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Structural basis for endotoxin neutralization by the eosinophil cationic protein.

David Pulido1, Maria Flor Garcia-Mayoral2, Mohammed Moussaoui1

  • 1Department of Biochemistry and Molecular Biology, Biosciences Faculty, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain.

The FEBS Journal
|October 4, 2016
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Summary

Eosinophil cationic protein (ECP) effectively neutralizes bacterial lipopolysaccharide (LPS), a key trigger of septic shock. This discovery paves the way for developing new LPS-neutralizing therapies based on ECP

Keywords:
antimicrobial peptidesendotoxineosinophil cationic proteinlipopolysaccharidestructure-function

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Isolation and Chemical Characterization of Lipid A from Gram-negative Bacteria
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Area of Science:

  • Immunology
  • Microbiology
  • Biochemistry

Background:

  • Gram-negative bacterial infections can cause lethal septic shock.
  • Bacterial lipopolysaccharide (LPS) is a potent immune stimulant driving this response.
  • Developing effective LPS-neutralizing agents is crucial for treating sepsis.

Purpose of the Study:

  • To investigate the LPS-neutralizing capacity of eosinophil cationic protein (ECP).
  • To identify the structural components of LPS essential for ECP-mediated neutralization.
  • To map the structural basis of the ECP-LPS interaction.

Main Methods:

  • In vitro assays assessing ECP's ability to neutralize LPS and inhibit TNF-α production in macrophages.
  • Characterization of ECP activity using truncated LPS mutants.
  • Nuclear magnetic resonance (NMR) spectroscopy to determine the ECP-LPS binding interface.

Main Results:

  • ECP demonstrates significant LPS-neutralizing activity.
  • ECP inhibits tumor necrosis factor-α production induced by LPS in human macrophages.
  • Both polysaccharide and lipid A portions of LPS are required for ECP neutralization.
  • NMR mapping identified key structural determinants for ECP-LPS interaction.

Conclusions:

  • ECP is a potent neutralizer of bacterial LPS.
  • ECP's activity is dependent on both LPS polysaccharide and lipid A components.
  • ECP represents a promising structural scaffold for novel anti-LPS therapeutic development.