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BP: Fachverband Biologische Physik

BP 11: Posters: Single-Molecule Biophysics

BP 11.14: Poster

Montag, 14. März 2011, 17:15–20:00, P3

The strong excitonic coupling is not an important factor in the fast excitation energy transfer in phycocyanin of A.marina. — •albert collins nganou assonkeng — Institute of Optics and Max-Volmer-Laboratory for Biophysical Chemistry, Technical University Berlin, Str. 17 Juni 135, 10623 Berlin, Germany

The Cyanobacterium Acaryochloris Marina (A.marina) is unique in nature because it contains Chl d instead of Chl a as major pigment. In addition to the Chl containing light harvesting antennas A.marina has also a Phycobiliprotein (PBP) antenna as a light harvesting complex that shows a more simple structure than phycobilisomes of other typical cyanobacteria. This PBP-antenna is a rod shaped complex consisting of three homo-hexamers containing Phycocyanin (PC) and one hetero-hexamer containing PC and Allophycocyanin (APC) absorbing in the spectral range between 560 nm and 630 nm, where the absorption of the chlorophylls is low. In order to get a better insight in the fundamental processes of excitation energy transfer (EET) in this antenna system we performed time resolved absorption studies as well as measurements of the transient anisotropy. The maximum anisotropy value of 0,37 that is close to theoretical limit for weak interaction of 0,4 indicates that strong excitonic coupling is not an important factor in the fast EET in PC of A.marina.