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Stapled Anoplin as an Antibacterial Agent.

Monika Wojciechowska1, Julia Macyszyn1, Joanna Miszkiewicz1,2

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|December 30, 2021
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Modified anoplin peptides with hydrocarbon staples show enhanced antimicrobial activity. Specific analogs effectively target Gram-negative bacteria, including drug-resistant strains, without harming human cells.

Keywords:
amphipathic helixanoplinantibacterial peptideshydrocarbon staplingmultidrug resistance bacteriastapled anoplinstapled peptides

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Area of Science:

  • Biochemistry
  • Peptide Chemistry
  • Antimicrobial Research

Background:

  • Anoplin, a wasp venom peptide, possesses broad antimicrobial activity but requires high concentrations.
  • Its mechanism involves direct interaction with and disruption of bacterial membranes via α-helix formation.
  • Stabilizing the helical structure could enhance anoplin's bactericidal properties.

Purpose of the Study:

  • To design and synthesize anoplin analogs with hydrocarbon staples to improve antimicrobial efficacy.
  • To investigate how staple placement affects peptide charge, amphipathicity, and helical stability.
  • To evaluate the antimicrobial, hemolytic, and cytotoxic activities of the modified peptides.

Main Methods:

  • Synthesis of anoplin analogs with hydrocarbon staples at different positions.
  • Circular dichroism spectroscopy to assess α-helical conformation and stability.
  • Propidium iodide uptake assay to confirm membrane disruption in bacteria.
  • Antimicrobial testing against Gram-negative and Gram-positive bacteria, including drug-resistant strains.
  • Hemolytic assays on sheep erythrocytes and cytotoxicity assays on human embryonic kidney cells.

Main Results:

  • All stapled anoplin analogs adopted stable α-helical structures, with increased helicity correlating to improved trypsin stability.
  • Stapled analogs demonstrated enhanced antimicrobial activity compared to native anoplin against a range of bacteria.
  • Anoplin[2-6] analog showed potent activity against Gram-negative bacteria, including resistant strains, with no observed hemolytic or cytotoxic effects.
  • Anoplin[5-9] analog exhibited higher activity against Gram-positive bacteria but also displayed hemolytic and cytotoxic properties.

Conclusions:

  • Hydrocarbon stapling effectively stabilizes the helical structure of anoplin, enhancing its antimicrobial potential.
  • Modulating peptide charge, amphipathicity, and hydrophobic residue positioning via stapling allows for targeted antimicrobial activity.
  • The anoplin[2-6] analog represents a promising candidate for developing novel antibacterial agents against Gram-negative pathogens.