Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 68: Laserspektroskopie I
Q 68.6: Vortrag
Freitag, 23. März 2007, 11:45–12:00, 5K
Modelling the time- and wavelength resolved fluorescence dynamics in the PBP-antenna of the phototrophic cyanobacterium Acaryochloris marina — •Justus Fuesers1, Karin Wache1, Franz-Josef Schmitt1, Stefan Andree1, Christoph Theiss1, Hans Joachim Eichler1, and Hann-Jörg Eckert2 — 1Institute of Optics, Technical University Berlin, Germany — 2Max-Volmer-Laboratory for Biophysical Chemistry, Technical University Berlin, Germany
A.marina discovered only in 1996 has a unique composition of the light harvesting system. The membrane intrinsic chlorophyll (Chl) antenna contains mainly Chl d instead of the usually dominant Chl a and the membrane extrinsic phycobiliprotein (PBP) antenna has a simpler rod shaped structure than in typical cynobacteria [1].
Time- and wavelength resolved fluorescence spectroscopy with a time resolution of 20 ps showed fast excitation energy transfer kinetics of 20-30 ps along the PBP antenna of A.marina followed by a transfer to the Chl d antenna with a time constant of about 70 ps. Calculations of different models describing the energy transfer in the PBP-antenna system of A.marina are compared with the experimental results.
[1] J. Marquardt, H. Senger, H. Miyashita, S. Miyachi, E. Mörschel, "Isolation and Characterization of phycobiliprotein aggregates from Acaryochloris marina, a prochloron like prokaryote containing mainly chlorophyll d" FEBS Lett 410 ,428-432 (1997)