Exciton Dynamics in the Chlorosomal Antenna of the Green Bacterium Chloroflexus Aurantiacus: Experimental and Theoretical Studies of Femtosecond Pump-probe Spectra

Overview

Journal Photosynth Res

Publisher Springer

Date 2005 Oct 18

PMID 16228498

Citations 4

Authors

Andrey Yakovlev

Vladimir Novoderezhkin

Alexandra Taisova

Zoya Fetisova

Affiliations

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Abstract

Femtosecond absorption difference spectra were measured for chlorosomes isolated from the green bacterium Chloroflexus aurantiacus at room temperature. Using the relative difference absorption of the oligomeric BChl c and monomeric BChl a bands, the size of a unit BChl c aggregate as well as the exciton coherence size were estimated for the chlorosomal BChl c antenna under study. A quantitative fit of the data was obtained within the framework of the exciton model proposed before [Fetisova et al. (1996) Biophys J 71: 995-1010]. The size of the antenna unit was found to be 24 exciton-coupled BChl c molecules. The anomalously high bleaching value of the oligomeric B740 band with respect to the monomeric B795 band provided the direct evidence for a high degree of exciton delocalization in the chlorosomal B740 BChl c antenna. The effective delocalization size of individual exciton wavefunctions (the thermally averaged inverse participation ratio) in the chlorosomal BChl c antenna is 9.5, whereas the steady-state wavepacket corresponds to the coherence size (the inverse participation ratio of the density matrix) of 7.4 at room temperature.

Citing Articles

Superradiance of bacteriochlorophyll c aggregates in chlorosomes of green photosynthetic bacteria.

Malina T, Koehorst R, Bina D, Psencik J, van Amerongen H Sci Rep. 2021; 11(1):8354.

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Q-band hyperchromism and B-band hypochromism of bacteriochlorophyll c as a tool for investigation of the oligomeric structure of chlorosomes of the green photosynthetic bacterium Chloroflexus aurantiacus.

Yakovlev A, Taisova A, Fetisova Z Photosynth Res. 2020; 146(1-3):95-108.

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Variability of aggregation extent of light-harvesting pigments in peripheral antenna of Chloroflexus aurantiacus.

Yakovlev A, Taisova A, Arutyunyan A, Shuvalov V, Fetisova Z Photosynth Res. 2017; 133(1-3):343-356.

PMID: 28361448 DOI: 10.1007/s11120-017-0374-y.

Orientation of B798 BChl a Q y transition dipoles in Chloroflexus aurantiacus chlorosomes: polarized transient absorption spectroscopy studies.

Yakovlev A, Novoderezhkin V, Taisova A, Shuvalov V, Fetisova Z Photosynth Res. 2014; 125(1-2):31-42.

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