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Binary Encoding of Random Peptide Sequences for Selective and Differential Antimicrobial Mechanisms.

Zvi Hayouka1, Angelo Bella2, Tal Stern1

  • 1Institute of Biochemistry, Food Science and Nutrition, The Hebrew University of Jerusalem, Rehovot, 76100, Israel.

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Researchers developed binary-encoded peptide sequences that kill bacteria, including drug-resistant strains like MRSA and VRE. Chirality determines if peptides form pores or selectively target membranes, offering new antimicrobial design strategies.

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Area of Science:

  • Biochemistry
  • Microbiology
  • Materials Science

Background:

  • Antimicrobial resistance is a growing global health threat, necessitating novel therapeutic strategies.
  • Peptide-based antimicrobials offer a promising alternative to conventional antibiotics.
  • Controlling peptide assembly and membrane interactions is key to developing selective and effective agents.

Purpose of the Study:

  • To investigate the antimicrobial mechanisms of binary-encoded peptide sequences with varying chirality.
  • To determine how sequence stereochemistry influences peptide self-assembly and bacterial membrane disruption.
  • To establish a mechanistic basis for designing sequence-independent, membrane-selective antimicrobials.

Main Methods:

  • Synthesis of binary-encoded peptide sequences differing in the stereochemistry of a single amino acid.
  • Assessment of antimicrobial activity against Gram-positive and Gram-negative bacteria, including methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Enterococci (VRE).
  • Microscopy and biophysical techniques to analyze peptide self-assembly, membrane interaction, and pore formation.

Main Results:

  • All tested peptide sequences demonstrated broad-spectrum lytic activity against bacteria, including challenging resistant strains.
  • Homochiral sequences formed stable helical structures and antimicrobial pores, leading to non-specific membrane damage and hemolysis.
  • Heterochiral sequences disrupted bacterial membranes selectively without forming persistent pores or causing hemolysis.

Conclusions:

  • Peptide sequence chirality is a critical determinant of antimicrobial mechanism and selectivity.
  • Heterochiral peptide sequences offer a design strategy for targeted bacterial membrane disruption, avoiding host cell damage.
  • These findings provide a mechanistic framework for developing next-generation, sequence-independent antimicrobial agents.