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

Schröter, Marco LU ; Alcocer, Marcelo J.P. LU ; Cogdell, Richard J. ; Kühn, Oliver and Zigmantas, Donatas LU orcid (2018) In Journal of Physical Chemistry Letters 9(6). p.1340-1345
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... (More)

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.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry Letters
volume
9
issue
6
pages
6 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85044006995
  • pmid:29488385
ISSN
1948-7185
DOI
10.1021/acs.jpclett.8b00438
language
English
LU publication?
yes
id
1fff63fb-1250-4865-a4a2-c921319ebc23
date added to LUP
2018-03-29 08:32:45
date last changed
2021-10-06 03:50:19
@article{1fff63fb-1250-4865-a4a2-c921319ebc23,
  abstract     = {<p>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.</p>},
  author       = {Schröter, Marco and Alcocer, Marcelo J.P. and Cogdell, Richard J. and Kühn, Oliver and Zigmantas, Donatas},
  issn         = {1948-7185},
  language     = {eng},
  month        = {03},
  number       = {6},
  pages        = {1340--1345},
  publisher    = {The American Chemical Society (ACS)},
  series       = {Journal of Physical Chemistry Letters},
  title        = {Origin of the Two Bands in the B800 Ring and Their Involvement in the Energy Transfer Network of Allochromatium vinosum},
  url          = {http://dx.doi.org/10.1021/acs.jpclett.8b00438},
  doi          = {10.1021/acs.jpclett.8b00438},
  volume       = {9},
  year         = {2018},
}