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Human GLP-1 receptor transmembrane domain structure in complex with allosteric modulators.

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Structural insights into the glucagon-like peptide-1 receptor (GLP-1R) reveal a common binding site for negative allosteric modulators. This finding aids in understanding receptor function and developing new type 2 diabetes treatments.

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Area of Science:

  • Structural biology
  • Pharmacology
  • Endocrinology

Background:

  • Glucagon-like peptide-1 receptor (GLP-1R) and glucagon receptor (GCGR) are class B GPCRs with opposing roles in glucose homeostasis.
  • Positive GLP-1R modulation is crucial for type 2 diabetes treatment by regulating insulin and glucagon secretion.

Purpose of the Study:

  • To determine the structural basis of GLP-1R inhibition by negative allosteric modulators (NAMs).
  • To identify potential allosteric binding sites for both negative and positive allosteric modulators (NAMs and PAMs) of GLP-1R.

Main Methods:

  • X-ray crystallography of the human GLP-1R transmembrane domain with NAMs (PF-06372222 and NNC0640).
  • Molecular modeling and mutagenesis studies.

Main Results:

  • Crystal structures revealed a common binding pocket for GLP-1R and GCGR NAMs outside helices V-VII.
  • The receptor adopts an inactive conformation, with NAMs restricting helix VI movement.
  • Agonist PAMs appear to target a distinct sub-pocket at the V-VI helix interface.

Conclusions:

  • Identified a conserved allosteric binding site for NAMs in GLP-1R and GCGR.
  • Structural data provides a foundation for designing novel GLP-1R modulators for type 2 diabetes.
  • Understanding allosteric modulation mechanisms can inform the development of targeted GPCR therapies.