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Area of Science:

  • Medicinal chemistry
  • Biomolecular engineering
  • Peptide science

Background:

  • Disrupting protein-protein interactions is a key therapeutic strategy.
  • Helical probes can mimic protein interfaces but face challenges in stability and delivery.
  • Existing methods primarily use side-chain stapling, with limited success in capping terminal helices.

Purpose of the Study:

  • To develop a generalizable method for creating conformationally stable helical mimics.
  • To investigate the potential of dual-capped peptidomimetics for therapeutic applications.
  • To compare the stability and efficacy of dual-capped mimics against traditional stapled peptides.

Main Methods:

  • Design and synthesis of bicyclic-capped helical peptidomimetics.
  • Assessment of conformational stability using biophysical techniques.
  • Evaluation of binding affinity to target proteins (cyclins A and E).
  • Cellular uptake studies and serum proteolysis resistance assays.

Main Results:

  • The dual-capped system demonstrated unambiguous helical structure and high conformational stability.
  • Effective binding to cyclins A and E was observed.
  • The mimic exhibited significant cellular uptake.
  • Complete resistance to proteolysis in serum was achieved, outperforming hydrocarbon-stapled controls.

Conclusions:

  • Dual-capped peptidomimetics represent a novel and generalizable platform for designing helical interface probes.
  • This approach overcomes limitations of previous methods, offering enhanced stability and cell permeability.
  • The developed probes show promise for therapeutic applications targeting protein-protein interactions.