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. 1988 Oct;170(10):4732–4738. doi: 10.1128/jb.170.10.4732-4738.1988

Molecular characterization of a gene encoding a 72-kilodalton mosquito-toxic crystal protein from Bacillus thuringiensis subsp. israelensis.

W P Donovan 1, C Dankocsik 1, M P Gilbert 1
PMCID: PMC211515  PMID: 2902069

Abstract

A gene encoding a 72,357-dalton (Da) crystal protein of Bacillus thuringiensis var. israelensis was isolated from a native 75-MDa plasmid by the use of a gene-specific oligonucleotide probe. Bacillus megaterium cells harboring the cloned gene (cryD) produced significant amounts of the 72-kDa protein (CryD), and the cells were highly toxic to mosquito larvae. In contrast, cryD-containing Escherichia coli cells did not produce detectable levels of the 72-kDa CryD protein. The sequence of the CryD protein, as deduced from the sequence of the cryD gene, was found to contain regions of homology with two previously described B. thuringiensis crystal proteins: a 73-kDa coleopteran-toxic protein and a 66-kDa lepidopteran- and dipteran-toxic protein of B. thuringiensis subsp. kurstaki. A second gene encoding the B. thuringiensis subsp. israelensis 28-kDa crystal protein was located approximately 1.5 kilobases upstream from and in the opposite orientation to the cryD gene.

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Selected References

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