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"publishedYear" : 2013, "abstractText" : "The principles of beta-sheet folding and design for alpha-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 beta-amino-acid-containing foldamers, we followed a top-down approach to study a series of alpha/beta-peptidic analogs of anginex, a beta-sheet-forming antiangiogenic peptide. Eight anginex analogs were developed by systematic alpha --> beta(3) substitutions and analyzed by using NMR and CD spectroscopy. The foldamers retained the beta-sheet tendency, though with a decreased folding propensity. beta-Sheet formation could be induced by a micellar environment, similarly to that of the parent peptide. The destructuring effect was higher when the alpha --> beta(3) exchange was located in the beta-sheet core. Analysis of the beta-sheet stability versus substitution pattern and the local conformational bias of the bulky beta(3)V and beta(3)I residues revealed that a mismatch between the H-bonding preferences of the alpha- and beta-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 alpha/beta-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. 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