Jump to main content
Jump to site search


Interaction of indomethacin with calf thymus DNA: a multi-spectroscopic, thermodynamic and molecular modelling approach

Author affiliations

Abstract

Indomethacin belongs to the acetic acid derivative class of non-steroidal anti-inflammatory drugs with diverse pharmacological and biological activities. Understanding the mechanism of interaction of drugs with possible target and off-target biomolecules can prove useful in the development of a rational drug designing system. In this paper, we have attempted to ascertain the mode of binding of indomethacin with calf thymus DNA (Ct-DNA) through various biophysical techniques and in silico molecular docking. Analysis of the UV-visible absorbance spectra and fluorescence emission profile of indomethacin upon addition of Ct-DNA indicates the formation of a drug–DNA complex. UV-visible absorbance and steady state fluorescence experiments revealed a binding constant on the order of 103 L mol−1, which is consistent with those of well-known groove binders. Competitive displacement studies with ethidium bromide, acridine orange and Hoechst 33258 further suggested that indomethacin binds to the minor groove of the Ct-DNA. The above observations were further confirmed by KI induced quenching experiments, DNA melting studies, CD spectral analysis and viscosity measurements. The thermodynamic parameters like spontaneous free energy (ΔG < 0) and large favourable enthalpy (ΔH < 0) obtained from isothermal calorimetry indicated the involvement of hydrogen bonding and van der Waals forces in the binding process. Molecular docking further corroborated the experimental results.

Graphical abstract: Interaction of indomethacin with calf thymus DNA: a multi-spectroscopic, thermodynamic and molecular modelling approach

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 24 Feb 2017, accepted on 26 Apr 2017 and first published on 27 Apr 2017


Article type: Research Article
DOI: 10.1039/C7MD00094D
Citation: Med. Chem. Commun., 2017, Advance Article
  •   Request permissions

    Interaction of indomethacin with calf thymus DNA: a multi-spectroscopic, thermodynamic and molecular modelling approach

    M. A. Husain, H. M. Ishqi, T. Sarwar, S. U. Rehman and M. Tabish, Med. Chem. Commun., 2017, Advance Article , DOI: 10.1039/C7MD00094D

Search articles by author