Cloning and expression inEscherichia coli of entomotoxic protein gene fromBacillus thuringiensis subspecieskurstaki |
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Authors: | Rakesh Tuli Jyoti Saluja Nihal K Notani |
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Institution: | 1. Molecular Biology and Agriculture Division, Bhabha Atomic Research Centre, 400 085, Trombay, Bombay, India
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Abstract: | A plasmid borne larvicidal crystal protein gene from B.thuringiensis subspecieskurstaki was cloned inEscherichia coli using a specific 20-mer oligonucleotide probe. The gene expressed inE. coli at a high level. TransgenicE. coli cells produced large irregular bodies which looked bright under phase contrast microscopy. The phase bright bodies released
by sonic disruption of cells could be pelleted by centrifugation. Toxicity trials on the larvae ofSpodoptera litura showed that the pellet was antifeedant and toxic to the larvae. The supernatant was only mildly antifeedant. Even short term
feeding of larvae on the toxin delayed the onset of pupation. |
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Keywords: | Bacillus thuringiensis delta-endotoxin gene cloning and expression lepidopteran toxin Spodoptera toxin parasporal crystal protein toxin gene |
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