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A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
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Related Experiment Video

Updated: Jun 25, 2025

Constructing Cyclic Peptides Using an On-Tether Sulfonium Center
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Synthesis of All-Peptide-Based Rotaxane from a Proline-Containing Cyclic Peptide.

Taichi Kurita1, Masahiro Higashi2, Joan Gimenez-Dejoz3,4

  • 1Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.

Biomacromolecules
|May 29, 2024
PubMed
Summary

Researchers developed a novel method to synthesize all-peptide rotaxanes, overcoming previous limitations in creating mechanically interlocked peptide materials. This breakthrough enables the creation of advanced, biodegradable protein-based materials with enhanced mechanical properties.

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Area of Science:

  • Polymer Chemistry
  • Supramolecular Chemistry
  • Biomaterials Science

Background:

  • Rotaxane cross-linkers improve polymer toughness via stress dispersion from mobile interlocked structures.
  • Current rotaxane cross-linkers have limited diversity and poor compatibility with peptides and proteins.
  • All-peptide rotaxanes could offer biodegradable cross-linkers for protein fortification, enhancing mechanical properties and biodegradability.

Purpose of the Study:

  • To overcome the challenge of synthesizing all-peptide-based rotaxanes.
  • To develop a method for creating biodegradable, peptide-compatible rotaxane cross-linkers.
  • To enable the creation of novel peptide- and protein-based materials with enhanced functionalities.

Main Methods:

  • Employed an active template method for proline-containing cyclic peptides.
  • Utilized molecular dynamics simulations to identify favorable structural features for rotaxane synthesis.
  • Synthesized all-peptide-based rotaxanes.

Main Results:

  • Successfully synthesized all-peptide-based rotaxanes using the active template method.
  • Molecular dynamics simulations indicated that cyclic peptides with large inner cavities and centrally oriented carbonyl oxygens facilitate rotaxane formation.
  • Demonstrated a viable route for creating mechanically interlocked peptide structures.

Conclusions:

  • The active template method is effective for synthesizing all-peptide rotaxanes.
  • Specific structural features of cyclic peptides are crucial for successful rotaxane synthesis.
  • This method is expected to advance the development of peptide- and protein-based materials with unique mechanical properties and functionalities.