Photoselection studies of the P-800 band in the photoreaction center of Rhodospirillum rubrum

Abstract

Polarization measurements of light-induced absorption changes in photoreaction center prepared from Rhodospirillum rubrum indicate that the 870 nm band is most likely due to a single transition dipole. The 800 nm band appears to be formed by transition dipoles with at least three different orientations. In photoreaction center from strain G9, none of the transition dipoles of the 800 nm band appears to form an angle larger than 70° with the 870 nm transition dipole.