Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 10: Posters 2: Biomolecules, Energy Transfer, Clusters, Quantum Chemistry, Molecular Dynamics and Chirality

MO 10.1: Poster

Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais

Polarization-resolved fluorescence-excitation spectroscopy of individual chlorosomes from the bchR - and bchQR - Mutant of Chlorobaculum tepidum — •Lisa Maria Wohlrab¹, Marc Jendrny¹, Donald A. Bryant², and Jürgen Köhler¹ — ¹Experimental Physics IV and Bayreuth Institute of Macromolecular Research (BIMF), Universität Bayreuth, Universitätsstr. 30, 95447 Bayreuth, Germany — ²Department of Biochemistry & Molecular Biology, The Pennsylvania State University, 107 Althouse Lab, University Park, PA 16802

Chlorosomes are the main light-harvesting antennae complexes in green photosynthetic bacteria and contain bacteriochlorophyll c, d or e depending on the species. The chromophores self-assemble into aggregates without the involvement of a protein scaffold, and are organized in rods of 100 nm - 200 nm length and 20 nm - 50 nm width. For the species Chlorobaculum tepidum mutants (bchR and bchQR) have been prepared. The mutations affect the side groups of the BChl molecules.

Polarization resolved fluorescence-excitation spectroscopy on individual mutated chlorosomes reveal the importance of the methylation at C−8² position of the bacteriochlorophylls for the spectral properties of the chlorosomes.