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. 1987 Mar;169(3):1017–1023. doi: 10.1128/jb.169.3.1017-1023.1987

Expression in Escherichia coli of a cloned crystal protein gene of Bacillus thuringiensis subsp. israelensis.

K M McLean, H R Whiteley
PMCID: PMC211895  PMID: 3546262

Abstract

A ca. 10-kilobase (kb) HindIII fragment of plasmid DNA from Bacillus thuringiensis subsp. israelensis was cloned into plasmid pUC9 and transformed into Escherichia coli. Extracts of the recombinant strain contained a 27-kilodalton (kDa) peptide that reacted with antibodies to a 27-kDa peptide isolated from crystals produced by B. thuringiensis subsp. israelensis. Extracts of the recombinant strain were hemolytic and toxic to Aedes aegypti larvae. Full expression of the 27-kDa peptide required the presence of a ca. 0.8-kb region of DNA located 4 kb upstream from the structural gene; the 0.8-kb region could be present in cis or trans relative to the gene and apparently acted post-transcriptionally. Analysis of maxicells showed that the 10-kb insert also coded for peptides of 67, 20, and 16 kDa; data obtained with different subclones suggest that the 20-kDa peptide is encoded in the 0.8-kb DNA region.

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Selected References

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