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Related Experiment Videos

Anthrax toxin.

R John Collier1, John A T Young

  • 1Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, Massachusetts 02115, USA. jcollier@hms.harvard.edu

Annual Review of Cell and Developmental Biology
|October 23, 2003
PubMed
Summary
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Anthrax toxin uses protective antigen (PA) to deliver lethal factor (LF) and edema factor (EF) into host cells. Understanding the toxin

Area of Science:

  • Microbiology
  • Toxicology
  • Cell Biology

Background:

  • Anthrax toxin comprises three proteins: protective antigen (PA), edema factor (EF), and lethal factor (LF).
  • PA facilitates the entry of EF and LF into mammalian cells, leading to disease pathology.
  • LF is a protease, and EF is an adenylate cyclase, both contributing to bacterial virulence by inhibiting the host immune system.

Purpose of the Study:

  • To elucidate the molecular mechanisms of anthrax toxin assembly, cell entry, and cytosolic action.
  • To detail the structural basis of toxin-receptor interactions and pore formation.
  • To explore potential therapeutic strategies against anthrax infections based on toxin structure and function.

Main Methods:

  • Identification of cellular receptors for protective antigen.

Related Experiment Videos

  • Crystallographic analysis of anthrax toxin components and the PA prepore structure.
  • Investigation of toxin assembly, endocytosis, and translocation processes.

    • Main Results:

    • The identity of cellular receptors involved in anthrax toxin binding has been determined.
    • High-resolution crystallographic structures of PA, LF, EF, and the heptameric PA prepore have been obtained.
    • Detailed insights into the sequential steps of toxin assembly, pore formation, and translocation into the host cell cytosol have been gained.

    Conclusions:

    • The structure and mechanism of anthrax toxin action are now well-characterized.
    • This knowledge provides a foundation for developing novel medical countermeasures against anthrax.
    • Understanding toxin entry and function opens avenues for targeted therapeutic interventions.