Abstract
In this chapter we analyze and systematize the data related to intramolecular hydrogen bonds and their impact on molecular geometry of nucleotides. The application of various non-empirical methods of quantum chemistry to determination of conformational characteristics of anions of the canonical 2′-deoxyribonucleotides and their methyl esters, as well as their energetics, is discussed. We revealed an existence of novel intramolecular interactions of the canonical 2′-deoxyribonucleotide anions. They are caused by incorporation of 2′-deoxyribonucleotide anions into DNA as well as by the impact of the nucleobases on the conformational features of the nucleotides and intramolecular interactions of these molecules. The efficient strategy of the evaluation of proton affinity for the different types of nucleotides is described. It is based on the analysis of consequences of nucleobases protonation along with the details of intramolecular interactions in 2′-deoxyribonucleotide anions. The results of our molecular simulations cast light on relationship between the conformational dynamics of a molecule and the tautomeric transitions in the components of nucleotides.
To the memory of Dr. Oleg Shishkin, our friend and colleague, for all inspiration he had continuously provided.
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Acknowledgments
The authors thank the National Science Foundation for financial support through NSF/CREST Award (HRD-0833178). This research was supported in part by the Extreme Science and Engineering Discovery Environment (XSEDE) by National Science Foundation grant number OCI-1053575 and XSEDE award allocation number DMR110088. Authors thank to the Mississippi Center for Supercomputer Research (Oxford, MS) for the generous allotment of computer time. The support from computational facilities of joint computational cluster of SSI “Institute for Single Crystals” and Institute for Scintillation Materials of National Academy of Science of Ukraine incorporated into Ukrainian National Grid is gratefully acknowledged.
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Zubatiuk, T., Palamarchuk, G., Shishkin, O., Gorb, L., Leszczynski, J. (2014). Molecular Structures, Relative Stability, and Proton Affinities of Nucleotides: Broad View and Novel Findings. In: Gorb, L., Kuz'min, V., Muratov, E. (eds) Application of Computational Techniques in Pharmacy and Medicine. Challenges and Advances in Computational Chemistry and Physics, vol 17. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-9257-8_5
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