Collagen Mimicry with a Short Collagen Model Peptide

Area of Science:

• Biomaterials Science
• Peptide Chemistry
• Supramolecular Chemistry

Background:

• Mimicking collagen's triple helix and fibrillar network with short collagen model peptides (CMPs) containing Gly-Pro-Hyp (GPO) repeats is challenging.
• Existing CMPs often require longer sequences to achieve stable structures.

Purpose of the Study:

• To design and synthesize a minimalistic CMP with GPO repeats that can form stable triple helices and fibrillar networks.
• To investigate the role of specific peptide fusions and chemical motifs in stabilizing CMP structures.

Main Methods:

• Synthesized a novel CMP, FmP-5GPO, by fusing an Fmoc-protected peptide (NFGAIL) and phenylalanine to a (GPO)5 core.
• Characterized the self-assembly behavior of FmP-5GPO in aqueous buffer solutions at room temperature.
• Investigated the structural stability using melting point analysis and assessed cell viability of the formed fibrils.

Main Results:

• FmP-5GPO self-assembles into a robust triple helix at room temperature with a melting point of 35°C.
• The fluorenylmethoxycarbonyl (Fmoc) group and the NFGAIL peptide contribute to triple helix stabilization through π-π interactions, hydrogen bonding, and hydrophobic interactions.
• The CMP forms highly entangled, micrometer-length nanofibrils with excellent cell viability.

Conclusions:

• A short, minimalistic CMP sequence (FmP-5GPO) successfully mimics collagen's triple helix and fibrillar structure.
• The strategic fusion of specific peptides and chemical groups can stabilize short CMPs, offering a new approach for biomaterial design.
• This work demonstrates the potential for developing novel CMP-based biomaterials through rational sequence design.