A biased allosteric modulator is a molecular glue for β(2)AR dimerization.

A biased allosteric modulator acts as a molecular glue to stabilize β(2)AR dimerization, revealing a new mechanism for GPCR regulation.

• Why it matters: Understanding GPCR dimerization is crucial because it influences receptor signaling and therapeutic targeting, yet the mechanisms and potential for modulation remain largely unexplored.
• What they did: The study used cryogenic electron microscopy and cellular assays to show that AP-7-168 binds within a pocket of two β(2)AR molecules, promoting dimer formation and preventing β-arrestin coupling.
• The result: This discovery demonstrates that small molecules can bias GPCR signaling by stabilizing specific dimeric states, opening new avenues for targeted receptor modulation.