RESUMEN
The µ-opioid receptor (µOR) is the major target for opioid analgesics. Activation of µOR initiates signaling through G protein pathways as well as through ß-arrestin recruitment. µOR agonists that are biased towards G protein signaling pathways demonstrate diminished side effects. PZM21, discovered by computational docking, is a G protein biased µOR agonist. Here we report the cryoEM structure of PZM21 bound µOR in complex with Gi protein. Structure-based evolution led to multiple PZM21 analogs with more pronounced Gi protein bias and increased lipophilicity to improve CNS penetration. Among them, FH210 shows extremely low potency and efficacy for arrestin recruitment. We further determined the cryoEM structure of FH210 bound to µOR in complex with Gi protein and confirmed its expected binding pose. The structural and pharmacological studies reveal a potential mechanism to reduce ß-arrestin recruitment by the µOR, and hold promise for developing next-generation analgesics with fewer adverse effects.
