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V. N. KHARKYANEN, Eh. O. ANDREYEV, Yu. M. BARABASH, Eh. L. MARTYNCHUK, and M. A. ZABOLOTNYY
«Model of Photoinduced Conformation Changes in Reaction Centres of Biomolecules»
0995–01008 (2008)

PACS numbers: 81.07.Nb, 81.16.Fg, 82.20.-w, 82.30.Fi, 82.37.Vb, 82.39.Jn, 82.50.-m

The photoinduced changes in structure of a molecular complex of reactionary centre (RC) of Rhodobacter sphaeroides in the course of intramolecular electron transfer are investigated. As revealed, the relaxation kinetics of RC photomobilization electron possesses S-shaped time dependence of electron return rate from an acceptor after exciting-light switching off. A two-level model of electron transport is proposed. Within this model, a set of identical, dynamical in time RCs is considered. These RCs possess non-exponential electron return kinetics, which is caused by viscoelastic properties of RCs structure and environment. The analysis of x-ray structural data for RCs, which are in light-adapted and dark-adapted states, is carried out. A possible link of RC-relaxation slow component and movement of the Qb ubiquinone deformed part within the viscous environment during its return in dark-adapted state conformation is discussed.