Journal
CHEMICAL PHYSICS
Volume 373, Issue 1-2, Pages 65-70Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemphys.2010.01.011
Keywords
Carotenoids; Light harvesting; Ultrafast spectroscopy; Cyanobacteria
Funding
- Netherlands Organization for Scientific Research through the Earth and Life Sciences Council (NWO-ALW)
- NWO-ALW through VIDI
- Rubicon grant
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We present a spectroscopic investigation of the light-harvesting role of carotenoids in aggregates of the IsiA pigment-protein complex of the cyanobacterium Synechocystis PCC 6803. The results show that carotenoids in IsiA transfer energy on the sub-100 fs timescale from the S(2) state to chlorophyll to about the same extent as in the related pigment-protein complexes CP43 and CP47. Selective excitation at the red edge of the S(2) absorption of the carotenoids shows that echinenone is more efficient in energy transfer to chlorophyll (37%) when compared to the other carotenoid species in the system (22%). (C) 2010 Elsevier B. V. All rights reserved.
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