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Identification of cry-Type Genes on 20-kb DNA Associated with Cry1 Crystal Proteins from Bacillus thuringiensis

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Abstract

Heterologous DNA fragments (20-kb) associated with Cry1 crystal proteins (protoxins) from a soil-isolated Bacillus thuringiensis strain 4.0718 were isolated and analyzed. RFLP patterns of the PCR products showed that the 20-kb DNA fragments harbored cry1Aa, cry1Ac, cry2Aa, and cry2Ab genes. Furthermore, a 4.2-kb DNA fragment, which contained the promoter, the coding region, and the terminator of cry1Ac gene, was cloned from the 20-kb DNAs by PCR, and then the cry1Ac gene was expressed in an acrystalliferous B. thuringiensis strain 4Q7 by using E. coli-B. thuringiensis shuttle vector pHT3101. SDS-PAGE and microscopy studies revealed that the recombinant could express 130-kDa Cry1Ac protoxin and produce bipyramidal crystals during sporulation. Bioassay results proved that crystal-spore mixture from the recombinant was toxic to Plutella xylostella. This was the first report of cry-type genes present on 20-kb DNA associated with Cry1 protoxins of B. thuringiensis.

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Acknowledgments

We thank Dr. B. M. Hansen for useful suggestions and critical reading of manuscript. This investigation was supported by a NSFC grant (30270037), an 863 grant (2002AA245021), China, and a grant (KSCX2-SW-301-10) from the Chinese Academy of Sciences.

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Correspondence to Liqiu Xia.

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Xia, L., Sun, Y., Ding, X. et al. Identification of cry-Type Genes on 20-kb DNA Associated with Cry1 Crystal Proteins from Bacillus thuringiensis. Curr Microbiol 51, 53–58 (2005). https://doi.org/10.1007/s00284-005-4504-y

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