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Combinatorial Chemistry & High Throughput Screening

Editor-in-Chief

ISSN (Print): 1386-2073
ISSN (Online): 1875-5402

Research Article

The Effect of Temperature on the Interaction of Phenanthroline-based Ligands with G-quadruplex: In Silico Viewpoint

Author(s): Mohadeseh Bazoobandi, Mohammad R. Bozorgmehr*, Ali Mahmoudi and Ali Morsali

Volume 22, Issue 8, 2019

Page: [546 - 554] Pages: 9

DOI: 10.2174/1386207322666191022142629

Price: $65

Abstract

Aim and Objective: The stability of the G-quadruplex structure can increase its activity in telomerase inhibiting cancer cells. In this study, a molecular dynamics simulation method was used to study the effect of three phenanthroline-based ligands on the structure of G-quadruplex at the temperatures of 20, 40, 60 and 80°C.

Materials and Methods: RMSD values and frequency of calculated RMSD in the presence and absence of ligands show that ligands cause the relative stability of the G-quadruplex, particularly at low temperatures. The calculation of hydrogen bonds in Guanine-tetrads in three different quadruplex sheets shows that the effect of ligands on the sheets is not the same so that the bottom sheet of G-quadruplex is most affected by the ligands at high temperatures, and the Guaninetetrads in this sheet are far away. Conformation factor was calculated as a measure of ligands binding affinity for each of the G-quadruplex residues.

Results: The results show that the studied ligands interact more with the G-quadruplex than loop areas, although with increasing temperature, the binding area also includes the G-quadruplex sheets. The contribution of each of the residues involved in the G-quadruplex binding area with ligands was also calculated.

Conclusion: The calculations performed are consistent with the previous experimental observations that can help to understand the molecular mechanism of the interaction of phenanthroline and its derivatives with quadruplex.

Keywords: Phenanthroline, quadruplex, affinity, conformation factor, molecular mechanism, cancer cells.

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