The key to the yellow-to-cyan tuning in the green fluorescent protein family is polarisation.

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ID: 27378
2019
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Ranked #97 of 184 articles by views in Physical chemistry chemical physics : PCCP

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Abstract
Computational approaches have to date failed to fully capture the large (about 0.4 eV) excitation energy tuning displayed by the nearly identical anionic chromophore in different green fluorescent protein (GFP) variants. Here, we present a thorough comparative study of a set of proteins in this sub-family, including the most red- (phiYFP) and blue-shifted (mTFP0.7) ones. We employ a classical polarisable embedding through induced dipoles and combine it with time-dependent density functional theory and multireference perturbation theory in order to capture both state-specific induction contributions and the coupling of the polarisation of the protein to the chromophore transition density. The obtained results show that only upon inclusion of both these two effects generated by the mutual polarisation between the chromophore and the protein can the full spectral tuning be replicated. We finally discuss how this mutual polarisation affects the correlation between excitation energies, dipole moment variation, and molecular electrostatic field.
Reference Key
nifos2019thephysical Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Nifosì, Riccardo;Mennucci, Benedetta;Filippi, Claudia;
Journal Physical chemistry chemical physics : PCCP
Year 2019
DOI
10.1039/c9cp03722e
URL
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