Elementary Energy Transfer Pathways in Allochromatium vinosum Photosynthetic Membranes.

ABSTRACT: Allochromatium vinosum (formerly Chromatium vinosum) purple bacteria are known to adapt their light-harvesting strategy during growth according to environmental factors such as temperature and average light intensity. Under low light illumination or low ambient temperature conditions, most of the LH2 complexes in the photosynthetic membranes form a B820 exciton with reduced spectral overlap with LH1. To elucidate the reason for this light and temperature adaptation of the LH2 electronic structure, we performed broadband femtosecond transient absorption spectroscopy as a function of excitation wavelength in A. vinosum membranes. A target analysis of the acquired data yielded individual rate constants for all relevant elementary energy transfer (ET) processes. We found that the ET dynamics i

SUBMITTER: Luer L 

PROVIDER: S-EPMC4643211 | biostudies-literature | 2015 Nov

REPOSITORIES: biostudies-literature