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Bulky Dehydroamino Acids Enhance Proteolytic Stability and Folding in β-Hairpin Peptides
- Jalan, Ankur, Kastner, David W., Webber, Kei G. I., Smith, Mason S., Price, Joshua L., Castle, Steven L.
- Organic letters 2017 v.19 no.19 pp. 5190-5193
- amino acids, chemical structure, organic compounds, peptides, proteolysis
- The bulky dehydroamino acids dehydrovaline (ΔVal) and dehydroethylnorvaline (ΔEnv) can be inserted into the turn regions of β-hairpin peptides without altering their secondary structures. These residues increase proteolytic stability, with ΔVal at the (i + 1) position having the most substantial impact. Additionally, a bulky dehydroamino acid can be paired with a d-amino acid (i.e., d-Pro) to synergistically enhance resistance to proteolysis. A link between proteolytic stability and peptide structure is established by the finding that a stabilized ΔVal-containing β-hairpin is more highly folded than its Asn-containing congener.