Bacterial Aminopeptidase-Activated Peptide Prodrug Enables Species-Selective Targeting of Pseudomonas aeruginosa

Related Experiment Video

Updated: Aug 23, 2026

Antimicrobial Peptides Produced by Selective Pressure Incorporation of Non-canonical Amino Acids
11:56

Antimicrobial Peptides Produced by Selective Pressure Incorporation of Non-canonical Amino Acids

Published on: May 4, 2018

Qingtian Gong1, Silvia Synowsky2, Aisling Lynch3,4

  • 1Biomolecular Sciences building, School of Biology, University of St Andrews, North HaughKY16 9ST, U.K.

ACS Infectious Diseases
|August 21, 2026
PubMed

Insights

New antimicrobial peptide prodrugs show promise for treating Pseudomonas aeruginosa infections. Engineered for activation by a specific bacterial enzyme, these prodrugs demonstrate targeted bacterial killing with reduced resistance potential.

Area of Science:

  • Microbiology
  • Biochemistry
  • Drug Discovery

Background:

  • Antimicrobial resistance in Pseudomonas aeruginosa necessitates novel therapeutic strategies.
  • Cationic antimicrobial peptides (AMPs) are potent but lack selectivity and can cause host toxicity.
  • Targeted activation of AMPs could overcome limitations and enhance efficacy.

Purpose of the Study:

  • To design and evaluate AMP prodrugs activated by the Pseudomonas aeruginosa enzyme PaAP for species-specific antimicrobial therapy.
  • To assess the activity of prodrugs against planktonic and biofilm forms of P. aeruginosa.
  • To investigate the mechanisms of activation and resistance development.

Main Methods:

  • Design and synthesis of two D-Bac8CLeu2,5 AMP prodrug variants (EEEE-D-Bac8CLeu2,5 and ELEG-D-Bac8CLeu2,5).
  • In vitro testing of prodrug activation by purified PaAP and P. aeruginosa strains.
  • Antimicrobial activity assays against planktonic cells and biofilms.
  • Analysis of resistance development and cross-resistance patterns.

Main Results:

  • The ELEG-D-Bac8CLeu2,5 prodrug demonstrated rapid and efficient activation by PaAP, restoring potent bactericidal activity.
  • PaAP-mediated activation was crucial for killing P. aeruginosa in biofilms, influencing kinetics.
  • The prodrug exhibited selective activity against P. aeruginosa with reduced efficacy against other ESKAPEE pathogens.
  • Distinct resistance mutations emerged for the prodrug compared to the parent AMP, indicating limited cross-resistance.

Conclusions:

  • Aminopeptidase-activated AMP prodrugs represent a viable strategy for species-selective antimicrobial therapy.
  • Exploiting bacterial enzymes like PaAP enables controlled activation of AMPs.
  • This approach offers a promising alternative for combating challenging P. aeruginosa infections and overcoming resistance.
Keywords:
Pseudomonas aeruginosaaminopeptidaseantibiofilmantimicrobial peptidebiofilmcationicprodrug

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