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Structure and function of anthrax toxin.

D B Lacy1, R J Collier

  • 1Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, MA 02115, USA.

Current Topics in Microbiology and Immunology
|September 13, 2002
PubMed
Summary
This summary is machine-generated.

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Anthrax toxin uses protective antigen (PA) to deliver lethal factor (LF) and edema factor (EF) into cells. This process involves significant structural changes in the toxin components for effective delivery and toxicity.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Toxicology

Background:

  • Anthrax toxin is a critical virulence factor produced by *Bacillus anthracis*.
  • It functions as a binary A-B toxin, consisting of protective antigen (PA) and two enzymatic moieties: edema factor (EF) and lethal factor (LF).
  • PA facilitates the entry of EF and LF into host cells, leading to toxicity.

Purpose of the Study:

  • To review experimental findings on the structural interactions and rearrangements involved in anthrax toxin action.
  • To achieve a molecular-level understanding of how anthrax toxin functions.

Main Methods:

  • Review of experimental data probing structural interactions.
  • Analysis of structural rearrangements during toxin delivery and translocation.

Related Experiment Videos

  • Examination of protein unfolding and refolding dynamics.

    • Main Results:

    • PA undergoes significant structural transitions: monomer to heptameric prepore to membrane-spanning pore.
    • EF and LF unfold for translocation across the endosomal membrane and refold in the cytosol.
    • Specific interactions between PA, host cell receptors, EF, and LF are crucial for intoxication.

    Conclusions:

    • The intoxication mechanism relies on dynamic structural changes of PA, EF, and LF.
    • Understanding these molecular interactions provides insight into anthrax pathogenesis.
    • Further research into these structural dynamics can inform therapeutic strategies.