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Dynamic mechanism for subtype selectivity of endocannabinoids.

Soumajit Dutta1, Lawrence Zhao2, Diwakar Shukla3

  • 1Department of Chemical and Biomolecular Engineering, University of Illinois at, Urbana-Champaign, Urbana, Illinois, USA.

The Journal of Biological Chemistry
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Summary

Endocannabinoid selectivity for CB1 receptors arises from distinct ligand-protein interactions and binding pocket dynamics. This research explains anandamide

Keywords:
VAMPnets subtype selectivityallosteric binding siteanandamidecannabinoid receptorsg-protein-coupled receptormarkov state modelmolecular dynamicsrelative binding free energy calculation

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Area of Science:

  • Biophysics
  • Computational Chemistry
  • Pharmacology

Background:

  • Endocannabinoids regulate bodily functions via the endocannabinoid system.
  • Developing selective cannabinoid receptor (CB) drugs is a major interest.
  • Biophysical mechanisms of endocannabinoid subtype selectivity remain unclear.

Purpose of the Study:

  • To elucidate the biophysical mechanisms behind anandamide selectivity for the CB1 receptor.
  • To test hypotheses involving enthalpic interactions and volumetric differences in binding pockets.
  • To characterize the anandamide binding process using advanced computational methods.

Main Methods:

  • Extensive molecular dynamics simulations (∼0.9 milliseconds).
  • Markov state modeling and deep learning-based VAMPnets.
  • Relative free energy calculations for anandamide analogs.

Main Results:

  • Distinct N-terminus positions influence anandamide binding mechanisms and interactions.
  • CB2 receptor's larger pocket volume increases entropic effects.
  • CB1 selectivity is driven by dominant enthalpy contributions from ligand-protein interactions.

Conclusions:

  • Opposing enthalpy and entropy effects shape endocannabinoid selectivity.
  • Anandamide's CB1 selectivity is explained by favorable enthalpic interactions.
  • Findings aid in the discovery of novel CB selective drugs.