Cryo-EM structures of ρ1 GABA_A receptors with antagonist and agonist drugs.

ABSTRACT: The family of ρ-type GABA_A receptors includes potential therapeutic targets in several neurological conditions, and features distinctive pharmacology compared to other subtypes. Here we report four cryo-EM structures with previously unresolved ligands, electrophysiology recordings, and molecular dynamics simulations to characterize binding and conformational impact of the drugs THIP (a non-opioid analgesic), CGP36742 (a phosphinic acid) and GABOB (an anticonvulsant) on a human ρ1 GABA_A receptor. A distinctive binding pose of THIP in ρ1 versus α4β3δ GABA_A receptors offers a rationale for its inverse effects on these subtypes. CGP36742 binding is similar to the canonical ρ-type inhibitor TPMPA, supporting a shared mechanism of action among phosphinic acids. B

SUBMITTER: Fan C 

PROVIDER: S-EPMC12316911 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature