Unravelling the interaction of pirenzepine, a gastrointestinal disorder drug, with calf thymus DNA: An in vitro and molecular modelling study.

Pirenzepine is an anti-ulcer agent which belongs to the anti-cholinergic group of gastrointestinal disorder drugs and functions as an M1 receptor selective antagonist. Drug-DNA interaction studies are of great significance as it helps in the development of new therapeutic drugs. It provides a deeper understanding into the mechanism through which therapeutic drugs control gene expression. Interaction of pirenzepine with calf-thymus DNA (Ct-DNA) was determined via a series of biophysical techniques. UV-visible absorption and fluorescence spectroscopy confirmed the formation of pirenzepine-Ct-DNA complex. The values of binding constant from various experiments were calculated to be in the order of 103 M-1 which is consistent with the groove binding mode. Various spectrofluorimetric experiments like competitive displacement of well known dyes with drug, iodide quenching experiments and the effect of Ct-DNA denaturation in presence of drug confirmed the binding of pirenzepine to the groove of Ct-DNA. The binding mode was further established by viscometric, circular dichroic and molecular modelling studies. Thermodynamic parameters obtained from isothermal titration calorimetric studies suggest that the interaction of pirenzepine with Ct-DNA is enthalpically driven. The value of TΔS and ΔH calculated from calorimetric studies were found to be 4.3 kcal mol-1 and -2.54 kcal mol-1 respectively, indicating that pirenzepine-Ct-DNA complex is mainly stabilized by hydrophobic interaction and hydrogen bonding. The binding energy calculated was -7.5 kcal mol-1 from modelling studies which was approximately similar to that obtained by isothermal titration calorimetric studies. Moreover, the role of electrostatic interaction in the binding of pirenzepine to Ct-DNA cannot be precluded.