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Biophys. J. BioFAST: First Published January 6, 2006. doi:10.1529/biophysj.105.075903
© 2006 by the Biophysical Society.

A more recent version of this article appeared on April 1, 2006.
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PHOTOBIOPHYSICS

Spectral trends in the fluorescence of single bacterial light-harvesting complexes: experiments and modified Redfield simulations

Danielis Rutkauskas 1*, Vladimir Novoderezhkin 2, Andrew Gall 3, John Olsen 4, Richard J. Cogdell 3, C N Hunter 5 and Rienk van Grondelle 6

1 Vrije Universiteit, Amsterdam
2 Moscow State University
3 University of Glasgow
4 University of Sheffield
5 University of Sheffield Western Bank
6 Vrije Universiteit

* To whom correspondence should be addressed. E-mail: danielis{at}nat.vu.nl.

Submitted on October 13, 2005
Revised on November 26, 2005
Accepted on 16 December 2005


  Abstract
In this work we present and discuss the single-molecule fluorescence spectra of a variety of species of light-harvesting complexes: LH2 of Rhodopseudomonas acidophila, Rhodobacter sphaeroides, Rhodospirillum molischianum, and LH1 of Rhodobacter sphaeroides. The emission spectrum of these complexes varies as a function of time as was described in earlier work (Rutkauskas, et al. 2005, Rutkauskas, et al. 2004). For each type of complex, we observe a pronounced and well reproducible characteristic relationship between the fluorescence spectral parameters of the peak wavelength, width and asymmetry. This dependence for the LH2 complexes can be quantitatively explained on the basis of a disordered exciton model by varying the static disorder and phonon coupling parameters. In addition, a correlation of the pigment site energies has to be assumed to interpret the behavior of the LH1 complex.

Key Words: LH1, LH2, delocalization, fluorescence, photosynthetic, single molecule




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R. Croce, A. Chojnicka, T. Morosinotto, J. A. Ihalainen, F. van Mourik, J. P. Dekker, R. Bassi, and R. van Grondelle
The Low-Energy Forms of Photosystem I Light-Harvesting Complexes: Spectroscopic Properties and Pigment-Pigment Interaction Characteristics
Biophys. J., October 1, 2007; 93(7): 2418 - 2428.
[Abstract] [Full Text] [PDF]


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Copyright © 2006 by the Biophysical Society.