13-Helix folding of a β/γ-peptide manifold designed from a minimal-constraint'' blueprint

A bottom-up design rationale was adopted to devise beta/gamma-peptide foldamer manifolds which would adopt preferred 13-helix conformations, relying on minimal steric imposition brought by the constituent amino acid residues. In this way, a well-defined 13-helix conformer was revealed for short oligomers of trans-2-aminocyclobutanecarboxylic acid and gamma(4)-amino acids in alternation, which gave good topological superposition upon an alpha-helix motif.