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Updated: May 16, 2026

Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding
Published on: June 9, 2017
The VPAC1 receptor: structure and function of a class B GPCR prototype.
A Couvineau1, E Ceraudo, Y-V Tan
1Faculté de Médecine Xavier Bichat, INSERM 773/Centre de Recherche Biomédicale Bichat Beaujon (CRB3), Université Paris 7 Paris Cedex 18, France.
Vasoactive Intestinal Peptide (VIP) binds to the VPAC1 receptor's N-terminal ectodomain and transmembrane domain. This interaction is crucial for VIP's role in treating neurodegenerative and inflammatory diseases.
Area of Science:
- Pharmacology
- Molecular Biology
- Neuroscience
Background:
- Class B G protein-coupled receptors (GPCRs) are drug targets for inflammation, neurodegeneration, and other diseases.
- The VPAC1 receptor binds Vasoactive Intestinal Peptide (VIP), a neuropeptide with diverse physiological roles.
- VIP shows therapeutic potential in neurodegenerative and inflammatory conditions.
Purpose of the Study:
- To review current knowledge on VPAC1 receptor structure and molecular pharmacology.
- To elucidate the structure-function relationship of VPAC1 receptor in VIP recognition.
Main Methods:
- Directed mutagenesis
- Photoaffinity labeling
- Nuclear Magnetic Resonance (NMR)
- Molecular modeling
- Molecular dynamic simulation
Main Results:
- The N-terminal ectodomain (N-ted) of VPAC1 is critical for VIP binding.
- VIP's central and C-terminal regions interact with the Sushi domain of the VPAC1 N-ted.
- VIP's N-terminal end interacts with the receptor's first transmembrane domain, involving key residues K143, T144, and T147.
Conclusions:
- Structure-function studies reveal specific interaction sites between VIP and VPAC1.
- Understanding these molecular interactions can inform drug development for VIP-related therapeutic applications.
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