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Functioning of oligomeric‐type light‐harvesting antenna
Author(s) -
Timpmann K. E.,
Taisova A. S.,
Novoderezhkin V. I.,
Fetisova Z. G.
Publication year - 1997
Publication title -
iubmb life
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.132
H-Index - 113
eISSN - 1521-6551
pISSN - 1521-6543
DOI - 10.1080/15216549700202391
Subject(s) - chlorosome , bacteriochlorophyll , exciton , chemistry , förster resonance energy transfer , fluorescence , picosecond , molecular physics , delocalized electron , antenna (radio) , spectroscopy , photochemistry , physics , chemical physics , optics , condensed matter physics , pigment , quantum mechanics , telecommunications , laser , organic chemistry , computer science
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 exciton 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 exciton, delocalized over a tubular aggregate of BChl c chains, and inductive‐resonance‐type transfer of such a cylindrical exciton between the nearest tubular BChl c aggregates and to BChl a of the chlorosome.