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Amide-to-Chloroalkene Substitution for Peptide Backbone Modification to Enhance Membrane Permeability.

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Chloroalkene dipeptide isosteres (CADIs) significantly enhance peptide membrane permeability and cellular uptake compared to traditional methods. This backbone modification improves lipophilicity and hydration, aiding in drug design.

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Area of Science:

  • Medicinal Chemistry
  • Biochemistry
  • Drug Delivery

Background:

  • Peptide-based therapeutics offer high specificity but face challenges with membrane permeability.
  • Enhancing peptide delivery across biological membranes is crucial for their therapeutic application.

Purpose of the Study:

  • To systematically evaluate backbone modification strategies for improving peptide membrane permeability.
  • To investigate chloroalkene dipeptide isosteres (CADIs) as effective amide bond surrogates.

Main Methods:

  • Direct comparison of CADI substitution with N-methylation, esterification, and thioamidation.
  • Mechanistic analyses including A log P calculations, HPLC profiling, and molecular dynamics simulations.
  • Application of CADI substitution to longer polar sequences and cyclic scaffolds.

Main Results:

  • CADI substitution consistently yielded the highest improvement in passive diffusion and cellular uptake.
  • Improved lipophilicity and reduced hydration were identified as key factors, not conformational changes.
  • CADI substitution maintained or enhanced RNA-binding affinity in RGG peptides.

Conclusions:

  • CADI substitution is a robust strategy for enhancing peptide membrane permeability.
  • This approach facilitates the design of peptidomimetics with improved hydrolytic stability and delivery.
  • CADIs represent a promising tool for developing advanced peptide-based therapeutics.