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Peptide foldamers containing both cis‐β‐aminocyclopentanecarboxylic acid and α‐amino acid residues combined in various sequence patterns (ααβ, αααβ, αβααβ, and ααβαααβ) were screened using CD and NMR spectroscopy for the tendency to form helices. ααβ‐Peptides were found to fold into an unprecedented and well‐defined 16/17/15/18/14/17‐helix. By extending the length of the sequence or shifting a fragment...
The conformational heterogeneity of backbone N‐substituted peptides limits their ability to adopt stable secondary structures. Herein, we describe a practical synthesis of backbone aminated peptides that readily adopt β‐sheet folds. Data derived from model N‐amino peptides suggest that extended conformations are stabilized through cooperative steric, electrostatic, and hydrogen‐bonding interactions.
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