sphingosine-1-phosphate receptor activity / regulation of meiotic nuclear division / electron transport chain / G protein-coupled receptor activity / positive regulation of cold-induced thermogenesis / adenylate cyclase-activating G protein-coupled receptor signaling pathway / periplasmic space / electron transfer activity / iron ion binding / heme binding ...sphingosine-1-phosphate receptor activity / regulation of meiotic nuclear division / electron transport chain / G protein-coupled receptor activity / positive regulation of cold-induced thermogenesis / adenylate cyclase-activating G protein-coupled receptor signaling pathway / periplasmic space / electron transfer activity / iron ion binding / heme binding / plasma membrane / cytoplasm 類似検索 - 分子機能
National Natural Science Foundation of China (NSFC)
中国
引用
ジャーナル: Nat Commun / 年: 2025 タイトル: Mechanism and function of GPR3 regulated by a negative allosteric modulator. 著者: Geng Chen / Jana Bláhová / Nico Staffen / Harald Hübner / Nadja Nunhöfer / Chen Qiu / Peter Gmeiner / Dorothee Weikert / Yang Du / Jun Xu / 要旨: Allosteric modulators have gained substantial interest in current GPCR drug discovery. Here, we present a mechanism of allosteric modulation involving the dimerization of GPR3, a promising drug ...Allosteric modulators have gained substantial interest in current GPCR drug discovery. Here, we present a mechanism of allosteric modulation involving the dimerization of GPR3, a promising drug target for metabolic diseases and central nervous system disorders. We show that GPR3 forms constitutive homodimers in live cells and reveal that the inhibitor AF64394 functions as a negative allosteric modulator (NAM) specifically targeting dimeric GPR3. Using cryogenic electron microscopy (cryo-EM), we determine the structures of the AF64394-bound GPR3 dimer and its dimer-Gs signaling complex. These high-resolution structures reveal that AF64394 binds to the transmembrane dimer interface. AF64394 binding prevents the dissociation of the GPR3 dimer upon engagement with Gs and restrains transmembrane helix 5 in an inactive-like intermediate conformation, leading to reduced coupling with Gs. Our studies unveil a mechanism of dimer-specific inhibition of signaling with significant implications for the discovery of drugs targeting GPCRs capable of dimerization.