Abstract
This work deals with the interaction between urea and DNA bases (adenine, thymine, guanine, and cytosine). The optimized geometries, binding energies, and harmonic vibrational frequencies are calculated using the DFT/B3LYP functional combined with the 6–31+G(d,p) basis set. Their interactions are studied aiming to understand more about the nature of the intercalation binding forces between urea and DNA. Fourteen stable complexes are found on the potential energy surface. The structures are cyclic; they are stabilized by NH...O/N and CH...O interactions. The binding energies range from −19.9 kJ·mol−1 to −74.0 kJ·mol−1. The obtained formation energies indicate that Urea:G and Urea:C are more favorable than Urea:T and Urea:A. In addition, the Atoms in Molecules theory is performed to study the hydrogen bonds in the complexes.
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Original Russian Text Copyright © 2011 by Z. Qiu, Yo. xia, H. Wang, and K. Diao
The text was submitted by the authors in English. Zhurnal Strukturnoi Khimii, Vol. 52, No. 3, pp. 478–486, May–June, 2011.
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Qiu, Z., Xia, Y., Wang, H. et al. Hydrogen-bonding interaction of urea with DNA bases: A density functional theory study. J Struct Chem 52, 462–470 (2011). https://doi.org/10.1134/S0022476611030036
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DOI: https://doi.org/10.1134/S0022476611030036