Triangular prism-shaped β-peptoid helices as unique biomimetic scaffolds

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Biomaterials Engineering

Background:

• Beta-peptoids are peptidomimetics derived from N-alkylated beta-alanine.
• Previous research suggested potential foldamer properties for beta-peptoids.
• These molecules are valuable in designing biologically active ligands.

Purpose of the Study:

• To demonstrate that beta-peptoids can form stable helical structures.
• To establish a framework for designing novel biomimetics with precise 3D functional group display.

Main Methods:

• High-resolution X-ray crystallography of homomeric beta-peptoid hexamers.
• Circular dichroism spectroscopy to analyze solution conformations.
• Molecular dynamics simulations to investigate structural stability.

Main Results:

• First high-resolution crystal structures of folded beta-peptoid hexamers obtained.
• Structures reveal stable right-handed helices with 3 residues/turn and 9.6-9.8 Å pitch.
• Solution studies confirm helical conformations and solvent-dependent behavior.

Conclusions:

• Beta-peptoids can be controllably folded into stable helical structures.
• This provides a new platform for creating functional biomimetic materials.
• Precise spatial control of functional groups is achievable for advanced applications.