Self-assembling α,γ-cyclic peptides that generate cavities with tunable properties

Area of Science:

• Supramolecular Chemistry
• Peptide Self-Assembly
• Organic Synthesis

Background:

• Self-assembling peptides are crucial for creating novel nanomaterials.
• Cyclic peptides offer unique structural stability and defined conformations.
• Controlling cavity size and properties is key for molecular recognition applications.

Purpose of the Study:

• To design and synthesize novel beta-sheet-based cyclic peptides.
• To create self-assembling peptide systems with tunable internal cavities.
• To investigate the influence of guest molecules on aggregate formation.

Main Methods:

• Design of cyclic peptide scaffolds incorporating gamma-amino acids.
• Synthesis of peptide monomers and subsequent cyclization.
• Characterization of self-assembled dimeric ensembles.
• Guest entrapment studies to determine binding properties.

Main Results:

• Successfully synthesized beta-sheet-based cyclic peptides.
• Demonstrated tunable cavity formation through gamma-amino acid modification.
• Showcased the ability of peptide dimers to entrap various guests.
• Established a correlation between guest properties and aggregate geometry.

Conclusions:

• The developed cyclic peptides form self-assembling dimeric ensembles with tunable cavities.
• The internal cavity properties can be modulated by incorporating different functional groups via a gamma-amino acid.
• The nature of the entrapped guest molecule dictates the final aggregate structure, offering a pathway for controlled self-assembly.