State-Specific Peptide Design Targeting G Protein-Coupled Receptors

Area of Science:

• Pharmacology
• Structural Biology
• Drug Discovery

Background:

• G protein-coupled receptors (GPCRs) are crucial drug targets involved in numerous physiological processes.
• Peptides offer advantages over small molecules for GPCR targeting due to higher affinity, selectivity, and potency.
• GPCR conformational states (active/inactive) dictate ligand interactions, necessitating state-specific design strategies.

Purpose of the Study:

• To develop an efficient, state-specific peptide design pipeline for GPCRs.
• To enable the tailored design of peptide agonists or antagonists based on GPCR structural states.
• To validate the pipeline by identifying novel peptides for specific GPCR targets.

Main Methods:

• Developed a state-specific peptide design framework for GPCRs.
• Utilized GPCR active and inactive conformational states for tailored peptide design.
• Employed a state-specific folding model optimized for GPCR-peptide complexes to select high-potential peptides.

Main Results:

• Successfully designed and identified peptide agonists and antagonists for the Apelin Receptor (APJR) and Growth Hormone Secretagogue Receptor (GHSR).
• Identified a competitive inhibitor peptide for the Glucagon-Like Peptide-1 Receptor (GLP-1R).
• Demonstrated the efficacy of the state-specific design pipeline in generating functional peptides.

Conclusions:

• The developed pipeline provides an efficient strategy for state-specific peptide design targeting GPCRs.
• This approach facilitates the discovery of novel peptide therapeutics with improved specificity and potency.
• The findings open new avenues for peptide-based drug development for various GPCRs.