Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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A Novel cry2Ab Gene from the Indigenous Isolate Bacillus thuringiensis subsp. kurstaki

  • Sevim, Ali (Department of Biology, Faculty of Science, Karadeniz Technical University) ;
  • Eryuzlu, Emine (Department of Biology, Faculty of Science, Karadeniz Technical University) ;
  • Demirbag, Zihni (Department of Biology, Faculty of Science, Karadeniz Technical University) ;
  • Demir, Ismail (Department of Biology, Faculty of Science, Karadeniz Technical University)
  • Received : 2011.08.24
  • Accepted : 2011.09.23
  • Published : 2012.01.28
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Abstract

A novel cry2Ab gene was cloned and sequenced from the indigenous isolate of Bacillus thuringiensis subsp. kurstaki. This gene was designated as cry2Ab25 and its sequence revealed an open reading frame of 1,902 bp encoding a 633 aa protein with calculated molecular mass of 70 kDa and pI value of 8.98. The amino acid sequence of the Cry2Ab25 protein was compared with previously known Cry2Ab toxins, and the phylogenetic relationships among them were determined. The deduced amino acid sequence of the Cry2Ab25 protein showed 99% homology to the known Cry2Ab proteins, except for Cry2Ab10 and Cry2Ab12 with 97% homology, and a variation in one amino acid residue in comparison with all known Cry2Ab proteins. The cry2Ab25 gene was expressed in Escherichia coli BL21(DE3) cells. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) revealed that the Cry2Ab25 protein is about 70 kDa. The toxin expressed in BL21(DE3) exhibited high toxicity against Malacosoma neustria and Rhagoletis cerasi with 73% and 75% mortality after 5 days of treatment, respectively.

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