8XWQ image
Entry Detail
PDB ID:
8XWQ
EMDB ID:
Title:
Cryo-EM structure of ET-1 bound ETBR-DNGI complex
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2024-01-16
Release Date:
2024-10-02
Method Details:
Experimental Method:
Resolution:
4.60 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Guanine nucleotide-binding protein G(i) subunit alpha-1
Chain IDs:C (auth: A)
Chain Length:354
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
Chain IDs:D (auth: B)
Chain Length:344
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
Chain IDs:E (auth: C)
Chain Length:71
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:SCFV16
Chain IDs:F (auth: D)
Chain Length:277
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Description:Endothelin-1
Chain IDs:B (auth: L)
Chain Length:21
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Endothelin receptor type B
Chain IDs:A (auth: R)
Chain Length:346
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Structure of endothelin ET B receptor-G i complex in a conformation stabilized by unique NPxxL motif.
Commun Biol 7 1303 1303 (2024)
PMID: 39414992 DOI: 10.1038/s42003-024-06905-z

Abstact

Endothelin type B receptor (ETBR) plays a crucial role in regulating blood pressure and humoral homeostasis, making it an important therapeutic target for related diseases. ETBR activation by the endogenous peptide hormones endothelin (ET)-1-3 stimulates several signaling pathways, including Gs, Gi/o, Gq/11, G12/13, and β-arrestin. Although the conserved NPxxY motif in transmembrane helix 7 (TM7) is important during GPCR activation, ETBR possesses the lesser known NPxxL motif. In this study, we present the cryo-EM structure of the ETBR-Gi complex, complemented by MD simulations and functional studies. These investigations reveal an unusual movement of TM7 to the intracellular side during ETBR activation and the essential roles of the diverse NPxxL motif in stabilizing the active conformation of ETBR and organizing the assembly of the binding pocket for the α5 helix of Gi protein. These findings enhance our understanding of the interactions between GPCRs and G proteins, thereby advancing the development of therapeutic strategies.

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Primary Citation of related structures