Spectroscopy and High-Precision Measurements; and Fundamentals of Laser Chemistry and Biophotonics, 67271T (9 July 2007); https://doi.org/10.1117/12.752399

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