Peptide–Bismuth Bicycles: In Situ Access to Stable Constrained Peptides with Superior Bioactivity

Saan Voss, Jörg Rademann, Christoph Nitsche*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    22 Citations (Scopus)

    Abstract

    Constrained peptides are promising next-generation therapeutics. We report here a fundamentally new strategy for the facile generation of bicyclic peptides using linear precursor peptides with three cysteine residues and a non-toxic trivalent bismuth(III) salt. Peptide–bismuth bicycles form instantaneously at physiological pH, are stable in aqueous solution for many weeks, and much more resistant to proteolysis than their linear precursors. The strategy allows the in situ generation of bicyclic ligands for biochemical screening assays. We demonstrate this for two screening campaigns targeting the proteases from Zika and West Nile viruses, revealing a new lead compound that displayed inhibition constants of 23 and 150 nM, respectively. Bicyclic peptides are up to 130 times more active and 19 times more proteolytically stable than their linear analogs without bismuth.

    Original languageEnglish
    Article numbere202113857
    JournalAngewandte Chemie - International Edition
    Volume61
    Issue number4
    DOIs
    Publication statusPublished - 21 Jan 2022

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