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Related Experiment Videos

Dimerization stabilizes the pore-forming toxin aerolysin in solution

F G van der Goot1, J Ausio, K R Wong

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

The Journal of Biological Chemistry
|August 25, 1993
PubMed
Summary
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Proaerolysin, a toxin from Aeromonas hydrophila, exists as a dimer. Dimer dissociation is essential for its oligomerization into an active channel-forming protein.

Area of Science:

  • Microbiology
  • Biochemistry
  • Structural Biology

Background:

  • Aerolysin is a channel-forming protein secreted by Aeromonas hydrophila.
  • It is initially secreted as an inactive protoxin (proaerolysin).
  • Understanding the structural transitions of proaerolysin is key to its activation mechanism.

Purpose of the Study:

  • To investigate the oligomeric state and structural stability of proaerolysin and aerolysin.
  • To elucidate the role of dimer dissociation in the oligomerization and activation of aerolysin.
  • To identify key residues involved in maintaining the dimeric structure.

Main Methods:

  • Analytical ultracentrifugation to determine oligomeric state.
  • Chemical cross-linking (dimethyl suberimidate) to confirm dimerization.

Related Experiment Videos

  • Circular dichroism (UV-Vis) to assess tertiary and secondary structure.
  • Hydrophobic dye binding assay (1-anilino-8-naphthalene sulfonate) to monitor structural changes.
  • Proteolytic degradation assays.
  • Site-directed mutagenesis (Trp371/373 to Leu).

    • Main Results:

    • Proaerolysin exists as a dimer in solution, confirmed by ultracentrifugation and cross-linking.
    • SDS treatment partially dissociates the dimer, altering tertiary structure and increasing hydrophobicity and protease sensitivity, but not fully unfolding.
    • Active aerolysin is also a dimer with similar stability to proaerolysin.
    • Mutations at Trp371 or Trp373 destabilized the dimer and promoted oligomerization.
    • Dimer dissociation was found to be a prerequisite for oligomerization.

    Conclusions:

    • Proaerolysin and aerolysin are dimeric proteins.
    • Partial unfolding and dimer dissociation are necessary steps for aerolysin oligomerization and activation.
    • Specific tryptophan residues (371 and 373) are critical for maintaining the dimeric stability of proaerolysin.