Related Experiment Video
Updated: Aug 21, 2025

Semi-automated Biopanning of Bacterial Display Libraries for Peptide Affinity Reagent Discovery and Analysis of Resulting Isolates
Published on: December 6, 2017
Understanding VPAC receptor family peptide binding and selectivity
Sarah J Piper1,2, Giuseppe Deganutti3, Jessica Lu1,2
1Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, 3052, VIC, Australia.
Vasoactive intestinal peptide (VIP) and pituitary adenylate cyclase-activating polypeptide (PACAP) receptor interactions were structurally analyzed. This reveals key differences in peptide binding, explaining VIP
Area of Science:
- Structural Biology
- Neuroendocrinology
- Molecular Pharmacology
Background:
- Vasoactive intestinal peptide (VIP) and pituitary adenylate cyclase-activating polypeptide (PACAP) receptors are crucial for neurological functions.
- Existing structural data is insufficient for a complete understanding of peptide binding and receptor selectivity.
Purpose of the Study:
- To determine the structures of active, Gs-coupled VIP-VPAC1R, PACAP27-VPAC1R, and PACAP27-PAC1R complexes.
- To elucidate the molecular mechanisms underlying peptide binding and receptor selectivity.
Main Methods:
- Cryo-electron microscopy (Cryo-EM) for structural determination.
- Molecular dynamics simulations (MDSs) to analyze peptide-receptor interactions and dynamics.
Main Results:
- Fewer stable interactions were observed between VPAC1R and VIP compared to PACAP27.
- VIP exhibited more dynamic interactions with VPAC1R's extracellular loop 3.
- Conserved N-terminal peptide residues showed receptor-dependent interactions within the receptor core.
- MD simulations predicted more transient VIP-PAC1R interactions than VIP-VPAC1R interactions.
Conclusions:
- The study provides detailed molecular insights into peptide engagement with PAC1R and VPAC1R.
- Observed interaction differences may explain VIP's selectivity for VPAC1R over PAC1R.
- Findings could aid in the development of novel selective agonists for these receptors.
More Related Videos
06:50Author Spotlight: A Computational Approach to Decipher Amino Acid Preferences in Multispecific Protein-Protein Interactions
Published on: January 26, 2024
08:31Biosensor-based High Throughput Biopanning and Bioinformatics Analysis Strategy for the Global Validation of Drug-protein Interactions
Published on: December 1, 2020
Related Concept Videos
Dose-Response Relationship: Selectivity and Specificity
Phosphoinositides and PIPs
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
Transducer Mechanism: G Protein–Coupled Receptors
GPCRs are also called heptahelical,...
GPCR Desensitization
Transducer Mechanism: Enzyme-Linked Receptors
Major types that are helpful drug targets include:
G Protein-coupled Receptors
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...