Beta-carotene to bacteriochlorophyll-c energy transfer in self-assembled aggregates mimicking chlorosomes

0348819 - BC 2012 RIV NL eng J - Článek v odborném periodiku
Alster, J. - Polívka, Tomáš - Arellano, J.B. - Chábera, P. - Vácha, František - Pšenčík, J.
Beta-carotene to bacteriochlorophyll-c energy transfer in self-assembled aggregates mimicking chlorosomes.
Chemical Physics. Roč. 373, 1-2 (2010), s. 90-97. ISSN 0301-0104. E-ISSN 1873-4421
Grant CEP: GA ČR GA206/09/0375
Výzkumný záměr: CEZ:AV0Z50510513
Klíčová slova: carotenoids * chlorosomes * energy transfer
Kód oboru RIV: BO - Biofyzika
Impakt faktor: 2.017, rok: 2010

Carotenoids are together with bacteriochlorophylls important constituents of chlorosomes, the light-harvesting antennae of green photosynthetic bacteria. Majority of bacteriochlorophyll molecules form self-assembling aggregates inside the chlorosomes. In this work, the ability of beta-carotene to induce aggregation of bacteriochlorophyll-c in aqueous buffer was studied. Excitation relaxation and energy transfer in the carotenoid-bacteriochlorophyll assemblies were measured using femtosecond and nanosecond transient absorption spectroscopy. A fast, similar to 100-fs energy transfer from the S2 state of beta-carotene to bacteriochlorophyll c was revealed, while no evidence for significant energy transfer from the S1 state was found. Picosecond formation of the carotenoid triplet state was observed, which was likely generated by singlet homo-fission from the S1 state of beta-carotene.
Trvalý link: http://hdl.handle.net/11104/0189241