Cloning and expression in Escherichia coli of the insecticidal δ-endotoxin gene of Bacillus thuringiensis var. israelensis

  • Ward E
  • Ellar D
  • Todd J
  • 1

    Readers

    Mendeley users who have this article in their library.
  • 50

    Citations

    Citations of this article.

Abstract

Recombinant plasmids containing the mosquitocidal δ-endotoxin gene were constructed by inserting HindIII fragments of the Bacillus thuringiensis var. israelensis 72-75 Md plasmid in to the Escherichia coli vector pUC12. Two recombinants producing the 26000 Da δ-endotoxin (pIP173 and pIP174) were identified by screening clones in an E. coli in vitro transcription-translation system. Both recombinants were 12.4 kb chimaeric plasmids comprising pUC12 and a common 9.7 kb HindIII fragment of the B. thuringiensis plasmid. The 26000 Da polypeptide synthesis in vivo from pIP174 transformed into E. coli JM101 was lethal to mosquito larvae and cytotoxic to mosquito cells in vitro. The biological authenticity of the cloned product was further confirmed by demonstrating that the cytotoxicity of the polypeptide was neutralised by antiserum to the authentic δ-endotoxin or by preincubation with excess toxin receptor. Transcription of the recombinant δ-endotoxin gene in E. coli appears to utilise a Bacillus promotor sequence(s) rather than the pUC12 β-galactosidase promotor. © 1984.

Author-supplied keywords

  • Bacillus thuringiensis var. israelensis
  • Gene cloning
  • Insecticide
  • Mosquito
  • Plasmid
  • δ-Endotoxin gene

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

  • E. S. Ward

  • D. J. Ellar

  • J. A. Todd

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free