Abstract
We have demonstrated temperature-dependence of the steady-state fluorescence lineshape of the bacteriochlorophyll (BChl) c band measured for intact cells of the green bacterium Chloroflexus aurantiacus over the 1.8–293 K range. The measured temperature-dependence has been shown to be in good agreement with the theoretical one, calculated for our original model of pigment organization in the chlorosomal oligomeric antenna of green photosynthetic bacteria based on spectral hole-burning studies (Fetisova, Z.G. et al. (1996) Biophys. J. 71, 995–1010). This model implies that the BChl c antenna unit is a tubular aggregate of six exciton-coupled linear pigment chains having the exciton level structure with strongly allowed higher levels.
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