Self-assembly of amphiphilic tripeptides with sequence-dependent nanostructure

Area of Science:

• Supramolecular chemistry
• Materials science
• Biomaterials engineering

Background:

• Supramolecular chemistry facilitates the design of nanostructures for biomaterials and therapeutics.
• Self-assembling peptides are widely utilized due to their tunable properties derived from amino acid building blocks.

Purpose of the Study:

• To report a family of amphiphilic tripeptides with sequence-controlled nanostructure formation.
• To demonstrate the ability to generate diverse nanostructures with varying aspect ratios and geometries by altering a single amino acid.
• To investigate the potential of these peptides as biomaterials, including hydrogel formation and cell viability support.

Main Methods:

• Synthesis of amphiphilic tripeptides with systematic sequence variations.
• Characterization of self-assembled nanostructures using various microscopy and spectroscopy techniques.
• Assessment of hydrogel formation and cell culture studies to evaluate biomaterial properties.

Main Results:

• A single amino acid change in tripeptides led to diverse nanostructures (e.g., filaments, high aspect-ratio structures).
• High aspect-ratio peptide structures formed physically entangled hydrogels.
• The developed peptide nanostructures supported cell viability in culture.
• These filamentous nanostructures formed without typical secondary structures like beta-sheets.

Conclusions:

• Facile method to obtain versatile biomaterials with tunable nanostructural morphology from short, defined peptide sequences.
• Demonstrated potential of these novel peptides for applications in tissue engineering and regenerative medicine.
• Highlights a new class of peptide self-assembly distinct from traditional beta-sheet driven systems.