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• W2952872867 abstract "The orphan G-protein-coupled receptor (GPCR) GPR158 is expressed in the brain, where it is involved in the osteocalcin effect on cognitive processes, and at the periphery, where it may contribute to glaucoma and cancers. GPR158 forms a complex with RGS7-β5, leading to the regulation of neighboring GPCR-induced Go protein activity. GPR158 also interacts with αo, although no canonical Go coupling has been reported. GPR158 displays three VCPWE motifs in its C-terminal domain that are putatively involved in G-protein regulation. Here, we addressed the scaffolding function of GPR158 and its VCPWE motifs on Go. We observed that GPR158 interacted with and stabilized the amount of RGS7-β5 through a 50-residue region downstream of its transmembrane domain and upstream of the VCPWE motifs. We show that two VCPWE motifs are involved in αo binding. Using a Gαo-βγ bioluminescence resonance energy transfer (BRET) sensor, we found that GPR158 decreases the BRET signal as observed upon G-protein activation; however, no constitutive activity of GPR158 could be detected through the measurement of various G-protein-mediated downstream responses. We propose that the effect of GPR158 on Go is unlikely due to a canonical activation of Go, but rather to the trapping of Gαo by the VCPWE motifs, possibly leading to its dissociation from βγ Such action of GPR158 is expected to prolong the βγ activity, as also observed with some activators of G-protein signaling. Taken together, our data revealed a complex functional scaffolding or signaling role for GPR158 controlling Go through an original mechanism." @default.
• W2952872867 created "2019-06-27" @default.
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• W2952872867 date "2019-06-12" @default.
• W2952872867 modified "2023-10-16" @default.
• W2952872867 title "Nonclassical Ligand-Independent Regulation of Go Protein by an Orphan Class C G-Protein–Coupled Receptor" @default.
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• W2952872867 doi "https://doi.org/10.1124/mol.118.113019" @default.
• W2952872867 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31189666" @default.
• W2952872867 hasPublicationYear "2019" @default.
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