Femtosecond kinetics of electron transfer in the bacteriochlorophyll(M)-modified reaction centers from Rhodobacter sphaeroides (R-26)

FEBS Letters
A M StreltsovV A Shuvalov

Abstract

Formation of the vibronic wavepacket by 90-fs excitation of the primary electron donor P in bacteriochlorophyll(M)-modified reaction centers is shown to induce nuclear motions accompanied by (1) oscillation of the stimulated emission from excited primary electron donor P* and (2) wavepacket motions leading to electron transfer at 293 K from P* to bacteriochlorophyll (B(L)) and then to bacteriopheophytin (H(L)). The latter motions have low frequency (about 15 cm-1) and are related to protein-nuclear motions which are along the reaction coordinate. When the wavepacket approaches the intersection of the reactant (P*B(L)) and product (P+B(L)-) potential energy surfaces (approximately 1.5 ps delay), about 60% of P* is converted to the P+B(L)- state. The P+H(L)- state formation is delayed by approximately 2 ps with respect to that of P+B(L)-. It is suggested that the wavepacket is transferred to and moves also slowly on the P+B(L)- potential energy surface and approaches the intersection of the surfaces of P+B(L)- and P+H(L)- within approximately 2 ps (approximately 8 cm-1), indicating the electron transfer to H(L).

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Citations

Jul 11, 2006·Biochimica Et Biophysica Acta·Andrei G YakovlevVladimir A Shuvalov
Feb 17, 2006·Physical Chemistry Chemical Physics : PCCP·Rienk van Grondelle, Vladimir I Novoderezhkin
Sep 5, 2020·Critical Reviews in Biochemistry and Molecular Biology·Michael GorkaJohn H Golbeck
Apr 27, 1999·Biochimica Et Biophysica Acta·M H Vos, J L Martin
Sep 3, 2008·The Journal of Physical Chemistry. B·Nikolai Ivashin, Sven Larsson

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