Impact of temperature on the binding interaction between dsDNA and curcumin: An electrochemical study

Abstract

In this study, we investigated the binding mode between double-stranded deoxyribonucleic acid (dsDNA) and curcumin (CU) using differential pulse voltammetry (DPV), UV-Vis spectroscopy, and molecular docking. By employing these techniques, we predicted the binding within the minor groove region of dsDNA and CU. Significantly, we employed electrochemistry, specifically cyclic voltammetry (CV), to explore the temperature effect on the dsDNA and CU binding. To the best of our knowledge, this is the first study to utilize electrochemical methods for investigating the temperature-dependent behavior of this binding interaction. Our findings revealed temperature-dependent variations in the binding constants: 2.42 × 10³ M^-1 at 25 °C, 4.26 × 10³ M^-1 at 30 °C, 5.44 × 10³ M^-1 at 35 °C, 6.29 × 10³ M^-1 at 40 °C, and 7.52 × 10³ M^-1 at 45 °C. Notably, the binding constant exhibited an increasing trend with elevated temperatures, indicating a temperature-dependent enhancement of the binding interaction.

Keywords: Curcumin; Double-stranded DNA; Electrochemistry; Temperature-dependent binding; Thermotherapy.