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Characterization of the genes encoding the haemolytic toxin and the mosquitocidal delta-endotoxin of Bacillus thuringiensis israelensis

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Summary

The crystalline parasporal inclusions (crystals) of Bacillus thuringiensis israelensis (Bti), which are specifically toxic to mosquito and black fly larvae, contain three main polypeptides of 28 kDa, 68 kDa and 130 kDa. The genes encoding the 28 kDa protein and the 130 kDa protein have been cloned from a large plasmid of Bti. Escherichiacoli recombinant clones containing the 130 kDa protein gene were highly active against larvae of Aedes aegypti and Culex pipiens, while B. subtilis recombinant cells containing the 28 kDa protein gene were haemolytic for sheep red blood cells. A fragment of the Bti plasmid which is partially homologous to the 130 kDa protein gene was also isolated; it probably corresponds to part of a second type of mosquitocidal toxin gene. Furthermore, restriction enzyme analysis suggested that the 130 kDa protein gene is located on the same Bti EcoRI fragment as another kind of Bti mosquitocidal protein gene cloned by Thorne et al. (1986). Hybridization experiments conducted with the 28 kDa protein gene and the 230 kDa protein gene showed that these two Bti genes are probably present in the plasmid DNA of B. thuringiensis subsp. morrisoni (PG14), which is also highly active against mosquito larvae.

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Communicated by A. Böck

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Bourgouin, C., Klier, A. & Rapoport, G. Characterization of the genes encoding the haemolytic toxin and the mosquitocidal delta-endotoxin of Bacillus thuringiensis israelensis . Mol Gen Genet 205, 390–397 (1986). https://doi.org/10.1007/BF00338072

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