Peptide-induced RAFT polymerization via an amyloid-β_17-20-based chain transfer agent

Area of Science:

• Polymer Chemistry
• Biomaterials Science
• Peptide Conjugation

Background:

• Amyloid-β (Aβ) peptides are implicated in neurodegenerative diseases.
• Developing functional hydrogels requires precise control over material properties.
• Peptide-polymer conjugates offer versatile platforms for advanced materials.

Purpose of the Study:

• To synthesize a novel peptide/polymer conjugate incorporating the Aβ core sequence (Leu-Val-Phe-Phe, Aβ17-20).
• To develop mechanically robust, peptide-functional cross-linked polymeric hydrogels.
• To explore the utility of RAFT polymerization for creating well-defined peptide-polymer architectures.

Main Methods:

• Synthesis of a novel peptide/polymer-conjugate using Reversible Addition-Fragmentation chain Transfer (RAFT) polymerization.
• Employment of a novel chain transfer agent for a 'grafting-from' approach.
• Characterization of the resulting peptide-polymer conjugates and hydrogels.

Main Results:

• Successful synthesis of well-defined peptide-polymer conjugates embedding the Aβ17-20 sequence.
• Achieved high monomer conversion rates during RAFT polymerization.
• Fabricated mechanically stiffer peptide-functional cross-linked polymeric hydrogels.

Conclusions:

• The 'grafting-from' RAFT polymerization approach is effective for creating defined peptide-polymer conjugates.
• The synthesized conjugates can form mechanically robust hydrogels with tunable properties.
• This work provides a new route to peptide-functional materials with potential applications in biomaterials.