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Serendipitous Hinge Modulation Hypothetically Reprograms Caerin 1.1-LC Antibacterial Mechanism and Gram-Negative

Zhengze Sun1, Ruixin Zhao1, Yueao Zhang1,2

  • 1Natural Drug Discovery Group, School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, UK.

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|November 27, 2025
PubMed
Summary

Researchers modified a frog antimicrobial peptide (AMP) using D-isomers, significantly boosting antibacterial activity against Gram-negative bacteria while reducing toxicity. This optimization strategy enhances the therapeutic index of novel peptide antibiotics.

Keywords:
Caerinantimicrobial peptidesdrug resistancehinge structuremechanism of action

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Area of Science:

  • Biochemistry
  • Microbiology
  • Drug Discovery

Background:

  • The diminishing efficacy of current antibiotics necessitates the development of novel antimicrobial agents.
  • Antimicrobial peptides (AMPs) are emerging as promising candidates for next-generation antibiotics due to their broad-spectrum activity.
  • Drug-resistant bacteria pose a significant global health threat, driving research into alternative therapeutic strategies.

Purpose of the Study:

  • To identify and characterize novel antimicrobial peptides from natural sources.
  • To investigate the structure-activity relationships of antimicrobial peptides, focusing on hinge structures.
  • To design and synthesize analogues with improved antibacterial efficacy and reduced toxicity.

Main Methods:

  • Isolation and identification of the antimicrobial peptide Caerin 1.1-LC from Litoria caerulea skin secretions.
  • Structure-activity relationship studies involving the design of peptide analogues with D-isomers.
  • Evaluation of antibacterial activity against Gram-negative bacteria and assessment of haemolytic activity.
  • Mechanism of action studies, including membrane potential and ATP disruption assays.
  • In vivo efficacy testing in infected larval models and in vitro lipopolysaccharide (LPS) neutralisation assays.

Main Results:

  • A novel antimicrobial peptide, Caerin 1.1-LC, was identified.
  • Incorporation of D-isomers into the hinge region enhanced antibacterial activity 8-fold against Gram-negative bacteria.
  • Haemolytic activity was significantly reduced, improving the therapeutic index by 56-fold.
  • The mechanism of action shifted from membrane disruption to a cell-penetrating-like mechanism, involving membrane potential depolarisation and ATP disruption.
  • In vivo studies confirmed the therapeutic potential of the D-analogue.

Conclusions:

  • Hinge structures are critical for the biological activity of Caerin-family antimicrobial peptides.
  • Strategic modification of hinge structures offers a viable approach for optimising peptide-based antibacterial agents.
  • The developed D-analogue represents a promising novel antibacterial agent with a significantly improved therapeutic index.