Positively Charged Nitrogen is Not Indispensable Requirement for Binding of Nitrogenous κ-Opioid Agonists: Insights from Docking Studies

Title:Positively Charged Nitrogen is Not Indispensable Requirement for Binding of Nitrogenous κ-Opioid Agonists: Insights from Docking Studies

Volume: 11 Issue: 6

Author(s): Indrani Bera and Nanda Ghoshal

Affiliation:

Keywords: Agonist, Docking, Kappa opioid receptor, Non-peptidic, Opioids, Protonated nitrogen.

Abstract: Induced fit docking approach was utilized to decipher the binding mode of the recently reported dibenz[b,f]1,5- oxazocine derivative having activity towards κ -Opioid receptor. The result of docking to newly resolved crystallographic structure of κ -Opioid receptor established the important interactions as two hydrogen bonds, a π-π interaction, and two hydrophobic interactions. Based on the study it is inferred that protonated nitrogen is not always essential for binding of non-peptidic nitrogen containing opioids to κ -Opioid receptor. Also, docking was performed using well-known kappa agonist pentazocine to prove different binding requirements of the dibenzo compound. A pharmacophoric model has been developed based on the previously known nitrogen containing κ -Opioid receptor agonists and the new dibenzo compound to determine the minimal 3D features, required for κ -Opioid agonist activity. To our knowledge, this is the first report of a binding mode analysis study for non-protonated nitrogen containing κ-Opioid receptor agonist.

Cite this article as:

Bera Indrani and Ghoshal Nanda, Positively Charged Nitrogen is Not Indispensable Requirement for Binding of Nitrogenous κ-Opioid Agonists: Insights from Docking Studies, Letters in Drug Design & Discovery 2014; 11(6) . https://dx.doi.org/10.2174/1570180811666140220004853