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Intrinsically Disordered Peptide Nanofibers from a Structured Motif Within Proteins.

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Researchers engineered self-assembling peptide nanofibers with intrinsic disorder by conjugating a structured motif to a tripeptide. These novel nanofibers form cell-compatible hydrogels, offering new biomaterial possibilities.

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Area of Science:

  • Biomaterials Science
  • Protein Engineering
  • Nanotechnology

Background:

  • Intrinsically disordered regions (IDRs) are crucial for protein function and signaling via higher-order assemblies.
  • The assembly properties and functions of intrinsically disordered peptides (IDPs) remain underexplored.
  • Developing strategies for engineering IDP assemblies is essential for novel biomaterial design.

Purpose of the Study:

  • To develop a facile strategy for engineering intrinsically disordered peptide (IDP) assemblies.
  • To investigate the formation and properties of self-assembled nanofibers derived from a modified peptide.
  • To explore the potential of these nanofibers as cell-compatible biomaterials.

Main Methods:

  • Conjugation of a structured phosphorylation site motif to a self-assembling tripeptide via a glycine linker.
  • Generation of a phosphorylated octapeptide and subsequent dephosphorylation to induce hydrogel formation.
  • Cryo-electron microscopy (cryo-EM) for structural analysis of the self-assembled nanofibers.

Main Results:

  • Successfully engineered self-assembling nanofibers with intrinsic disorder from a modified peptide.
  • The resulting phosphooctapeptide is cell-compatible and forms a hydrogel upon dephosphorylation.
  • Cryo-EM revealed helical arrangements within the nanofibers, with disordered peripheries.
  • Hydrogels demonstrated reduced protein adsorption correlating with increased peptide concentration.

Conclusions:

  • This study presents the first instance of a structured random coil transitioning to an intrinsically disordered state within self-assembled peptide nanofibers.
  • The findings expand the sequence repertoire for IDPs and offer insights into engineering disordered peptide nanofibers.
  • The developed nanofibers show promise for creating cell-compatible biomaterials with tunable properties.