Ultrafast Energy Transfer in Chlorosomes from the Green Photosynthetic Bacterium Chloroflexus aurantiacus

Energy transfers between the bacteriochlorophyll c and a antennae in light-harvesting chlorosomes from the green bacterium Chloroflexus aurantiacus have been studied in two-color pump−probe experiments with improved sensitivity and wavelength versatility. The BChl c → BChl a energy transfers are wel...

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Bibliographic Details
Published in:Journal of physical chemistry (1952) 1996-02, Vol.100 (9), p.3320-3322
Main Authors: Savikhin, Sergei, Zhu, Yinwen, Blankenship, Robert E, Struve, Walter S
Format: Article
Language:English
Subjects:
Bacterial Proteins - metabolism
Bacteriochlorophylls - metabolism
Chlorobi - metabolism
Chlorobi - physiology
Chlorobi - ultrastructure
Energy Transfer
Kinetics
Light-Harvesting Protein Complexes
Organelles - metabolism
Organelles - physiology
Photosynthetic Reaction Center Complex Proteins
Space life sciences
Spectrum Analysis
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Summary:Energy transfers between the bacteriochlorophyll c and a antennae in light-harvesting chlorosomes from the green bacterium Chloroflexus aurantiacus have been studied in two-color pump−probe experiments with improved sensitivity and wavelength versatility. The BChl c → BChl a energy transfers are well simulated with biexponential kinetics, with lifetimes of 2−3 and 11 ps. They do not exhibit an appreciable subpicosecond component. In the context of a kinetic model for chlorosomes, these lifetimes suggest that both internal BChl c processes and the BChl c → BChl a energy-transfer step contribute materially to the empirical rod-to-baseplate energy-transfer kinetics.
ISSN:0022-3654
1541-5740
DOI:10.1021/jp953734k