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MO: Fachverband Molekülphysik

MO 13: Molekülphysik Poster 1

MO 13.27: Poster

Tuesday, March 3, 2009, 16:30–19:00, VMP 8 Foyer

Spectroscopy of single low-light harvesting 2 complexes from Rps. palustris 2.1.6 — •Ralf Kunz¹, Tatas H.P. Brotosudarmo², Alastair T. Gardiner², Vladimira Moulisova², Richard J. Cogdell², and Jürgen Köhler¹ — ¹Experimental Physics IV, University of Bayreuth — ²Department of Biochemistry & Molecular Biology, Faculty of Biomedical & Life Sciences, University of Glasgow

Polarization dependent fluorescence-excitation spectra of single low-light (LL) harvesting 2 complexes from Rps. palustris strain 2.1.6 have been recorded at low temperature (1.4 K). The recorded spectra feature three main absorption bands around 800 nm, 820 nm, and 850 nm, respectively. On the basis of a structural model that assumes 9 αβ BChl dimers and a mixed apoprotein composition the spectra have been simulated. The best agreement between experiment and simulation is achieved for a model that considers 6 α-bound B820-like BChls and 12 B850-like BChls that are arranged in C₃ symmetry.