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Related Experiment Videos

Anthrax toxin complexes: heptameric protective antigen can bind lethal factor and edema factor simultaneously.

Ruth-Anne L Pimental1, Kenneth A Christensen, Bryan A Krantz

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

Biochemical and Biophysical Research Communications
|August 18, 2004
PubMed
Summary
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Anthrax toxin

Area of Science:

  • Microbiology
  • Biochemistry
  • Molecular Biology

Background:

  • Anthrax toxin comprises Protective Antigen (PA), Edema Factor (EF), and Lethal Factor (LF).
  • Proteolytic activation of PA(83) forms heptameric rings [PA(63)](7).
  • [PA(63)](7) facilitates EF and LF entry into host cells.

Purpose of the Study:

  • To investigate the simultaneous binding of EF and LF to the [PA(63)](7) heptamer.
  • To elucidate the stoichiometry of anthrax toxin complex formation.

Main Methods:

  • Fluorescence (Förster) resonance energy transfer (FRET) was employed.
  • EF and LF were labeled with donor/acceptor fluorophores.
  • Competitive displacement assays using unlabeled LF domains were performed.

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Main Results:

  • FRET confirmed simultaneous binding of EF and LF to [PA(63)](7).
  • Energy transfer was observed only when all three components were present.
  • Unlabeled LF competitively inhibited FRET, confirming specific interactions.

Conclusions:

  • Anthrax toxin heptamers ([PA(63)](7)) can bind both EF and LF concurrently.
  • This supports the formation of mixed ligand toxin complexes.
  • Understanding toxin assembly is crucial for developing targeted therapeutics.