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Related Experiment Videos

The Clostridium perfringens alpha-toxin.

R W Titball1, C E Naylor, A K Basak

  • 1Defence Evaluation and Research Agency, CBD Porton Down, Salisbury, Wiltshire, SP4 OJQ, UK. rtiteall@dera.gov.uk

Anaerobe
|August 5, 2006
PubMed
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Clostridium perfringens alpha-toxin is a zinc phospholipase C. It is the main cause of gas gangrene, impacting neutrophil function, blood supply, and host cell metabolism.

Area of Science:

  • Microbiology
  • Toxicology
  • Biochemistry

Background:

  • The alpha-toxin (CPA) from Clostridium perfringens is a zinc-dependent phospholipase C.
  • This enzyme hydrolyzes cell membrane phospholipids, causing hemolysis.
  • CPA is a key virulence factor in gas gangrene and potentially other diseases.

Purpose of the Study:

  • To elucidate the role of alpha-toxin in gas gangrene pathogenesis.
  • To characterize the molecular structure and enzymatic activity of alpha-toxin.
  • To explore potential therapeutic applications, such as vaccine development.

Main Methods:

  • Biochemical characterization of purified alpha-toxin.
  • Analysis of toxin's enzymatic activity on phospholipids (phosphatidylcholine, sphingomyelin).

Related Experiment Videos

  • Investigation of toxin's effects on neutrophil trafficking, vascular function, and host cell metabolism (arachidonic acid cascade, protein kinase C).
  • Structural analysis of the two-domain toxin structure.

    • Main Results:

    • Alpha-toxin is a zinc-metallophospholipase C, primarily targeting phosphatidylcholine and sphingomyelin.
    • The toxin disrupts neutrophil migration, causes vasoconstriction and platelet aggregation, and modulates host cell metabolism.
    • The toxin has a two-domain structure: an amino-terminal phospholipase C active site and a carboxy-terminal lipid-binding domain.
    • The carboxy-terminal domain binds phospholipids in a calcium-dependent manner.

    Conclusions:

    • Alpha-toxin is crucial for gas gangrene pathogenesis through multiple mechanisms.
    • The carboxy-terminal domain shows promise as a protective antigen for vaccine development.
    • Targeting alpha-toxin or its functions could offer therapeutic strategies for gas gangrene and related conditions.