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Tryptophan-Based Self-Assembling Peptides with Bacterial Flocculation and Antimicrobial Properties.

Jikun Zhang1, Shengnan Liu1, Hang Li1

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Tryptophan-containing peptides self-assemble into nanostructures and form hydrogels. These peptides also disrupt bacterial membranes, causing cell death in E. coli and S. aureus.

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Area of Science:

  • Biochemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Tryptophan (Trp), an aromatic amino acid, is crucial for protein structure and molecular interactions.
  • Trp's potential in designing self-assembling peptides and gelators remains underexplored.

Purpose of the Study:

  • To investigate the role of tryptophan residues in regulating peptide self-assembly and gelation.
  • To explore the application of Trp-based peptides in supramolecular chemistry and antimicrobial strategies.

Main Methods:

  • Synthesis of short peptides incorporating tryptophan residues.
  • Characterization of self-assembly behavior and hydrogel formation.
  • Assessment of peptide interactions with bacterial lipid membranes.

Main Results:

  • Tryptophan incorporation diversified peptide gelator structures.
  • Aromatic and hydrogen-bonding interactions promoted self-assembly into twisted helical nanostructures.
  • Supramolecular hydrogels were formed with low minimal gelation concentrations.
  • Trp-based peptides showed strong affinity for bacterial membranes, inducing flocculation and cell death in E. coli and S. aureus.

Conclusions:

  • Tryptophan residues can effectively direct peptide self-assembly and gelation.
  • Trp-based peptides form novel nanostructures and hydrogels with potent antimicrobial activity.
  • These findings highlight the potential of tryptophan in designing functional biomaterials and antimicrobial agents.