Molecular basis of ligand dissociation in β-adrenergic receptors

Angel González, Tomas Perez-Acle, Leonardo Pardo, Xavier Deupi

Research output: Contribution to journalArticleResearchpeer-review

66 Citations (Scopus)

Abstract

The important and diverse biological functions of β-adrenergic receptors (βARs) have promoted the search for compounds to stimulate or inhibit their activity. In this regard, unraveling the molecular basis of ligand binding/unbinding events is essential to understand the pharmacological properties of these G protein-coupled receptors. In this study, we use the steered molecular dynamics simulation method to describe, in atomic detail, the unbinding process of two inverse agonists, which have been recently co-crystallized with β 1 and β 2ARs subtypes, along four different channels. Our results indicate that this type of compounds likely accesses the orthosteric binding site of βARs from the extracellular water environment. Importantly, reconstruction of forces and energies from the simulations of the dissociation process suggests, for the first time, the presence of secondary binding sites located in the extracellular loops 2 and 3 and transmembrane helix 7, where ligands are transiently retained by electrostatic and Van der Waals interactions. Comparison of the residues that form these new transient allosteric binding sites in both βARs subtypes reveals the importance of non-conserved electrostatic interactions as well as conserved aromatic contacts in the early steps of the binding process. © 2011 González et al.
Original languageEnglish
Article numbere23815
JournalPLoS ONE
Volume6
DOIs
Publication statusPublished - 13 Sep 2011

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