Abstract
Bacillus thuringiensis strain BtMC28 was isolated from the soil sample in China. Two novel crystal protein genes were found by using the PCR-RFLP method. Moreover, the full-length sequences of two novel genes were obtained by a single oligonucleotide nested (SON)-PCR upstream and downstream strategy. Sequence analysis revealed that one gene encoded a polypeptide of 673 amino acid residues with a molecular mass of 76.3 kDa, 38% identical to Cry10Aa, and the other encoded a polypeptide of 687 amino acid residues with a molecular mass of 77.1 kDa, 74% identical to Cry30Aa. These two novel crystal protein genes were designated as cry54Aa1 and cry30Fa1 by Bt Insecticidal Crystal Proteins Nomenclature Committee, respectively. The Cry54Aa1 and Cry30Fa1 proteins retained five conserved regions commonly found in the existing Cry proteins. Cry54Aa1 protein exhibited insecticidal activities against Laphygma exigua (Lepidoptera), Helicoverpa armigera (Lepidoptera), and Aedes aegypti (Diptera) when its encoding gene was expressed in an Escherichia coli host strain.
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Acknowledgments
We are grateful to Professor Jie Zhang and Fuping Song (Institute of Plant Protection, Chinese Academy of Agricultural Sciences) for helpful suggestions. This study was supported by a grant from the National High Technology Research and Development Program of China (863 Program) (No. 2006AA02Z189).
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The authors, Furong Tan and Jun Zhu contributed equally to this work.
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Tan, F., Zhu, J., Tang, J. et al. Cloning and Characterization of Two Novel Crystal Protein Genes, cry54Aa1 and cry30Fa1, from Bacillus thuringiensis Strain BtMC28. Curr Microbiol 58, 654–659 (2009). https://doi.org/10.1007/s00284-009-9386-y
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DOI: https://doi.org/10.1007/s00284-009-9386-y