Identification of vip3A-type genes from Bacillus thuringiensis strains and characterization of a novel vip3A-type gene

文献类型： 外文期刊

第一作者： Song, F.

作者： Song, F.;Zhang, J.;Liu, R.;He, K.;Tan, J.;Huang, D.

作者机构：

关键词： Bacillus thuringiensis;PCR-RFLP;Spodopteraexigua;vip3A type genes;vip3Aa19

期刊名称：LETTERS IN APPLIED MICROBIOLOGY （ 影响因子：2.858； 五年影响因子：2.776 ）

ISSN： 0266-8254

年卷期： 2007 年 45 卷 4 期

页码：

收录情况： SCI

摘要： Aims: To search for novel Vip3A proteins for controlling insect pests. Methods and Results: A pair of universal primers was designed based on the conserved regions of five vip3A genes. Amplified products were digested with the HindIII and EcoR enzymes so as to confirm different restriction fragment length polymorphism (RFLP) patterns used to identify vip3A-type genes. The vip3A gene types of 606 Bacillus thuringiensis strains were screened and three patterns of RFLP were successfully identified. Two novel vip3A genes were found and one of these, vip3Aa19, was further characterized and its product was confirmed toxic to Spodoptera exigua, Helicoverpa armigera and Plutella xylostella larvae. Partial sequences of another novel vip3A-type gene were obtained that shared 83% homology with that of the vip3Af1 gene. Conclusion: A polymerase chain reaction (PCR)-RFLP system we developed could be used for identifying novel vip3A-genes from B. thuringiensis strains. A novel Vip3A protein was found to have a broader insecticidal spectrum. Significance and Impact of the study: The reported method is a powerful tool to find novel Vip3A proteins from large-scale B. thuringiensis strains. The novel Vip3A protein may be used to control insect pests or resistant insect pests by constructing genetically engineered strains or transgenic plants.

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