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Cloning and expression of Bacillus thuringiensis cry11 crystal protein gene in Escherichia coli

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Abstract

The six most toxic Pakistani isolates of Bacillus thuringiensis (SBS Bt-23, 29, 34, 37, 45 and 47), which were previously characterized for their toxicity against larvae of mosquito, Anopheles stephensi, and the presence of cry4 gene, were used for cry11 (cry4D) gene amplification. A 1.9-kb DNA fragment of cry11 gene was PCR-amplified, cloned in expression vector pT7-7, and then used for transformation of E. coli BL21C. The optimum expression was obtained with 1 mM IPTG at 37°C for 3 h. This gene showed different percentage homologies at protein level with scattered mutations in the toxic region. Biotoxicity assay of recombinant protein showed that Cry11 of SBS Bt 45 (DAB Bt 5) was the most toxic protein against third instar larvae of mosquito, A. stephensi, and has potentiality of a bioinsecticide against mosquitoes.

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  1. School of Biological Sciences, University of the Punjab, New Campus, Lahore, 54590, Pakistan

    Dil Ara Abbas Bukhari & Abdul Rauf Shakoori

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  1. Dil Ara Abbas Bukhari
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  2. Abdul Rauf Shakoori
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Correspondence to Abdul Rauf Shakoori.

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Bukhari, D.A.A., Shakoori, A.R. Cloning and expression of Bacillus thuringiensis cry11 crystal protein gene in Escherichia coli . Mol Biol Rep 36, 1661–1670 (2009). https://doi.org/10.1007/s11033-008-9366-5

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  • DOI: https://doi.org/10.1007/s11033-008-9366-5

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