Berlin 2005 – scientific programme
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AKB: Biologische Physik
AKB 200: Poster Session II
AKB 200.54: Poster
Tuesday, March 8, 2005, 17:00–19:00, Poster TU C
Watching conformational changes of pigment-protein complexes by optical single-molecule spectroscopy — •Silke Oellerich1,2, W.P.F. de Ruijter2, R.J. Cogdell3, J. Köhler1, and T.J. Aartsma2 — 1Experimentalphysik IV, Universität Bayreuth — 2Dept. of Biophysics, Leiden University, The Netherlands — 3Dept. of Biochemistry, University of Glasgow, Scotland
Pigment-protein complexes of photosynthetic purple bacteria are an interesting model system for studying pigment-pigment interactions as well as pigment-protein interactions. These interactions strongly affect the spectral properties of the complex. Changes or even fluctuations in these interactions result in spectral changes, which can be followed by optical single-molecule spectroscopy. Low-temperature fluorescence-excitation spectra of individual bacterial light-harvesting 3 complexes (LH3), which consists of 27 bacteriochlorophyll a pigments, provide a detailed picture about the influence of locally restricted changes in the pigment-protein interaction on the spectral properties of the entire complex.