Abstract
The effects of the interaction of the monovalent (Li+, Na+, K+) and divalent (Mg2+) counterions hexahydrated (6H2O), with the PO2− group, on the geometrical and vibrational characteristics of 3', 5'-dDCMP, were studied using the DFT/B3LYP/6-31++G(d) method. These calculations were performed using the explicit (6H2O) and hybrid (6H2O/Continuum) solvation models. The optimizations reveal that in the conformation g−g− and in the explicit model of solvation, the small ions (Li+, Na+) deviate from the bisector plane of the angle O1-P-O2 and the large ions (K+ and Mg2+) remain in this plane, whereas in the hybrid model of solvation, the counterions deviate from this plane. However, when the conformer is g+g+, the monovalent counterions deviate and divide the remainder of the plane regardless of the type of solvation model. In addition, the g−g− conformer is the most stable in the presence of the explicit solvent, while the g+g+ conformer is the most stable in the presence of the hybrid solvent. Finally, the normal modes of the conformers g−g− and g+g+ in the presence of the counterions in the hybrid model show a better agreement with the available experimental data of the DNA forms A, B (g−g−), and Z (g+g+) relatively to the explicit model. This very good agreement is illustrated by the very small deviations ≤ 0.08% (g−g−) and ≤ 0.41% (g+g+) observed between the calculated and experimental data for the PO2− (asymmetric) stretching mode in the presence of the counterion K+ in the hybrid model.
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The authors are grateful to the Higher Teachers’ Training College Maroua (University of Maroua) for their support to this project.
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Minguirbara, A., Vamhindi, B.D.R., Koyambo-Konzapa, S.J. et al. Effects of counterions and solvents on the geometrical and vibrational features of dinucleoside-monophosphate (dNMP): case of 3',5'-dideoxycytidine-monophosphate (dDCMP). J Mol Model 26, 99 (2020). https://doi.org/10.1007/s00894-020-04369-6
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DOI: https://doi.org/10.1007/s00894-020-04369-6