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Related Experiment Videos

[Endosomes and toxin translocation].

B Beaumelle1, M Alami, M P Taupiac

  • 1UMR 5539 CNRS, Département Biologie-Santé, Université Montpellier II, 34095 Montpellier.

Journal De La Societe De Biologie
|February 9, 2002
PubMed
Summary
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Different toxins like ricin, diphtheria toxin (DT), and Pseudomonas exotoxin A (PE) use unique mechanisms to enter animal cells. Understanding these toxin entry pathways is crucial for developing effective cell protection strategies.

Area of Science:

  • Cell Biology
  • Molecular Toxicology
  • Biochemistry

Background:

  • Toxins such as ricin, diphtheria toxin (DT), and Pseudomonas exotoxin A (PE) pose significant threats to animal cells.
  • The translocation of these toxins across the endosome membrane is a critical step determining their cellular toxicity.
  • Understanding these mechanisms is key to developing targeted interventions.

Purpose of the Study:

  • To investigate the distinct molecular strategies employed by ricin, DT, and PE for translocation into the cell cytosol.
  • To elucidate the role of endosomal pH, ATP hydrolysis, and protein unfolding in the toxin entry process.
  • To engineer a more potent Pseudomonas exotoxin A (PE) mutant through targeted genetic modification.

Main Methods:

  • Purification of endosomes from lymphocytes for studying toxin translocation.

Related Experiment Videos

  • Analysis of toxin entry mechanisms under varying conditions, including pH and ATP availability.
  • Utilizing dihydrofolate reductase (DHFR) conjugates to assess protein unfolding during translocation.
  • Employing a deletion approach to create and evaluate modified PE mutants.

    • Main Results:

    • Ricin translocation depends solely on cytosolic ATP hydrolysis.
    • Pseudomonas exotoxin A (PE) translocation requires initial exposure to low endosomal pH followed by ATP hydrolysis.
    • Diphtheria toxin (DT) translocation is driven by the pH gradient between the endosome and cytosol.
    • Evidence suggests ricin and PE require unfolding for membrane translocation.
    • A modified PE mutant with enhanced translocation and increased cytotoxicity was generated.

    Conclusions:

    • Ricin, DT, and PE exhibit distinct mechanisms for crossing the endosome membrane, highlighting diverse cellular entry strategies.
    • The findings provide insights into the biophysical requirements for toxin translocation, including pH, ATP, and protein conformation.
    • Engineering of PE demonstrated the potential for developing more effective toxin-based agents or countermeasures.