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Biophys J, March 2000, p. 1570-1577, Vol. 78, No. 3
and
*Centre for the Study of Excited States of Molecules, Huygens
Laboratory, Department of Biophysics, Leiden University,
2300 RA Leiden, the Netherlands
This paper reports a detailed spectroscopic study of the
B800 absorption band of individual light-harvesting 2 (LH2) complexes of the photosynthetic purple bacterium Rhodopseudomonas
acidophila at 1.2 K. By applying single-molecule detection
techniques to this system, details and properties can be revealed that
remain obscured in conventional ensemble experiments. For instance,
from fluorescence-excitation spectra of the individual complexes a more
direct measure of the diagonal disorder could be obtained. Further
spectral diffusion phenomena and homogeneous linewidths of individual
bacteriochlorophyll a (BChl a) molecules are observed, revealing
valuable information on excited-state dynamics. This work demonstrates
that it is possible to obtain detailed spectral information on
individual pigment-protein complexes, providing direct insight into
their electronic structure and into the mechanisms underlying the
highly efficient energy transfer processes in these systems.
Biophys J, March 2000, p. 1570-1577, Vol. 78, No. 3
© 2000 by the Biophysical Society 0006-3495/00/03/1570/08 $2.00
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