Origin of the Two Bands in the B800 Ring and Their Involvement in the Energy Transfer Network of Allochromatium vinosum
(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
- Schröter, Marco LU ; Alcocer, Marcelo J.P. LU ; Cogdell, Richard J. ; Kühn, Oliver and Zigmantas, Donatas LU
- organization
- publishing date
- 2018-03-15
- 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
-
- pmid:29488385
- scopus:85044006995
- 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
- 2024-07-08 11:46:10
@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}}, }