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Lookup NU author(s): Dr Daniel Cole
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Collective protein modes are expected to be important for facilitating energy transfer in the Fenna-Matthews-Olson (FMO) complex of photosynthetic green sulphur bacteria, however to date little work has focussed on the microscopic details of these vibrations. The nonlinear network model (NNM) provides a computationally inexpensive approach to studying vibrational modes at the microscopic level in large protein structures, whilst incorporating anharmonicity in the inter-residue interactions which can influence protein dynamics. We apply the NNM to the entire trimeric FMO complex and find evidence for the existence of nonlinear discrete breather modes. These modes tend to transfer energy to the highly connected core pigments, potentially opening up alternative excitation energy transfer routes through their influence on pigment properties. Incorporating localised modes based on these discrete breathers in the optical spectra calculations for FMO using ab initio site energies and excitonic couplings can substantially improve their agreement with experimental results.
Author(s): Morgan SE, Cole DJ, Chin AW
Publication type: Article
Publication status: Published
Journal: Scientific Reports
Online publication date: 09/11/2016
Acceptance date: 19/10/2016
Date deposited: 20/10/2016
ISSN (electronic): 2045-2322
Publisher: Nature Publishing Group
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