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Optimized Zebrafish AP2M1A-Derived Decapeptide AP10RW with Robust Stability Suppresses Multidrug-Resistant Bacteria.

Yi Gong1,2, Jun Li1, Yameng Zhang1

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Summary

Researchers engineered a stable antimicrobial peptide, AP10RW, to combat drug-resistant bacteria. This peptide shows broad-spectrum efficacy and enhanced safety, offering a promising new therapeutic candidate against antimicrobial resistance.

Keywords:
antimicrobial peptidesfunctional stabilitymammalian cell safetymulti-mechanism antibacterialmultidrug-resistant bacteria

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Drug Discovery

Background:

  • Antimicrobial resistance (AMR) necessitates novel therapeutic agents beyond conventional antibiotics.
  • Previous peptide AP10 showed antimicrobial activity but lacked thermal stability.
  • Need for robust antimicrobial peptides (AMPs) effective against multidrug-resistant (MDR) pathogens.

Purpose of the Study:

  • To rationally redesign AP10 analogues for enhanced stability and maintained antimicrobial efficacy.
  • To identify and characterize an optimal AP10 analogue with broad-spectrum activity and improved robustness.
  • To evaluate the therapeutic potential of the optimized peptide against MDR bacterial infections.

Main Methods:

  • Rational redesign of ten AP10 analogues based on structure-activity relationships.
  • In vitro characterization of antimicrobial activity against drug-sensitive and MDR bacteria.
  • Assessment of peptide stability under various stress conditions (serum, pH, salt, thermal).
  • Structural analysis of peptide conformation in membrane-mimicking environments.
  • Mechanistic studies on bacterial cell membrane interaction, depolarization, and oxidative stress induction.
  • In vitro biosafety evaluation including hemolysis and cytotoxicity assays.

Main Results:

  • AP10RW identified as the optimal analogue with broad-spectrum activity against sensitive and MDR bacteria.
  • AP10RW exhibits conformational flexibility, transitioning to an amphiphilic α-helix in membrane-mimicking environments.
  • Demonstrated remarkable stability against serum, pH variations, high salt, and thermal stress.
  • Exerts bactericidal effects via multi-targeting mechanisms: binding to LTA, LPS, PGN, membrane depolarization, ultrastructural damage, and oxidative stress.
  • Exceptional biosafety profile with minimal hemolysis and low mammalian cell cytotoxicity.

Conclusions:

  • AP10RW represents a significant advancement in antimicrobial peptide engineering, transforming a thermally unstable peptide into a robust therapeutic candidate.
  • The optimized peptide AP10RW shows potent antimicrobial efficacy and superior biosafety.
  • AP10RW is a promising clinical candidate for addressing the global threat of multidrug-resistant infections.