6VCB image
Entry Detail
PDB ID:
6VCB
EMDB ID:
Title:
Cryo-EM structure of the Glucagon-like peptide-1 receptor in complex with G protein, GLP-1 peptide and a positive allosteric modulator
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2019-12-20
Release Date:
2020-07-22
Method Details:
Experimental Method:
Resolution:
3.30 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Guanine nucleotide-binding protein G(s) subunit alpha isoforms short
Chain IDs:C (auth: A)
Chain Length:380
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:350
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: G)
Chain Length:71
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Nanobody 35
Chain IDs:F (auth: N)
Chain Length:160
Number of Molecules:1
Biological Source:Lama glama
Polymer Type:polypeptide(L)
Description:Glucagon-like peptide 1
Chain IDs:B (auth: P)
Chain Length:31
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Glucagon-like peptide 1 receptor
Chain IDs:A (auth: R)
Chain Length:445
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Structural insights into probe-dependent positive allosterism of the GLP-1 receptor.
Nat.Chem.Biol. 16 1105 1110 (2020)
PMID: 32690941 DOI: 10.1038/s41589-020-0589-7

Abstact

Drugs that promote the association of protein complexes are an emerging therapeutic strategy. We report discovery of a G protein-coupled receptor (GPCR) ligand that stabilizes an active state conformation by cooperatively binding both the receptor and orthosteric ligand, thereby acting as a 'molecular glue'. LSN3160440 is a positive allosteric modulator of the GLP-1R optimized to increase the affinity and efficacy of GLP-1(9-36), a proteolytic product of GLP-1(7-36). The compound enhances insulin secretion in a glucose-, ligand- and GLP-1R-dependent manner. Cryo-electron microscopy determined the structure of the GLP-1R bound to LSN3160440 in complex with GLP-1 and heterotrimeric Gs. The modulator binds high in the helical bundle at an interface between TM1 and TM2, allowing access to the peptide ligand. Pharmacological characterization showed strong probe dependence of LSN3160440 for GLP-1(9-36) versus oxyntomodulin that is driven by a single residue. Our findings expand protein-protein modulation drug discovery to uncompetitive, active state stabilizers for peptide hormone receptors.

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