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The trpzip peptides are small, monomeric, and extremely stable β-hairpins that have become valuable tools for studying protein folding. Here, we show that trpzip-3 inhibits aggregation in two very different amyloid systems: transthyretin and Aβ(1-42). Interestingly, Trp → Leu mutations renders the peptide ineffective against transthyretin, but Aβ inhibition remains. Computational docking was used to predict the interactions between trpzip-3 and transthyretin, suggesting that inhibition occurs via binding to the outer region of the thyroxine-binding site, which is supported by dye displacement experiments.

Designed Trpzip-3 β-Hairpin Inhibits Amyloid Formation in Two Different Amyloid Systems