Dipeptide self-assembly into water-channels and gel biomaterial

Area of Science:

• Supramolecular chemistry
• Biomaterials science
• Peptide self-assembly

Background:

• Dipeptides are cost-effective, environmentally friendly building blocks for supramolecular biomaterials.
• Hydrophobicity is crucial for self-assembly in unprotected dipeptides, exemplified by Phe-Phe.
• Homochiral dipeptides like Phe-Val and Val-Phe typically do not gel aqueous buffers.

Purpose of the Study:

• To investigate emerging design rules for self-assembling dipeptides.
• To explore the self-assembly behavior of heterochiral dipeptides (Phe-Val and Val-Phe).
• To characterize the resulting structures and properties for biomaterial applications.

Main Methods:

• Synthesis and characterization of heterochiral dipeptides.
• Spectroscopic analyses (NMR, CD, IR, Raman) and mass spectrometry (LC-MS).
• Rheology, electron microscopy, and single-crystal X-ray diffraction for structural and functional assessment.

Main Results:

• The heterochiral dipeptide D-Phe-L-Val self-assembles into supramolecular water-channels.
• These channels are formed by four peptide molecules arranged head-to-tail.
• D-Phe-L-Val lacks amyloid character and exhibits excellent in vitro biocompatibility.

Conclusions:

• This study advances the molecular design rules for minimalistic, unprotected dipeptides.
• D-Phe-L-Val is the first heterochiral dipeptide forming water-channels, offering precise nanomorphological control.
• Findings support the development of novel supramolecular biomaterials with tailored properties.