Peptide to Peptoid Substitutions Increase Cell Permeability in Cyclic Hexapeptides
- PMID: 26046483
- DOI: 10.1021/acs.orglett.5b01162
Peptide to Peptoid Substitutions Increase Cell Permeability in Cyclic Hexapeptides
Abstract
The effect of peptide-to-peptoid substitutions on the passive membrane permeability of an N-methylated cyclic hexapeptide is examined. In general, substitutions maintained permeability but increased conformational heterogeneity. Diversification with nonproteinogenic side chains increased permeability up to 3-fold. Additionally, the conformational impact of peptoid substitutions within a β-turn are explored. Based on these results, the strategic incorporation of peptoid residues into cyclic peptides can maintain or improve cell permeability, while increasing access to diverse side-chain functionality.
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