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Non-canonical DNA structures: Comparative quantum mechanical study
Stanislav S Bachurin1, Mikhail E Kletskii2, Oleg N Burov2
1FSBEI HE Rostov State Medical University of Ministry of Health of the Russian Federation, 29 Nakhichevansky st., Rostov-on-Don 344022, Russia.
Biophysical Chemistry
|February 13, 2018
Summary
This study reveals non-canonical DNA structures (NSs) are energetically favorable, especially in combination. These supramolecular complexes show promise as novel drug targets for gene regulation and cancer therapy.
Area of Science:
- Molecular Biology
- Computational Chemistry
- Biophysics
Background:
- Non-canonical DNA structures (NSs) like triplexes, G-quadruplexes, and i-motifs play crucial roles in cellular processes.
- Understanding their thermodynamic stability is key to exploring their biological functions and therapeutic potential.
Purpose of the Study:
- To investigate the relative thermodynamic stability of various non-canonical DNA structures.
- To explore the energetic favorability of combined NSs compared to individual bases.
- To evaluate NSs as potential targets for gene regulation and therapeutic interventions.
Main Methods:
- Utilized quantum chemical Density Functional Theory (DFT) with the B3LYP/6-31++G(d) level of theory for calculations.
- Compared calculated stability data with experimental results for G-quadruplexes against Watson-Crick B-DNA.
Main Results:
- Calculations accurately reproduced experimental data on G-quadruplex stability relative to B-DNA.
- Combinations of non-canonical DNA structures were found to be energetically more favorable than individual nitrogenous bases.
- Supramolecular complexes of NSs demonstrated significant energetic advantages.
Conclusions:
- Non-canonical DNA structures, particularly in supramolecular complexes, offer a promising avenue for biological drug targets.
- These findings support the potential of NSs in gene regulation strategies, including applications in tumor therapy.
- The study highlights the importance of considering combined NSs for therapeutic development.
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