Journal
FARADAY DISCUSSIONS
Volume 198, Issue -, Pages 59-71Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6fd00211k
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Funding
- JSPS KAKENHI [16H04181]
- Scientific Research on Innovative Areas All Nippon Artificial Photosynthesis Project for living Earth (AnApple) [24107002]
- Photosynthetic Antenna Research Center (PARC), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0001035]
- [25707028]
- [16K13863]
- Grants-in-Aid for Scientific Research [16H04181, 24107002, 16K13863, 26410183, 16K13646, 17K05935, 26706007] Funding Source: KAKEN
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Fucoxanthin is a carotenoid that is mainly found in light-harvesting complexes from brown algae and diatoms. Due to the presence of a carbonyl group attached to polyene chains in polar environments, excitation produces an excited intra-molecular charge transfer. This intra-molecular charge transfer state plays a key role in the highly efficient (similar to 95%) energy-transfer from fucoxanthin to chlorophyll a in the light-harvesting complexes from brown algae. In purple bacterial light-harvesting systems the efficiency of excitation energy-transfer from carotenoids to bacteriochlorophylls depends on the extent of conjugation of the carotenoids. In this study we were successful, for the first time, in incorporating fucoxanthin into a light-harvesting complex 1 from the purple photosynthetic bacterium, Rhodospirillum rubrum G9+ (a carotenoidless strain). Femtosecond pump-probe spectroscopy was applied to this reconstituted light-harvesting complex in order to determine the efficiency of excitation energy-transfer from fucoxanthin to bacteriochlorophyll a when they are bound to the light-harvesting 1 apo-proteins.
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