Excitation Energy Transfer from Bacteriochlorophyll b in the B800 Site to B850 Bacteriochlorophyll a in Light-Harvesting Complex 2

2021 ◽  
Vol 125 (8) ◽  
pp. 2009-2017
Author(s):  
Yoshitaka Saga ◽  
Madoka Yamashita ◽  
Yuto Masaoka ◽  
Tsubasa Hidaka ◽  
Michie Imanishi ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Light Harvesting ◽  
Excitation Energy Transfer ◽  
Bacteriochlorophyll A ◽  
Light Harvesting Complex ◽  
Bacteriochlorophyll B

Excitation Energy Transfer in Dimeric Light Harvesting Complex I:  A Combined Streak-Camera/Fluorescence Upconversion Study

2001 ◽  
Vol 105 (41) ◽  
pp. 10132-10139 ◽  
Author(s):  
Bas Gobets ◽  
John T. M. Kennis ◽  
Janne A. Ihalainen ◽  
Michela Brazzoli ◽  
Roberta Croce ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Complex I ◽  
Light Harvesting ◽  
Streak Camera ◽  
Excitation Energy Transfer ◽  
Light Harvesting Complex ◽  
Fluorescence Upconversion

scholarly journals Strategies to enhance the excitation energy-transfer efficiency in a light-harvesting system using the intra-molecular charge transfer character of carotenoids

2017 ◽  
Vol 198 ◽  
pp. 59-71 ◽  
Author(s):  
Nao Yukihira ◽  
Yuko Sugai ◽  
Masazumi Fujiwara ◽  
Daisuke Kosumi ◽  
Masahiko Iha ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Charge Transfer ◽  
Excitation Energy ◽  
Brown Algae ◽  
Light Harvesting ◽  
Excitation Energy Transfer ◽  
Light Harvesting Complexes ◽  
Light Harvesting Complex ◽  
Molecular Charge ◽  
Intra Molecular Charge Transfer

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 (∼95%) energy-transfer from fucoxanthin to chlorophyllain 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 rubrumG9+ (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 bacteriochlorophyllawhen they are bound to the light-harvesting 1 apo-proteins.

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