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Issue 31, 2016
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The role of alkali metal cations in the stabilization of guanine quadruplexes: why K+ is the best

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Abstract

The alkali metal ion affinity of guanine quadruplexes has been studied using dispersion-corrected density functional theory (DFT-D). We have done computational investigations in aqueous solution that mimics artificial supramolecular conditions where guanine bases assemble into stacked quartets as well as biological environments in which telomeric quadruplexes are formed. In both cases, an alkali metal cation is needed to assist self-assembly. Our quantum chemical computations on these supramolecular systems are able to reproduce the experimental order of affinity of the guanine quadruplexes for the cations Li+, Na+, K+, Rb+, and Cs+. The strongest binding is computed between the potassium cation and the quadruplex as it occurs in nature. The desolvation and the size of alkali metal cations are thought to be responsible for the order of affinity. Until now, the relative importance of these two factors has remained unclear and debated. By assessing the quantum chemical ‘size’ of the cation, determining the amount of deformation of the quadruplex needed to accommodate the cation and through the energy decomposition analysis (EDA) of the interaction energy between the cation and the guanines, we reveal that the desolvation and size of the alkali metal cation are both almost equally responsible for the order of affinity.

Graphical abstract: The role of alkali metal cations in the stabilization of guanine quadruplexes: why K+ is the best

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Publication details

The article was received on 15 Feb 2016, accepted on 03 May 2016 and first published on 03 May 2016


Article type: Paper
DOI: 10.1039/C6CP01030J
Citation: Phys. Chem. Chem. Phys., 2016,18, 20895-20904
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    The role of alkali metal cations in the stabilization of guanine quadruplexes: why K+ is the best

    F. Zaccaria, G. Paragi and C. Fonseca Guerra, Phys. Chem. Chem. Phys., 2016, 18, 20895
    DOI: 10.1039/C6CP01030J

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