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2D Electronic Spectroscopy Reveals Excitonic Structure in the Baseplate of a Chlorosome

Dostal, Jakub LU ; Vacha, Frantisek; Psencik, Jakub and Zigmantas, Donatas LU (2014) In The Journal of Physical Chemistry Letters 5(10). p.1743-1747
Abstract
In green photosynthetic bacteria, the chlorosome baseplate mediates excitation energy transfer from the interior of the light-harvesting chlorosome toward the reaction centers. However, the electronic states of the baseplate remain unexplored, hindering the mechanistic understanding of the baseplate as an excitation energy collector and mediator. Here we use two-dimensional spectroscopy to study the excited state structure and internal energy relaxation in the baseplate of green sulfur bacterium Chlorobaculum tepidum. We resolved an exciton system with four energy states, indicating that the organization of the pigments in the baseplate is more complex than was thought before and constitutes at least four bacteriochlorophyll molecules in a... (More)
In green photosynthetic bacteria, the chlorosome baseplate mediates excitation energy transfer from the interior of the light-harvesting chlorosome toward the reaction centers. However, the electronic states of the baseplate remain unexplored, hindering the mechanistic understanding of the baseplate as an excitation energy collector and mediator. Here we use two-dimensional spectroscopy to study the excited state structure and internal energy relaxation in the baseplate of green sulfur bacterium Chlorobaculum tepidum. We resolved an exciton system with four energy states, indicating that the organization of the pigments in the baseplate is more complex than was thought before and constitutes at least four bacteriochlorophyll molecules in a close contact. Based on the finding that the energy of the baseplate states is in the same range as in the adjacent Fenna-Matthews-Olson complex, we propose a "lateral" energy transfer pathway, where excitation energy can flow through the photosynthetic unit via all the states of individual complexes. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Letters
volume
5
issue
10
pages
1743 - 1747
publisher
The American Chemical Society
external identifiers
  • wos:000336199000022
  • scopus:84901003223
ISSN
1948-7185
DOI
10.1021/jz5005279
language
English
LU publication?
yes
id
d9296a9f-45e0-4f02-bb10-cbb9eee0ba65 (old id 4559080)
date added to LUP
2014-07-17 14:27:14
date last changed
2017-09-03 04:03:41
@article{d9296a9f-45e0-4f02-bb10-cbb9eee0ba65,
  abstract     = {In green photosynthetic bacteria, the chlorosome baseplate mediates excitation energy transfer from the interior of the light-harvesting chlorosome toward the reaction centers. However, the electronic states of the baseplate remain unexplored, hindering the mechanistic understanding of the baseplate as an excitation energy collector and mediator. Here we use two-dimensional spectroscopy to study the excited state structure and internal energy relaxation in the baseplate of green sulfur bacterium Chlorobaculum tepidum. We resolved an exciton system with four energy states, indicating that the organization of the pigments in the baseplate is more complex than was thought before and constitutes at least four bacteriochlorophyll molecules in a close contact. Based on the finding that the energy of the baseplate states is in the same range as in the adjacent Fenna-Matthews-Olson complex, we propose a "lateral" energy transfer pathway, where excitation energy can flow through the photosynthetic unit via all the states of individual complexes.},
  author       = {Dostal, Jakub and Vacha, Frantisek and Psencik, Jakub and Zigmantas, Donatas},
  issn         = {1948-7185},
  language     = {eng},
  number       = {10},
  pages        = {1743--1747},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Letters},
  title        = {2D Electronic Spectroscopy Reveals Excitonic Structure in the Baseplate of a Chlorosome},
  url          = {http://dx.doi.org/10.1021/jz5005279},
  volume       = {5},
  year         = {2014},
}