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- W2083178995 endingPage "11867" @default.
- W2083178995 startingPage "11867" @default.
- W2083178995 abstract "We combine ONIOM simulations with an elaborated hydrated DNA model to evaluate the effects of the hydroxyl radical, one of the major products in irradiated cells, on the stability of the guanine–cytosine (G:C) base pair. Our results demonstrate that the addition of the hydroxyl radical to the cytosine moiety results in inter-base hydrogen bonds rearrangements, eventually leading to a so-called rare tautomeric isomer. In these processes, the O6(G)–N4(C) hydrogen bond strength plays a crucial role as one of the driving forces for the double proton transfer. We also demonstrate that the surrounding environment affects the stability of the non-canonical mutagenic forms. As in undamaged DNA, the water molecules of the first hydration shell might catalyze the exchange of protons while π-stacking tunes the energetic profile of the reaction. The degenerative effects of the induced rare tautomers are shown to be governed by the transition states along the PT reactions, which in turn determines their lifetimes." @default.
- W2083178995 created "2016-06-24" @default.
- W2083178995 creator A5020352602 @default.
- W2083178995 creator A5085758528 @default.
- W2083178995 date "2012-01-01" @default.
- W2083178995 modified "2023-10-06" @default.
- W2083178995 title "Interplay between hydroxyl radical attack and H-bond stability in guanine–cytosine" @default.
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