β-Peptoid Foldamers at Last

Area of Science:

• Chemical Biology
• Medicinal Chemistry
• Polymer Chemistry

Background:

• Peptides face challenges in drug development due to poor pharmacokinetics and susceptibility to proteases.
• Foldamers, synthetic molecules mimicking biopolymer folding, offer protease resistance and improved drug-like properties.
• β-peptoids, oligomers of N-alkylated 3-aminopropionic acid, were explored as potential peptidomimetic foldamers.

Purpose of the Study:

• To investigate the potential of β-peptoids as a novel class of peptidomimetic foldamers.
• To overcome initial challenges in achieving stable secondary structures with β-peptoid oligomers.
• To enable structure-based design of β-peptoid scaffolds for biomedical applications.

Main Methods:

• Synthesis and characterization of β-peptoid oligomers with varying chain lengths and side chains.
• Exploration of incorporation into heterogeneous backbone constructs, including cyclic structures and combination with other residues.
• Investigation of biological activities, such as membrane-targeting and enzyme inhibition, of β-peptoid-containing peptidomimetics.

Main Results:

• Initial attempts to create homogeneous folded β-peptoid structures were unsuccessful, leading to heterogeneous backbone designs.
• Amphiphilic β-peptoid architectures demonstrated success in membrane-targeting applications (e.g., antimicrobial and cell-penetrating peptides).
• Recent advancements have enabled the creation of robustly folded homogeneous β-peptoid oligomers with controllable secondary structures.

Conclusions:

• β-peptoids are a promising class of peptidomimetics with potential for biomedical applications.
• The ability to control secondary structure in homogeneous β-peptoid backbones facilitates structure-based design.
• Future utility of β-peptoids is envisioned for designing scaffolds with predictable display of functionalities.