Protein dynamics control of electron transfer in photosynthetic reaction centers from Rps. sulfoviridis.

ABSTRACT: In the cycle of photosynthetic reaction centers, the initially oxidized special pair of bacteriochlorophyll molecules is subsequently reduced by an electron transferred over a chain of four hemes of the complex. Here, we examine the kinetics of electron transfer between the proximal heme c-559 of the chain and the oxidized special pair in the reaction center from Rps. sulfoviridis in the range of temperatures from 294 to 40 K. The experimental data were obtained for three redox states of the reaction center, in which one, two, or three nearest hemes of the chain are reduced prior to special pair oxidation. The experimental kinetic data are analyzed in terms of a Sumi-Marcus-type model developed in our previous paper,1 in which similar measurements were reported on the reaction centers from

SUBMITTER: Medvedev ES 

PROVIDER: S-EPMC2855845 | biostudies-literature | 2008 Mar

REPOSITORIES: biostudies-literature