Abstract
To elucidate details of the DNA-water interactions we performed the calculations and systematic search for minima of interaction energy of the systems consisting of one of DNA bases and one or two water molecules. The results of calculations using two force fields of molecular mechanics (MM) and correlated ab initio method MP2/6-31G(d, p) of quantum mechanics (QM) have been compared with one another and with experimental data. The calculations demonstrated a qualitative agreement between geometry characteristics of the most of local energy minima obtained via different methods. The deepest minima revealed by MM and QM methods correspond to water molecule position between two neighbor hydrophilic centers of the base and to the formation by water molecule of hydrogen bonds with them. Nevertheless, the relative depth of some minima and peculiarities of mutual water-base positions in these minima depend on the method used. The analysis revealed insignificance of some differences in the results of calculations performed via different methods and the importance of other ones for the description of DNA hydration. The calculations via MM methods enable us to reproduce quantitatively all the experimental data on the enthalpies of complex formation of single water molecule with the set of mono-, di-, and trimethylated bases, as well as on water molecule locations near base hydrophilic atoms in the crystals of DNA duplex fragments, while some of these data cannot be rationalized by QM calculations.
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Original Russian Text © E. González, J. Lino, A. Deriabina, J.N.F. Herrera, V.I. Poltev, 2013, published in Biofizika, 2013, Vol. 58, No. 5, pp. 748–757.
Editor’s Note: This is a closest equivalent of the original publication with all its practical details, statements and terminology, phrasing and style; English title and Abstract provided by authors. A.G.
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González, E., Lino, J., Deriabina, A. et al. Interactions of DNA bases with individual water molecules. Molecular mechanics and quantum mechanics computation results vs. experimental data. BIOPHYSICS 58, 583–591 (2013). https://doi.org/10.1134/S0006350913050047
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DOI: https://doi.org/10.1134/S0006350913050047