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Molecular and General Genetics MGG

, Volume 219, Issue 3, pp 453–460 | Cite as

Gene cloning shows the alpha-toxin of Clostridium perfringens to contain both sphingomyelinase and lecithinase activities

  • Brigitte Saint-Joanis
  • Thierry Garnier
  • Stewart T. Cole
Article

Summary

The plc gene encoding the alpha-toxin (phospholipase C), an important virulence factor of Clostridium perfringens, has been cloned, sequenced and expressed in Escherichia coli. Transcriptional analysis of mRNAs produced in vivo by C. perfringens and E. coli, and in vitro using purified RNA polymerase from C. perfringens revealed that plc is transcribed constitutively from a single promoter situated about 100 nucleotides from the coding sequence. A T7 expression system was used to overproduce alpha-toxin in E. coli; enzymological studies with the amplified plc gene product unambiguously demonstrated that both lecithinase (phospholipase C) and sphingomyelinase activities were associated with this 43 000 dalton cytotoxin. The 370-residue alpha-toxin is haemolytic and shares sequence and functional homology with the two components of Bacillus cereus haemolysin, cereolysin AB, in which phospholipase C and sphingomyelinase activities are associated with different polypeptides.

Key words

Exotoxins Phospholipases Gene regulation Gangrene 

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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • Brigitte Saint-Joanis
    • 1
  • Thierry Garnier
    • 1
  • Stewart T. Cole
    • 1
  1. 1.Laboratoire de Génétique Moléculaire BactérienneInstitut PasteurParis Cedex 15France

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