Carotenoid-to-bacteriochlorophyll energy transfer through vibronic coupling in LH2 from Phaeosprillum molischianum

Photosynthesis Research
Erling ThyrhaugJürgen Hauer

Abstract

The peripheral light-harvesting antenna complex (LH2) of purple photosynthetic bacteria is an ideal testing ground for models of structure-function relationships due to its well-determined molecular structure and ultrafast energy deactivation. It has been the target for numerous studies in both theory and ultrafast spectroscopy; nevertheless, certain aspects of the convoluted relaxation network of LH2 lack a satisfactory explanation by conventional theories. For example, the initial carotenoid-to-bacteriochlorophyll energy transfer step necessary on visible light excitation was long considered to follow the Förster mechanism, even though transfer times as short as 40 femtoseconds (fs) have been observed. Such transfer times are hard to accommodate by Förster theory, as the moderate coupling strengths found in LH2 suggest much slower transfer within this framework. In this study, we investigate LH2 from Phaeospirillum (Ph.) molischianum in two types of transient absorption experiments-with narrowband pump and white-light probe resulting in 100 fs time resolution, and with degenerate broadband 10 fs pump and probe pulses. With regard to the split Qx band in this system, we show that vibronically mediated transfer explains both th...Continue Reading

References

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Citations

Apr 16, 2020·Physical Chemistry Chemical Physics : PCCP·Mantas JakučionisDarius Abramavičius
Sep 3, 2017·The Journal of Chemical Physics·Václav Perlík, František Šanda
Aug 10, 2018·Nature Communications·Elena MeneghinElisabetta Collini
Oct 2, 2019·Physical Review Letters·Alejandro D SomozaMartin B Plenio
Nov 24, 2020·Journal of Basic Microbiology·Huiying YueYaqiong Jia
Jan 20, 2021·Journal of the American Chemical Society·Jonathan D SchultzMichael R Wasielewski
Apr 21, 2021·Physical Chemistry Chemical Physics : PCCP·Daniel A GacekPeter J Walla
Feb 20, 2019·The Journal of Physical Chemistry. B·Jan P Götze

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Methods Mentioned

BETA
size exclusion chromatography

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