Polysubstituted cyclohexane γ-amino acids induce a double α-/β-turn in short non-natural peptides

29 December 2022, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


We describe short non-natural peptides that adopt α- and β-turn folds in solution and in the crystal. The peptides are constituted by a core of trans and cis stereoisomers of polyhydroxylated cyclohexane γ-amino acids, flanked by dimers of L-α-alanine, resulting in hybrid hexapeptides with an ααγγαα backbone. DFT calculations and spectroscopic analysis by NMR, CD and FT-IR in solution are consistent with structural changes upon deprotection of certain hydroxyl groups of the central polyhydroxylated γ-amino acids. X-ray diffraction analysis of a crystalline sample revealed a double α-/β-turn that was also identified by NMR spectroscopy in acetonitrile-d3 solution.


g-amino acids


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