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TitleGPR161 structure uncovers the redundant role of sterol-regulated ciliary cAMP signaling in the Hedgehog pathway.
Journal, issue, pagesNat Struct Mol Biol, Vol. 31, Issue 4, Page 667-677, Year 2024
Publish dateFeb 7, 2024
AuthorsNicholas Hoppe / Simone Harrison / Sun-Hee Hwang / Ziwei Chen / Masha Karelina / Ishan Deshpande / Carl-Mikael Suomivuori / Vivek R Palicharla / Samuel P Berry / Philipp Tschaikner / Dominik Regele / Douglas F Covey / Eduard Stefan / Debora S Marks / Jeremy F Reiter / Ron O Dror / Alex S Evers / Saikat Mukhopadhyay / Aashish Manglik /
PubMed AbstractThe orphan G protein-coupled receptor (GPCR) GPR161 plays a central role in development by suppressing Hedgehog signaling. The fundamental basis of how GPR161 is activated remains unclear. Here, we ...The orphan G protein-coupled receptor (GPCR) GPR161 plays a central role in development by suppressing Hedgehog signaling. The fundamental basis of how GPR161 is activated remains unclear. Here, we determined a cryogenic-electron microscopy structure of active human GPR161 bound to heterotrimeric G. This structure revealed an extracellular loop 2 that occupies the canonical GPCR orthosteric ligand pocket. Furthermore, a sterol that binds adjacent to transmembrane helices 6 and 7 stabilizes a GPR161 conformation required for G coupling. Mutations that prevent sterol binding to GPR161 suppress G-mediated signaling. These mutants retain the ability to suppress GLI2 transcription factor accumulation in primary cilia, a key function of ciliary GPR161. By contrast, a protein kinase A-binding site in the GPR161 C terminus is critical in suppressing GLI2 ciliary accumulation. Our work highlights how structural features of GPR161 interface with the Hedgehog pathway and sets a foundation to understand the role of GPR161 function in other signaling pathways.
External linksNat Struct Mol Biol / PubMed:38326651 / PubMed Central
MethodsEM (single particle)
Resolution2.74 Å
Structure data

40603

8smv

EMDB-40603, PDB-8smv:
GPR161 Gs heterotrimer
Method: EM (single particle) / Resolution: 2.74 Å

Chemicals

ChemComp-CLR:
CHOLESTEROL

Source
  • homo sapiens (human)
  • lama glama (llama)
KeywordsMEMBRANE PROTEIN / GPCR / orphan / active / Hedgehog

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