Cryo-EM structures of the β3 adrenergic receptor bound to solabegron and isoproterenol

Biochem Biophys Res Commun. 2022 Jun 30:611:158-164. doi: 10.1016/j.bbrc.2022.04.065. Epub 2022 Apr 19.

Abstract

The β3-adrenergic receptor (β3AR) is the most essential drug target for overactive bladder and has therapeutic potentials for the treatments of type 2 diabetes and obesity. Here, we report the cryo-electron microscopy structures of the β3AR-Gs signaling complexes with the selective agonist, solabegron and the nonselective agonist, isoproterenol. Comparison of the isoproterenol-, mirabegron-, and solabegron-bound β3AR structures revealed that the extracellular loop 2 changes its conformation depending on the bound agonist and plays an essential role in solabegron binding. Moreover, β3AR has an intrinsically narrow exosite, regardless of the agonist type. This structural feature clearly explains why β3AR prefers mirabegron and solabegron, as the narrow exosite is suitable for binding with agonists with elongated shapes. Our study deepens the understanding of the binding characteristics of β3AR agonists and may pave the way for developing β3AR-selective drugs.

Keywords: GPCR; Ligand recognition; adrenergic receptor; cryo-EM.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adrenergic beta-3 Receptor Agonists* / pharmacology
  • Aniline Compounds
  • Benzoates
  • Biphenyl Compounds
  • Cryoelectron Microscopy
  • Diabetes Mellitus, Type 2* / drug therapy
  • Humans
  • Isoproterenol / pharmacology
  • Receptors, Adrenergic, beta-3 / metabolism

Substances

  • Adrenergic beta-3 Receptor Agonists
  • Aniline Compounds
  • Benzoates
  • Biphenyl Compounds
  • Receptors, Adrenergic, beta-3
  • solabegron
  • Isoproterenol