Excitation transfer connectivity in different purple bacteria: a theoretical and experimental study

Biochimica Et Biophysica Acta
Matthieu de RivoyreJérôme Lavergne

Abstract

Photosynthetic membranes accommodate densely packed light-harvesting complexes which absorb light and convey excitation to the reaction center (RC). The relationship between the fluorescence yield (phi) and the fraction (x) of closed RCs is informative about the probability for an excitation reaching a closed RC to be redirected to another RC. In this work, we have examined in this respect membranes from various bacteria and searched for a correlation with the arrangement of the light-harvesting complexes as known from atomic force or electron microscopies. A first part of the paper is devoted to a theoretical study analyzing the phi(x) relationship in various models: monomeric or dimeric RC-LH1 core complexes, with or without the peripheral LH2 complexes. We show that the simple "homogeneous" kinetic treatment used here agrees well with more detailed master equation calculations. We also discuss the agreement between information derived from the present technique and from singlet annihilation experiments. The experimental results show that the enhancement of the cross section of open RCs due to excitation transfer from closed units varies from 1.5 to 3 depending on species. The ratio of the core to core transfer rate (includin...Continue Reading

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Citations

Jun 25, 2013·Photosynthesis Research·Alexandrina Stirbet
May 8, 2013·Proceedings of the National Academy of Sciences of the United States of America·Liam ClearyJianshu Cao
Oct 1, 2015·Molecular Microbiology·David J MothersoleC Neil Hunter
Dec 17, 2014·Photosynthesis Research·André VerméglioFabrice Rappaport
Jul 2, 2014·Biochimica Et Biophysica Acta·Kõu TimpmannArvi Freiberg
Nov 5, 2015·Biophysical Journal·Larry LüerRichard J Cogdell
Aug 16, 2016·Biochimica Et Biophysica Acta·Arvi FreibergKõu Timpmann
Nov 13, 2019·Scientific Reports·Gilles De LucaAndré Verméglio
Apr 18, 2021·Physical Review. E·Amit Federbush, Yacov Kantor
Jun 18, 2021·Physical Review. E·Jean-Christian Anglès d'Auriac, Ferenc Iglói

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