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The Influence of Sugar-Phosphate Backbone on the Stacking Interaction in B-DNA Helix Formation


Affiliations
1 Indian Institute of Science Education and Research Mohali, Manauli 140 306, India
2 Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, India
 

The influence of sugar-phosphate backbone on the stacking interaction in the adenine…thymine base-pair dimer (A…T)2 has been studied using the density functional theoretic method and the dispersion-corrected density functional BLYP-D3 and the triple-zeta quality basis set def2-TZVP. In the absence of the sugar-phosphate backbone, several stacked conform-ers were obtained with a small difference in their stabilization energy values (-20 to -25 kcal/mol). However, the presence of the sugar-phosphate back-bone limits the movement of the two A…T units, and yet the stacking interaction remains significant (-19.4 kcal/mol). Despite the constraints imposed by the backbone, the dimer (A…T)2 is found to retain its favourable geometry. The influence of sodium ions on the geometry and the interaction energy is found to be negligible.

Keywords

B-DNA Helix Formation, BLYP-D3, Stacking Interaction, Sugar–Phosphate Backbone.
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  • The Influence of Sugar-Phosphate Backbone on the Stacking Interaction in B-DNA Helix Formation

Abstract Views: 469  |  PDF Views: 125

Authors

Sumit Mittal
Indian Institute of Science Education and Research Mohali, Manauli 140 306, India
Brijesh Kumar Mishra
Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, India
N. Sathyamurthy
Indian Institute of Science Education and Research Mohali, Manauli 140 306, India

Abstract


The influence of sugar-phosphate backbone on the stacking interaction in the adenine…thymine base-pair dimer (A…T)2 has been studied using the density functional theoretic method and the dispersion-corrected density functional BLYP-D3 and the triple-zeta quality basis set def2-TZVP. In the absence of the sugar-phosphate backbone, several stacked conform-ers were obtained with a small difference in their stabilization energy values (-20 to -25 kcal/mol). However, the presence of the sugar-phosphate back-bone limits the movement of the two A…T units, and yet the stacking interaction remains significant (-19.4 kcal/mol). Despite the constraints imposed by the backbone, the dimer (A…T)2 is found to retain its favourable geometry. The influence of sodium ions on the geometry and the interaction energy is found to be negligible.

Keywords


B-DNA Helix Formation, BLYP-D3, Stacking Interaction, Sugar–Phosphate Backbone.



DOI: https://doi.org/10.18520/cs%2Fv108%2Fi6%2F1126-1131