Single-molecule analysis of ligand efficacy in β 2 AR-G-protein activation

Nature. 2017 Jul 6;547(7661):68-73. doi: 10.1038/nature22354. Epub 2017 Jun 7.

Abstract

G-protein-coupled receptor (GPCR)-mediated signal transduction is central to human physiology and disease intervention, yet the molecular mechanisms responsible for ligand-dependent signalling responses remain poorly understood. In class A GPCRs, receptor activation and G-protein coupling entail outward movements of transmembrane helix 6 (TM6). Here, using single-molecule fluorescence resonance energy transfer imaging, we examine TM6 movements in the β2 adrenergic receptor (β2AR) upon exposure to orthosteric ligands with different efficacies, in the absence and presence of the Gs heterotrimer. We show that partial and full agonists differentially affect TM6 motions to regulate the rate at which GDP-bound β2AR-Gs complexes are formed and the efficiency of nucleotide exchange leading to Gs activation. These data also reveal transient nucleotide-bound β2AR-Gs species that are distinct from known structures, and provide single-molecule perspectives on the allosteric link between ligand- and nucleotide-binding pockets that shed new light on the G-protein activation mechanism.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Adrenergic beta-2 Receptor Agonists / chemistry
  • Adrenergic beta-2 Receptor Agonists / metabolism
  • Adrenergic beta-2 Receptor Agonists / pharmacology
  • Allosteric Site
  • Cell Membrane / metabolism
  • Clenbuterol / chemistry
  • Clenbuterol / metabolism
  • Clenbuterol / pharmacology
  • Enzyme Activation / drug effects
  • Epinephrine / chemistry
  • Epinephrine / metabolism
  • Epinephrine / pharmacology
  • Fluorescence Resonance Energy Transfer
  • GTP-Binding Protein alpha Subunits, Gs / chemistry
  • GTP-Binding Protein alpha Subunits, Gs / metabolism*
  • Guanosine Diphosphate / metabolism
  • Humans
  • Kinetics
  • Ligands
  • Models, Molecular
  • Movement / drug effects
  • Protein Stability
  • Receptors, Adrenergic, beta-2 / chemistry
  • Receptors, Adrenergic, beta-2 / metabolism*
  • Single Molecule Imaging*

Substances

  • Adrenergic beta-2 Receptor Agonists
  • Ligands
  • Receptors, Adrenergic, beta-2
  • Guanosine Diphosphate
  • GTP-Binding Protein alpha Subunits, Gs
  • Clenbuterol
  • Epinephrine