Dichotomous Disorder versus Excitonic Splitting of the B800 Band of Allochromatium vinosum

Kell, Adam; Khmelnitskiy, Anton; Jassas, Mahboobe; Jankowiak, Ryszard

doi:10.1021/acs.jpclett.8b01584

Dichotomous Disorder versus Excitonic Splitting of the B800 Band of Allochromatium vinosum

Journal Article · Mon Jun 25 00:00:00 EDT 2018 · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/acs.jpclett.8b01584· OSTI ID:1539331

Kell, Adam ^[1]; Khmelnitskiy, Anton ^[2]; Jassas, Mahboobe ^[2]; ^[2]

Kansas State Univ., Manhattan, KS (United States); Kansas State University
Kansas State Univ., Manhattan, KS (United States)

The purple bacterium of Allochromatium vinosum has a distinct double peak structure of the 800 nm band (B800). Several hypotheses were proposed in the literature to explain its origin. Although recent 77 K two-dimensional electronic spectroscopy (2DES) data could neither refute or validate previous findings that the two B800 sub-bands are due to different site-energies (most likely due weakly and strongly hydrogen bonded B800 BChls [A. Kell et al., J. Phys. Chem. B 2017, 121, 9999]), the authors concluded that strong excitonic coupling of dimerized bacteriochlorophylls (BChls) within the B800 ring is largely responsible for the B800 split [M. Schroter et al., J. Phys. Chem. Lett. 2018, 9, 1340]. Here it is demonstrated that the latter is incorrect and excitonic interactions between BChls in the B800 ring, though present, are weak. This conclusion is based on an exciton model with dichotomous protein conformation disorder. We show that complementary data provided by hole burning (HB) spectroscopy, 2DES, and modeling studies provide a more comprehensive picture on the origin of the B800 band split. Energy transfer pathways from B800B → B800R, B800B → B850 and B800R → B850 revealed by HB spectroscopy are compared to those obtained via 2DES.

Research Organization:: Kansas State Univ., Manhattan, KS (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0006678

OSTI ID:: 1539331

Journal Information:: Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 14 Vol. 9; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

References (13)

Theory of excitonic couplings in dielectric media: Foundation of Poisson-TrEsp method and application to photosystem I trimers Renger, Thomas; Müh, Frank Photosynthesis Research, Vol. 111, Issue 1-2 https://doi.org/10.1007/s11120-011-9685-6	journal	September 2011
The origin of the split B800 absorption peak in the LH2 complexes from Allochromatium vinosum Löhner, Alexander; Carey, Anne-Marie; Hacking, Kirsty Photosynthesis Research, Vol. 123, Issue 1 https://doi.org/10.1007/s11120-014-0036-2	journal	August 2014
Spectroscopic studies of two spectral variants of light-harvesting complex 2 (LH2) from the photosynthetic purple sulfur bacterium Allochromatium vinosum Niedzwiedzki, Dariusz M.; Bina, David; Picken, Nichola Biochimica et Biophysica Acta (BBA) - Bioenergetics, Vol. 1817, Issue 9 https://doi.org/10.1016/j.bbabio.2012.05.009	journal	September 2012
Characterisation of the LH2 spectral variants produced by the photosynthetic purple sulphur bacterium Allochromatium vinosum Carey, Anne-Marie; Hacking, Kirsty; Picken, Nichola Biochimica et Biophysica Acta (BBA) - Bioenergetics, Vol. 1837, Issue 11 https://doi.org/10.1016/j.bbabio.2014.07.022	journal	November 2014
Conformational Complexity in the LH2 Antenna of the Purple Sulfur Bacterium Allochromatium vinosum Revealed by Hole-Burning Spectroscopy Kell, Adam; Jassas, Mahboobe; Acharya, Khem The Journal of Physical Chemistry A, Vol. 121, Issue 23 https://doi.org/10.1021/acs.jpca.7b03188	journal	June 2017
On Light-Induced Photoconversion of B800 Bacteriochlorophylls in the LH2 Antenna of the Purple Sulfur Bacterium Allochromatium vinosum Kell, Adam; Jassas, Mahboobe; Hacking, Kirsty The Journal of Physical Chemistry B, Vol. 121, Issue 43 https://doi.org/10.1021/acs.jpcb.7b06185	journal	October 2017
Origin of the Two Bands in the B800 Ring and Their Involvement in the Energy Transfer Network of Allochromatium vinosum Schröter, Marco; Alcocer, Marcelo J. P.; Cogdell, Richard J. The Journal of Physical Chemistry Letters, Vol. 9, Issue 6 https://doi.org/10.1021/acs.jpclett.8b00438	journal	February 2018
Intra- and Interband Transfers in the B800−B850 Antenna of Rhodospirillum m olischianum : Redfield Theory Modeling of Polarized Pump−Probe Kinetics Novoderezhkin, Vladimir; Wendling, Markus; van Grondelle, Rienk The Journal of Physical Chemistry B, Vol. 107, Issue 41 https://doi.org/10.1021/jp035432l	journal	October 2003
Insight into the Structure of Photosynthetic LH2 Aggregate from Spectroscopy Simulations Rancova, Olga; Sulskus, Juozas; Abramavicius, Darius The Journal of Physical Chemistry B, Vol. 116, Issue 27 https://doi.org/10.1021/jp302817p	journal	June 2012
Calculation of Couplings and Energy-Transfer Pathways between the Pigments of LH2 by the ab Initio Transition Density Cube Method Krueger, Brent P.; Scholes, Gregory D.; Fleming, Graham R. The Journal of Physical Chemistry B, Vol. 102, Issue 27 https://doi.org/10.1021/jp9811171	journal	July 1998
Photosynthetic Light-Harvesting: Reconciling Dynamics and Structure of Purple Bacterial LH2 Reveals Function of Photosynthetic Unit Sundström, Villy; Pullerits, Tõnu; van Grondelle, Rienk The Journal of Physical Chemistry B, Vol. 103, Issue 13 https://doi.org/10.1021/jp983722+	journal	March 1999
Two-dimensional electronic spectroscopy of the B800-B820 light-harvesting complex Zigmantas, D.; Read, E. L.; Mancal, T. Proceedings of the National Academy of Sciences, Vol. 103, Issue 34 https://doi.org/10.1073/pnas.0602961103	journal	August 2006
Coherence in the B800 Ring of Purple Bacteria LH2 Cheng, Y. C.; Silbey, R. J. Physical Review Letters, Vol. 96, Issue 2 https://doi.org/10.1103/PhysRevLett.96.028103	journal	January 2006

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Simulating Fluorescence-Detected Two-Dimensional Electronic Spectroscopy of Multichromophoric Systems Kunsel, Tenzin; Tiwari, Vivek; Matutes, Yassel Acosta The Journal of Physical Chemistry B, Vol. 123, Issue 2 https://doi.org/10.1021/acs.jpcb.8b10176	journal	December 2018

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