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Metallohelices that kill Gram-negative pathogens using intracellular antimicrobial peptide pathways.

Daniel H Simpson1, Alexia Hapeshi2, Nicola J Rogers1

  • 1Department of Chemistry , University of Warwick , Gibbet Hill Road , Coventry , CV4 7AL , UK .

Chemical Science
|February 5, 2020
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Summary

New metallohelices mimic natural antimicrobial peptides, showing potent activity against Gram-negative bacteria. These compounds offer a promising, development-friendly scaffold for antimicrobial drug discovery.

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Area of Science:

  • Supramolecular Chemistry
  • Antimicrobial Drug Discovery
  • Biophysics

Background:

  • Natural cationic antimicrobial peptides (CAMPs) are crucial for innate immunity but face development challenges.
  • Developing synthetic alternatives with similar efficacy and improved properties is a key goal in antimicrobial research.

Purpose of the Study:

  • To synthesize and characterize novel water-compatible metallohelices with CAMP-like architectures.
  • To evaluate the antimicrobial activity and mechanisms of action of these metallohelices against pathogenic bacteria.
  • To explore the potential of CAMP-inspired scaffolds for developing new antimicrobial agents.

Main Methods:

  • Self-assembly of non-peptidic organic components around iron ions to form metallohelices.
  • Antimicrobial activity assays against various bacterial strains, including Gram-negative pathogens.
  • Cellular uptake studies using E. coli, biophysical measurements, whole genome sequencing, and transcriptomic analysis to elucidate mechanisms.

Main Results:

  • Synthesized metallohelices exhibit architecture similar to CAMPs and potent, structure-dependent antibacterial activity.
  • A key compound entered E. coli cells without membrane disruption, localizing near cellular poles.
  • Mechanisms include G-quadruplex DNA binding, inhibition of DNA gyrase and topoisomerase I, and activation of cellular stress responses.

Conclusions:

  • Metallohelices represent a viable synthetic alternative to natural CAMPs for antimicrobial drug discovery.
  • The observed multi-target mechanism hinders resistance development, addressing a key challenge in antimicrobial therapy.
  • CAMP-inspired chemical scaffolds offer a realistic approach to overcoming practical barriers associated with natural CAMPs.