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Título : Efficient Energy Transfer from the Carotenoid S2 State in a Photosynthetic Light-Harvesting Complex
Autor : Macpherson, Alisdair N.; Arellano, Juan B. ; Fraser, Niall J.; Cogdell, Richard J.; Gillbro, Tomas
Palabras clave : Light harvesting complex
carotenoid
bacteriochlorophyll
energy transfer
singlet excited state
Rhodopseudomonas acidophila 10050
Fecha de publicación : feb-2001
Editor: Rockefeller University Press
Citación : Biophysical Journal (2001) 80:923-930
Resumen: Previously, the spatial arrangement of the carotenoid and bacteriochlorophyll molecules in the peripheral light-harvesting (LH2) complex from Rhodopseudomonas acidophila strain 10050 has been determined at high resolution. Here, we have time resolved the energy transfer steps that occur between the carotenoid's initial excited state and the lowest energy group of bacteriochlorophyll molecules in LH2. These kinetic data, together with the existing structural information, lay the foundation for understanding the detailed mechanisms of energy transfer involved in this fundamental, early reaction in photosynthesis. Remarkably, energy transfer from the rhodopin glucoside S2 state, which has an intrinsic lifetime of ~120 fs, is by far the dominant pathway, with only a minor contribution from the longer-lived S1 state.
Versión del editor: http://www.biophysj.org/cgi/reprint/80/2/923
URI : http://hdl.handle.net/10261/8145
ISSN: 0006-3495
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