Low light adaptation: energy transfer processes in different types of light harvesting complexes from Rhodopseudomonas palustris.

Biophysical Journal
Vladimíra MoulisováR J Cogdell

Abstract

Energy transfer processes in photosynthetic light harvesting 2 (LH2) complexes isolated from purple bacterium Rhodopseudomonas palustris grown at different light intensities were studied by ground state and transient absorption spectroscopy. The decomposition of ground state absorption spectra shows contributions from B800 and B850 bacteriochlorophyll (BChl) a rings, the latter component splitting into a low energy and a high energy band in samples grown under low light (LL) conditions. A spectral analysis reveals strong inhomogeneity of the B850 excitons in the LL samples that is well reproduced by an exponential-type distribution. Transient spectra show a bleach of both the low energy and high energy bands, together with the respective blue-shifted exciton-to-biexciton transitions. The different spectral evolutions were analyzed by a global fitting procedure. Energy transfer from B800 to B850 occurs in a mono-exponential process and the rate of this process is only slightly reduced in LL compared to high light samples. In LL samples, spectral relaxation of the B850 exciton follows strongly nonexponential kinetics that can be described by a reduction of the bleach of the high energy excitonic component and a red-shift of the l...Continue Reading

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Citations

Feb 7, 2012·Proceedings of the National Academy of Sciences of the United States of America·Larry LüerRichard J Cogdell
Feb 10, 2016·Scientific Reports·Marco FerrettiRienk van Grondelle
Nov 5, 2015·Biophysical Journal·Larry LüerRichard J Cogdell
Dec 30, 2015·Journal of Bacteriology·Kieran B PechterCaroline S Harwood
May 5, 2018·Photosynthesis Research·Dariusz M NiedzwiedzkiRichard J Cogdell
Apr 30, 2021·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Ying ShiJian-Ping Zhang
Jan 24, 2020·The Journal of Physical Chemistry. B·Ashley L TongGabriela S Schlau-Cohen
Dec 14, 2018·The Journal of Physical Chemistry. B·Tenzin KunselThomas L C Jansen

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