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Aggregation-State Dynamics Drive Double Cooperativity Between Antimicrobial Peptides LL-37 and HNP1.

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The combination of antimicrobial peptides LL-37 and HNP1 shows enhanced efficacy and reduced toxicity. Their aggregation state, regulated by lipid composition, determines membrane damage, selectively targeting bacteria over human cells.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Antimicrobial Research

Background:

  • Antimicrobial resistance necessitates novel therapeutic strategies.
  • LL-37 and HNP1 peptides exhibit a synergistic effect, enhancing antimicrobial activity and reducing host cell toxicity.
  • The underlying molecular mechanisms of this cooperative effect remain largely unexplored.

Purpose of the Study:

  • To elucidate the molecular mechanism behind the synergistic antimicrobial activity of LL-37 and HNP1.
  • To investigate how peptide aggregation influences membrane toxicity and cell fate.
  • To explore the role of lipid composition in regulating peptide aggregation and selective membrane disruption.

Main Methods:

  • Total Internal Reflection Fluorescence (TIRF) microscopy
  • Förster Resonance Energy Transfer (FRET)
  • Nuclear Magnetic Resonance (NMR) spectroscopy
  • Molecular Dynamics (MD) simulations

Main Results:

  • The cooperative effect is attributed to the dynamic assembly and disassembly of LL-37/HNP1 aggregates.
  • Peptide aggregation state directly correlates with membrane toxicity, influencing cell fate.
  • Hydrophobic interactions between LL-37 and HNP1 drive peptide aggregation.
  • Anionic lipids in membranes are crucial for disaggregating peptides, restoring antimicrobial function.
  • This lipid-dependent regulation enables selective destruction of bacterial membranes while sparing eukaryotic cells.

Conclusions:

  • The dynamic aggregation of LL-37 and HNP1 is the key to their synergistic antimicrobial action and reduced cytotoxicity.
  • Lipid composition acts as a critical regulator, enabling targeted membrane disruption.
  • This mechanism offers a promising avenue for developing advanced antibiotics against resistant bacteria.