[Mechanism of charge separation and their stabilization in bacterial reaction centers]
A G Iakovlev1, L G Vasil'eva, A Ia Shkuropatov
1Department of Photobiophysics, Belozerskii Research Institute, Moscow State University, Vorob'evy Gory, 119992 Russia.
Abstract:
The nuclear wavepacket formed by 20-fs excitation on the P* potential energy surface in native and mutant (YM210W and YM210L) reaction centers of Rhodobacter (Rb.) sphaeroides and Chloroflexus (C.) aurantiacus RCs was found to be reversibly transferred to the P+BA- surface at 120, 380, and 640-fs delays (monitored by measurements of BA- absorption at 1020-1028 nm). The reaction centers of YM210W(L) mutant show the most simple pattern of fs oscillations with a period of 230 fs in stimulated emission from P* and in the product P+BA-. The mechanisms of the electron transfer pathway between P* and BA and of the stabilization of the state P+BA- in bacterial reaction centers are discussed.
Related Concept Videos
The Photochemical Reaction Center
The Antenna Complex
Photosystem I
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
Anoxygenic Photosynthesis
Photosystem II
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment molecules...
Electron Transport Chain Components

