Journal: Mol Cell / Year: 2021 Title: Cryo-EM structure of the β3-adrenergic receptor reveals the molecular basis of subtype selectivity. Authors: Chisae Nagiri / Kazuhiro Kobayashi / Atsuhiro Tomita / Masahiko Kato / Kan Kobayashi / Keitaro Yamashita / Tomohiro Nishizawa / Asuka Inoue / Wataru Shihoya / Osamu Nureki / Abstract: The β-adrenergic receptor (βAR) is predominantly expressed in adipose tissue and urinary bladder and has emerged as an attractive drug target for the treatment of type 2 diabetes, obesity, and ...The β-adrenergic receptor (βAR) is predominantly expressed in adipose tissue and urinary bladder and has emerged as an attractive drug target for the treatment of type 2 diabetes, obesity, and overactive bladder (OAB). Here, we report the cryogenic electron microscopy structure of the βAR-G signaling complex with the selective agonist mirabegron, a first-in-class drug for OAB. Comparison of this structure with the previously reported βAR and βAR structures reveals a receptor activation mechanism upon mirabegron binding to the orthosteric site. Notably, the narrower exosite in βAR creates a perpendicular pocket for mirabegron. Mutational analyses suggest that a combination of both the exosite shape and the amino-acid-residue substitutions defines the drug selectivity of the βAR agonists. Our findings provide a molecular basis for βAR subtype selectivity, allowing the design of more-selective agents with fewer adverse effects.
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