Ukr.Biochem.J. 2013; Volume 85, Issue 4, Jul-Aug, pp. 98-103

doi: http://dx.doi.org/10.15407/ubj85.04.098

Under what conditions does G•C watson-crick DNA base pair acquire all four configurations characteristic for A•T watson-crick DNA base pair?

O. O. Brovarets’

Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine, Kyiv;
Research and Educational Center “State Key Laboratory of Molecular and Cell Biology”, Kyiv, Ukraine;
Institute of High Technologies, Taras Shevchenko National University of Kyiv, Ukraine;
e-mail: brovarets@list.ru

At the MP2/6-311++G(2df,pd)//B3LYP/6-311++G(d,p) level of theory it was established for the first time, that the Löwdin’s G*·C* DNA base pair formed by the mutagenic tautomers can acquire, as the A·T Watson-Crick DNA base pair, four biologically important configurations, namely: Watson-Crick, reverse Watson-Crick, Hoogsteen and reverse Hoogsteen. This fact demonstrates rather unexpected role of the tautomerisation of the one of the Watson-Crick DNA base pairs, in particular, via double proton transfer: exactly the G·C→G*·C* tautomerisation allows to overcome steric hindrances for the implementation of the above mentioned configurations. Geometric, electron-topological and energetic properties of the H-bonds that stabilise the studied pairs, as well as the energetic characteristics of the latters are presented.

Keywords: , , , ,


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