Frequency and effect of the binding of Mg2+, Mn2+, and Co2+ ions on the guanine base in Watson-Crick and reverse Watson-Crick base pairs

The Journal of Physical Chemistry. B
Romina Oliva, Luigi Cavallo

Abstract

We performed MP2 calculations to elucidate the structure and energetics of the Mg(2+), Mn(2+), and Co(2+) hexahydrated aquaions, and the effect of the metal binding to the N7 atom of (i) a single guanine, (ii) a guanine involved in a Watson-Crick pair, and (iii) a guanine involved in a reverse Watson-Crick base pair. Our comparative analysis of the three aquaions indicates a clear inverse correlation between the radius of the cation and the binding energy, that indeed increases in the order Mn(2+) < Co(2+) < Mg(2+). The trend in the binding energies of the pentahydrated cations to the N7 atom of the guanine is instead Mg(2+) < Mn(2+) < Co(2+), suggesting a rather different bonding scheme that, for the two transition metals, involves back-donation from the aromatic ring of the guanine to their empty d orbitals. In the gas phase, the three hydrated metals significantly stabilize both G-C base pair geometries, Watson-Crick and reverse Watson-Crick, we investigated. Inclusion of a continuous solvent model, however, remarkably reduces this additional stabilization, which becomes almost negligible in the case of the Mg(2+) cation coordinated to the guanine in the standard Watson-Crick geometry. Conversely, all three metal ions sensib...Continue Reading

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Citations

Feb 5, 2015·Biophysical Journal·Kathryn D MouzakisSamuel E Butcher
Sep 29, 2011·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·José P Cerón-Carrasco, Denis Jacquemin
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Sep 18, 2020·Journal of Chemical Theory and Computation·Antarip HalderGovardhan Reddy

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