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Spectral Diffusion and Electron-Phonon Coupling of the B800 BChl a Molecules in LH2 Complexes from Three Different Species of Purple Bacteria |
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| Authors: | J. Baier,S. Oellerich,M. van Heel,J. Kö hler |
| Affiliation: | † Experimental Physics IV and Research Centre for Bio-Macromolecules, University of Bayreuth, Bayreuth, Germany ‡ Division of Infection and Immunity, Faculty of Biomedical and Life Sciences, Biomedical Research Building, University of Glasgow, Glasgow, United Kingdom § Department of Molecular Membrane Biology, Max-Planck Institute of Biophysics, Frankfurt, Germany ¶ Department of Biological Sciences, Imperial College London, London, United Kingdom ‖ Division of Molecular and Cellular Biology, Faculty of Biomedical and Life Sciences, Biomedical Research Building, University of Glasgow, Glasgow, United Kingdom |
| Abstract: | We have investigated the spectral diffusion and the electron-phonon coupling of B800 bacteriochlorophyll a molecules in the peripheral light-harvesting complex LH2 for three different species of purple bacteria, Rhodobacter sphaeroides, Rhodospirillum molischianum, and Rhodopseudomonas acidophila. We come to the conclusion that B800 binding pockets for Rhodobacter sphaeroides and Rhodopseudomonas acidophila are rather similar with respect to the polarity of the protein environment but that the packaging of the αβ-polypeptides seems to be less tight in Rb. sphaeroides with respect to the other two species. |
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