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Stereorandomization as a Method to Probe Peptide Bioactivity.

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Summary

Solid-phase peptide synthesis (SPPS) using racemic amino acids creates stereorandomized peptides. This method reveals new insights into peptide bioactivity, showing altered effects on antimicrobial peptides and dendrimers.

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Area of Science:

  • Chemical synthesis
  • Biochemistry
  • Drug discovery

Background:

  • Solid-phase peptide synthesis (SPPS) traditionally uses enantiomerically pure amino acids.
  • This ensures the production of peptides as single enantiomers.

Purpose of the Study:

  • To explore the synthesis and bioactivity of stereorandomized peptides using racemic amino acids.
  • To investigate the impact of stereorandomization on antimicrobial peptide and polymyxin B analogue activity.

Main Methods:

  • Solid-phase peptide synthesis (SPPS) utilizing racemic amino acids.
  • High-performance liquid chromatography (HPLC) and mass spectrometry for product characterization.
  • In vitro assays to evaluate peptide bioactivity, including antimicrobial, antibiofilm, membrane disruption, hemolysis, and cytotoxicity.

Main Results:

  • SPPS with racemic amino acids yielded stereorandomized peptides as single HPLC peaks with high efficiency.
  • Stereorandomization abolished membrane disruption but retained antibiofilm effects of α-helical antimicrobial peptides.
  • For antimicrobial peptide dendrimers, stereorandomization maintained bioactivity while reducing toxicity and increasing the therapeutic index.
  • Partially stereorandomized polymyxin B analogues retained antibacterial activity but lost membrane-disruptive and LPS-neutralizing properties.

Conclusions:

  • Stereorandomized peptides can be synthesized efficiently and characterized as single entities.
  • Stereorandomization offers a method to modulate peptide bioactivity and improve therapeutic properties.
  • The findings suggest distinct mechanisms for different peptide classes and identify potential new targets for polymyxin B.