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Modeling of various optical spectra in the presence of slow excitation energy transfer in dimers and trimers with weak interpigment coupling: FMO as an example.

Author(s): Herascu N, Kell A, Acharya K, Jankowiak R, Blankenship RE, Zazubovich V

J Phys Chem B. 2014 Feb 27;118(8):2032-40 Authors: Herascu N, Kell A, Acharya K, Jankowiak R, Blankenship RE, Zazubovich V

Article GUID: 24506338
On the Controversial Nature of the 825 nm Exciton Band in the FMO Protein Complex.

Author(s): Kell A, Acharya K, Zazubovich V, Jankowiak R

J Phys Chem Lett. 2014 Apr 17;5(8):1450-6 Authors: Kell A, Acharya K, Zazubovich V, Jankowiak R

Article GUID: 26269993
On the Conflicting Estimations of Pigment Site Energies in Photosynthetic Complexes: A Case Study of the CP47 Complex.

Author(s): Reinot T, Chen J, Kell A, Jassas M, Robben KC, Zazubovich V, Jankowiak R

Anal Chem Insights. 2016;11:35-48 Authors: Reinot T, Chen J, Kell A, Jassas M, Robben KC, Zazubovich V, Jankowiak R

Article GUID: 27279733
Title:On the Controversial Nature of the 825 nm Exciton Band in the FMO Protein Complex.
Authors:Kell A,  Acharya K,  Zazubovich V,  Jankowiak R
Link:https://www.ncbi.nlm.nih.gov/pubmed/26269993?dopt=Abstract
Category:J Phys Chem Lett
PMID:26269993
Dept Affiliation: PHYSICS
1 §Department of Physics, Concordia University, Montreal H4B 1R6, Quebec, Canada.

Description:

On the Controversial Nature of the 825 nm Exciton Band in the FMO Protein Complex.

J Phys Chem Lett. 2014 Apr 17;5(8):1450-6

Authors: Kell A, Acharya K, Zazubovich V, Jankowiak R

Abstract

The nature of the low-energy 825 nm band of the Fenna-Matthews-Olson (FMO) protein complex from Chlorobaculum tepidum at 5 K is discussed. It is shown, using hole-burning (HB) spectroscopy and excitonic calculations, that the 825 nm absorption band of the FMO trimer cannot be explained by a single electronic transition or overlap of electronic transitions of noninteracting pigments. To explain the shape of emission and nonresonant HB spectra, downward uncorrelated excitation energy transfer (EET) between trimer subunits should be taken into account. Modeling studies reveal the presence of three sub-bands within the 825 nm band, in agreement with nonresonant HB and emission spectra. We argue that after light induced coherences vanish, uncorrelated EET between the lowest exciton levels of each monomer takes place. HB induced spectral shifts provide a new insight on the energy landscape of the FMO protein.

PMID: 26269993 [PubMed]