Helical Stabilization of Peptide Macrocycles by Stapled Architectures

Area of Science:

• Medicinal Chemistry
• Biochemistry
• Materials Science

Background:

• Macrocyclic peptides are crucial in biological systems.
• Short peptides often lack stability and cell permeability.
• Stabilizing peptide structures enhances their therapeutic and material potential.

Purpose of the Study:

• To systematically review strategies for stabilizing macrocyclic peptides into alpha-helix structures.
• To highlight the advantages of stabilized macrocyclic peptides over unmodified peptides.
• To discuss applications in protein-protein interaction inhibition and self-assembly materials.

Main Methods:

• Side chain to side chain cross-linking.
• N-terminal helix nucleation.
• Specific chemical strategies including ring-closing metathesis (RCM), lactamisation, cycloadditions, reversible reactions, thioether formation, and sulfonium center formation.

Main Results:

• Developed strategies significantly enhance the stability of macrocyclic peptides.
• Stabilized peptides exhibit improved biophysical properties: higher serum stability, enhanced cell permeability, and increased target affinity.
• These stable structures are applicable as protein-protein interaction inhibitors and in self-assembly materials.

Conclusions:

• Stapling techniques provide effective methods for creating stable alpha-helical macrocyclic peptides.
• These stabilized peptides offer superior properties for diverse applications.
• Continued development in this area promises advancements in peptide-based therapeutics and materials.