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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Drug Discovery

Background:

  • Ephrin (Eph) receptors, the largest family of receptor tyrosine kinases, are implicated in development, cancer, and neurodegeneration.
  • Significant crosstalk among Eph receptors and ephrin ligands necessitates specific, high-affinity ligands for functional interrogation and modulation.

Purpose of the Study:

  • To rationally develop potent EphB2 receptor inhibitors.
  • To improve the inhibitory potency of the EphB2-specific SNEW peptide through structural stabilization.

Main Methods:

  • Rational design and synthesis of cross-linked peptide inhibitors.
  • Evaluation of over 20 cross-linkers to stabilize the polyproline II helix.
  • Structural analysis using Nuclear Magnetic Resonance (NMR) and molecular dynamics (MD) simulations.
  • Assessment of binding specificity and protease resistance.

Main Results:

  • An 11-atom cross-linker incorporating a 2,7-dimethylnaphthyl moiety yielded the most potent EphB2 inhibitor.
  • Cross-linking stabilized the polyproline II helical structure of the SNEW peptide when bound to EphB2.
  • Cross-linked variants maintained EphB2 binding specificity and exhibited cross-linker-dependent resistance to trypsin proteolysis.

Conclusions:

  • The developed cross-linked SNEW variants are potent and specific inhibitors of the EphB2 receptor.
  • This novel cyclization strategy effectively stabilizes polyproline II helical structures in peptides.
  • The approach holds potential for developing targeted therapies for diseases involving EphB2 signaling and other polyproline II helix-mediated protein-protein interactions (PPIs).