Aromatic Foldamer Helices as α-Helix Extended Surface Mimetics

Area of Science:

• Supramolecular Chemistry
• Organic Chemistry
• Structural Biology

Background:

• Helically folded aromatic oligoamide foldamers possess unique size and geometry, differing significantly from alpha-helices.
• Despite structural differences, these foldamers present numerous sites for side-chain attachment, suggesting potential for functional mimicry.

Purpose of the Study:

• To investigate if aromatic oligoamide foldamers can mimic extended alpha-helical surfaces through strategic side-chain placement.
• To develop synthetic methodologies for creating functionalized quinoline monomers for solid-phase synthesis.
• To explore the potential of these foldamers in protein surface recognition and controlled helix bundling.

Main Methods:

• Development of synthetic routes for functionalized quinoline monomers.
• Solid-phase synthesis of an aromatic oligoamide dodecamer.
• X-ray crystallography to determine the foldamer's crystal structure and analyze its self-assembly.

Main Results:

• Demonstrated that specific side-chain arrangements on aromatic helices can effectively mimic extended alpha-helical surfaces.
• Successfully synthesized functionalized quinoline monomers and assembled a dodecamer foldamer.
• Crystal structure analysis confirmed the design and revealed helix bundling through an alpha-helix-like interface.

Conclusions:

• Aromatic oligoamide foldamers can be engineered to mimic protein alpha-helical surfaces, despite inherent structural dissimilarities.
• The developed synthetic methods facilitate the creation of complex foldamer structures for specific applications.
• These findings open avenues for using aromatic helices in targeted protein recognition and for programming self-assembly in aqueous environments.