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Related Experiment Videos

The channel-forming toxin aerolysin.

J T Buckley1

  • 1Department of Biochemistry and Microbiology, University of Victoria, British Columbia, Canada.

FEMS Microbiology Immunology
|September 1, 1992
PubMed
Summary
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Aeromonas bacteria release aerolysin, a cytolytic toxin that forms channels in cell membranes. Researchers identified key regions for toxin activation, cell binding, and oligomerization, revealing its heptameric structure.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Aeromonas species secrete proaerolysin, a cytolytic protein precursor.
  • Proaerolysin is activated by proteases to form the active aerolysin toxin.
  • Aerolysin mediates cell death by forming transmembrane channels in eukaryotic cells.

Purpose of the Study:

  • To identify critical regions of aerolysin involved in its biological activity.
  • To elucidate the structural organization and oligomeric state of aerolysin.

Main Methods:

  • Chemical modification and site-directed mutagenesis were employed.
  • Crystallography was used to determine the structure of proaerolysin and aerolysin.

Main Results:

Related Experiment Videos

  • Key molecular regions for bacterial outer membrane transfer, proteolytic activation, glycophorin binding, and oligomerization were identified.
  • A three-domain organization of proaerolysin was revealed by electron microscopy.
  • Aerolysin was shown to form heptameric oligomers.

    • Conclusions:

    • Structure-function relationships of aerolysin were elucidated.
    • The mechanism of aerolysin-induced cell lysis involves channel formation by heptameric complexes.