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Title: Origin of the Two Bands in the B800 Ring and Their Involvement in the Energy Transfer Network of Allochromatium vinosum

Abstract

Bacterial photosynthesis features robust and adaptable energy-harvesting processes in which light-harvesting proteins play a crucial role. The peripheral light-harvesting complex of the purple bacterium Allochromatium vinosum is particularly distinct, featuring a double peak structure in its B800 absorption band. Two hypotheses—not necessarily mutually exclusive—concerning the origin of this splitting have been proposed; either two distinct B800 bacteriochlorophyll site energies are involved, or an excitonic dimerization of bacteriochlorophylls within the B800 ring takes place. Through the use of two-dimensional electronic spectroscopy, we present unambiguous evidence that excitonic interaction shapes the split band. We further identify and characterize all of the energy transfer pathways within this complex by using a global kinetic fitting procedure. Our approach demonstrates how the combination of two-dimensional spectral resolution and self-consistent fitting allows for extraction of information on light-harvesting processes, which would otherwise be inaccessible due to signal congestion.

Authors:
ORCiD logo [1];  [2];  [3];  [4]; ORCiD logo [2]
  1. Univ. of Rostock (Germany). Inst. of Physics; Lund Univ. (Sweden). Dept. of Chemical Physics
  2. Lund Univ. (Sweden). Dept. of Chemical Physics
  3. Univ. of Glasgow, Scotland (United Kingdom). Inst. of Molecular, Cell and Systems Biology, College of Medical, Veterinary and Life Sciences
  4. Univ. of Rostock (Germany). Inst. of Physics
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Photosynthetic Antenna Research Center (PARC)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1470602
Grant/Contract Number:  
SC0001035
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry Letters
Additional Journal Information:
Journal Volume: 9; Journal Issue: 6; Related Information: PARC partners with Washington University in St. Louis (lead); University of California, Riverside; University of Glasgow, UK; Los Alamos National Laboratory; University of New Mexico; New Mexico Corsortium; North Carolina State University; Northwestern University; Oak Ridge National Laboratory; University of Pennsylvania; Sandia National Laboratories; University of Sheffield, UK; Journal ID: ISSN 1948-7185
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; solar (fuels); photosynthesis (natural and artificial); biofuels (including algae and biomass); bio-inspired; charge transport; membrane; synthesis (novel materials); synthesis (self-assembly)

Citation Formats

Schröter, Marco, Alcocer, Marcelo J. P., Cogdell, Richard J., Kühn, Oliver, and Zigmantas, Donatas. Origin of the Two Bands in the B800 Ring and Their Involvement in the Energy Transfer Network of Allochromatium vinosum. United States: N. p., 2018. Web. doi:10.1021/acs.jpclett.8b00438.
Schröter, Marco, Alcocer, Marcelo J. P., Cogdell, Richard J., Kühn, Oliver, & Zigmantas, Donatas. Origin of the Two Bands in the B800 Ring and Their Involvement in the Energy Transfer Network of Allochromatium vinosum. United States. doi:10.1021/acs.jpclett.8b00438.
Schröter, Marco, Alcocer, Marcelo J. P., Cogdell, Richard J., Kühn, Oliver, and Zigmantas, Donatas. Wed . "Origin of the Two Bands in the B800 Ring and Their Involvement in the Energy Transfer Network of Allochromatium vinosum". United States. doi:10.1021/acs.jpclett.8b00438. https://www.osti.gov/servlets/purl/1470602.
@article{osti_1470602,
title = {Origin of the Two Bands in the B800 Ring and Their Involvement in the Energy Transfer Network of Allochromatium vinosum},
author = {Schröter, Marco and Alcocer, Marcelo J. P. and Cogdell, Richard J. and Kühn, Oliver and Zigmantas, Donatas},
abstractNote = {Bacterial photosynthesis features robust and adaptable energy-harvesting processes in which light-harvesting proteins play a crucial role. The peripheral light-harvesting complex of the purple bacterium Allochromatium vinosum is particularly distinct, featuring a double peak structure in its B800 absorption band. Two hypotheses—not necessarily mutually exclusive—concerning the origin of this splitting have been proposed; either two distinct B800 bacteriochlorophyll site energies are involved, or an excitonic dimerization of bacteriochlorophylls within the B800 ring takes place. Through the use of two-dimensional electronic spectroscopy, we present unambiguous evidence that excitonic interaction shapes the split band. We further identify and characterize all of the energy transfer pathways within this complex by using a global kinetic fitting procedure. Our approach demonstrates how the combination of two-dimensional spectral resolution and self-consistent fitting allows for extraction of information on light-harvesting processes, which would otherwise be inaccessible due to signal congestion.},
doi = {10.1021/acs.jpclett.8b00438},
journal = {Journal of Physical Chemistry Letters},
number = 6,
volume = 9,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
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