Cytotoxic activity of Bacillus thuringiensis Cry proteins on mammalian cells transfected with cadherin-like Cry receptor gene of Bombyx mori (silkworm)

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Cytotoxic activity of Bacillus thuringiensis Cry proteins on mammalian cells transfected with cadherin-like Cry receptor gene of Bombyx mori (silkworm).

Cry1Aa, an insecticidal protein produced by Bacillus thuringiensis, has been shown to bind to cadherin-like protein, BtR175, in Bombyx mori (silkworm) midgut. We previously reported three variant alleles of BtR175 (BtR175a, b and c). When transiently expressed in COS7 cells, all the three BtR175 variants bound to Cry1Aa. We stably expressed BtR175b in HEK293 cells. These BtR175b-expressing cell...

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Evolution of Bacillus thuringiensis Cry toxins insecticidal activity

Insecticidal Cry proteins produced by Bacillus thuringiensis are use worldwide in transgenic crops for efficient pest control. Among the family of Cry toxins, the three domain Cry family is the better characterized regarding their natural evolution leading to a large number of Cry proteins with similar structure, mode of action but different insect specificity. Also, this group is the better ch...

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Regulation of cry Gene Expression in Bacillus thuringiensis

Bacillus thuringiensis differs from the closely related Bacillus cereus group species by its ability to produce crystalline inclusions. The production of these crystals mainly results from the expression of the cry genes, from the stability of their transcripts and from the synthesis, accumulation and crystallization of large amounts of insecticidal Cry proteins. This process normally coincides...

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PCR Detection of cry Genes in Local Bacillus Thuringiensis Isolates

Twelve local B. thuringiensis strains are used in the study, which previously isolated from the soil of seven governorates and characterized by their high toxicity against 2 instars larvae of cotton nd leafworm (Spodoptera littoralis). The PCR amplification analysis of the 12 Bt isolates revealed the presence of amplified fragments characteristic of five different cry genes. Results showed the ...

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ژورنال

عنوان ژورنال: Biochemical Journal

سال: 2003

ISSN: 0264-6021,1470-8728

DOI: 10.1042/bj20021401