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

D. Rutkauskas, V. Novoderezhkin, A. Gall, J. Olsen, R.J. Cogdell, C.N. Hunter, R. van Grondelle

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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, and 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. 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. © 2006 by the Biophysical Society.
Original languageEnglish
Pages (from-to)2475-2485
JournalBiophysical Journal
Volume90
Issue number7
DOIs
Publication statusPublished - 2006

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

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