Functioning of oligomeric-type light-harvesting antenna

In our previous work, we developed, for the first time, a theory of excitation energy transfer within an oligomeric-type light-harvesting antenna and, in particular, within the chlorosome of green bacteria (Biophys.J., 1996, vol.71, pp.995-1010). The theory was recently developed for a new original...

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Bibliographic Details
Published in:Biochemistry and molecular biology international 1997-06, Vol.42 (1), p.21-27
Main Authors: Timpmann, K.E, Taisova, A.S, Novoderezhkin, V.I, Fetisova, Z.G
Format: Article
Language:English
Subjects:
Bacterial Proteins - chemistry
Bacterial Proteins - metabolism
Bacteriochlorophylls - chemistry
Bacteriochlorophylls - metabolism
Chlorobi - ultrastructure
Energy Transfer
functioning of oligomeric‐type antenna
green bacteria
Kinetics
Light
light harvesting complex
light‐harvesting antenna
Macromolecular Substances
photosynthesis
Space life sciences
Spectrometry, Fluorescence
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Summary:In our previous work, we developed, for the first time, a theory of excitation energy transfer within an oligomeric-type light-harvesting antenna and, in particular, within the chlorosome of green bacteria (Biophys.J., 1996, vol.71, pp.995-1010). The theory was recently developed for a new original excitor model of aggregation of chlorosomal pigments, bacteriochlorophylls (BChl) c/d/e (Biochem. Mol.Biol.Int., 1996, vol.40, No.2, pp. 243-252). In this paper, it was demonstrated with picosecond fluorescence spectroscopy that this theory explains the antenna-size-dependent kinetics of fluorescence decay in chlorosomal antenna, measured for intact cells of different cultures of the green bacterium Chlorobium limicola with different chlorosomal antenna size determined by electron microscopic examination of the ultrathin sections of the cells. According to our model, the energy transfer dynamics within the chlorosome imply the formation of a cylindrical excitor, delocalized over a tubular aggregate of BChl c chains, and inductive-resonance-type transfer of such a cylindrical excitor between the nearest tubular BChl c aggregates and to BChl a of the chlorosome.
ISSN:1039-9712
1521-6543
1521-6551
DOI:10.1080/15216549700202391