Self-assembly of minimal peptoid sequences

Castelletto, Valeria and Seitsonen, Jani and Tewari, Kunal M. and Hasan, Abshar and Edkins, Robert M. and Ruokolainen, Janne and Pandey, Lalit M. and Hamley, Ian W. and Lau, King Hang Aaron (2020) Self-assembly of minimal peptoid sequences. ACS Macro Letters, 9 (4). pp. 494-499. ISSN 2161-1653 (https://doi.org/10.1021/acsmacrolett.9b01010)

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Abstract

Peptoids are biofunctional N-substituted glycine peptidomimics. Their self-assembly is of fundamental interest because they demonstrate alternatives to conventional peptide structures based on backbone chirality and beta-sheet hydrogen bonding. The search for self-assembling, water-soluble "minimal" sequences, be they peptide or peptidomimic, is a further challenge. Such sequences are highly desired for their compatibility with biomacromolecules and convenient synthesis for broader application. We report the self-assembly of a set of trimeric, water-soluble α-peptoids that exhibit a relatively low critical aggregation concentration (CAC ∼0.3 wt %). Cryo-EM and angle-resolved DLS show different sequence-dependent morphologies, namely uniform ca. 6 nm wide nanofibers, sheets, and clusters of globular assemblies. Absorbance and fluorescence spectroscopies indicate unique phenyl environments for π-interactions in the highly ordered nanofibers. Assembly of our peptoids takes place when the sequences are fully ionized, representing a departure from superficially similar amyloid-type hydrogen-bonded peptide nanostructures and expanding the horizons of assembly for sequence-specific bio- and biomimetic macromolecules.

  • Item type:Article
    ID code:71832
    Dates:
    Date
    Event
    21 April 2020
    Published
    19 March 2020
    Published Online
    10 March 2020
    Accepted
    27 June 2019
    Submitted
    Subjects:Science > Chemistry
    Department:Faculty of Science > Pure and Applied Chemistry
    Depositing user: Pure Administrator
    Date deposited:20 Mar 2020 13:13
    Last modified:09 Apr 2024 00:46
    URI:https://strathprints.strath.ac.uk/id/eprint/71832
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