Solvent effect on the energetics of proton coupled electron transfer in guanine-cytosine pair in chloroform by mixed explicit and implicit solvation models

Lara Martinez-Fernandez 1 Giacomo Prampolini 2 Javier Cerezo 3 Yanli Liu 4 Fabrizio Santoro 2 Roberto Improta 1
1 DICO - Biomolécules Excitées
IRAMIS - Institut Rayonnement Matière de Saclay, LIDyl - Laboratoire Interactions, Dynamique et Lasers (ex SPAM)
2 ICCOM-CNR - ICCOM
3 Universidad de Murcia
4 School of Physics and Optoelectronics Engineering
Abstract : The Watson-Crick hydrogen bonded pair formed by deoxyguanosine and deoxycytidine (GC) in chloroform has been analysed by classical Molecular Dynamics simulations, which shows the existence of several fairly stable solute/solvent hydrogen bonds. Time-Dependent Density Functional Theory (TD-DFT) calculations with M052X functional, including solvation effect by a mixed continuum/discrete model, show that solvent stabilizes G → C Charge Transfer excited states (CTGC). The Proton Transfer (PT) processes that can occur in CTGC have been mapped by TD-DFT combining State Specific and Linear Response implementations of the Polarizable Continuum Model. For the first time, the effect of explicit solute/solvent interactions on the PT is considered by studying models containing up to three CHCl3 molecules. Our study shows that PT from the N1 atom of G to the N3 of C is exoergonic also in solution but, at variance with what observed in gas-phase, a stable minimum is predicted for CTGC state in chloroform.
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Journal articles
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https://hal-cea.archives-ouvertes.fr/cea-01978120
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Submitted on : Friday, January 11, 2019 - 12:11:46 PM
Last modification on : Wednesday, March 20, 2019 - 2:35:31 PM

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CEA | DSM-IRAMIS | CEA-UPSAY | IRAMIS-LIDYL | CEA-DRF | UNIV-PARIS-SACLAY

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Lara Martinez-Fernandez, Giacomo Prampolini, Javier Cerezo, Yanli Liu, Fabrizio Santoro, et al.. Solvent effect on the energetics of proton coupled electron transfer in guanine-cytosine pair in chloroform by mixed explicit and implicit solvation models. Chemical Physics, Elsevier, 2018, 515, pp.493-501. ⟨10.1016/j.chemphys.2018.07.012⟩. ⟨cea-01978120⟩

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