Foldameric α/β-peptide analogs of the β-sheet-forming antiangiogenic anginex: Structure and bioactivity

Zsófia Hegedüs, Edit Wéber, Éva Kriston-Pál, Ildikó Makra, Ágnes Czibula, Éva Monostori, Tamás A. Martinek

Research output: Article

26 Citations (Scopus)

Abstract

The principles of β-sheet folding and design for α-peptidic sequences are well established, while those for sheet mimetics containing homologated amino acid building blocks are still under investigation. To reveal the structure-function relations of β-amino-acid-containing foldamers, we followed a top-down approach to study a series of α/β-peptidic analogs of anginex, a β-sheet-forming antiangiogenic peptide. Eight anginex analogs were developed by systematic α → β3 substitutions and analyzed by using NMR and CD spectroscopy. The foldamers retained the β-sheet tendency, though with a decreased folding propensity. β-Sheet formation could be induced by a micellar environment, similarly to that of the parent peptide. The destructuring effect was higher when the α → β3 exchange was located in the β-sheet core. Analysis of the β-sheet stability versus substitution pattern and the local conformational bias of the bulky β3V and β3I residues revealed that a mismatch between the H-bonding preferences of the α- and β-residues played a minor role in the structure-breaking effect. Temperature-dependent CD and NMR measurements showed that the hydrophobic stabilization was scaled-down for the α/β-peptides. Analysis of the biological activity of the foldamer peptides showed that four anginex derivatives dose-dependently inhibited the proliferation of a mouse endothelial cell line. The α → β3 substitution strategy applied in this work can be a useful approach to the construction of bioactive β-sheet mimetics with a reduced aggregation tendency and improved pharmacokinetic properties.

Original languageEnglish
Pages (from-to)16578-16584
Number of pages7
JournalJournal of the American Chemical Society
Volume135
Issue number44
DOIs
Publication statusPublished - nov. 6 2013

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ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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