Holotrichia oblita Midgut Proteins That Bind to Bacillus thuringiensis Cry8-Like Toxin and Assembly of the H-oblita Midgut Tissue Transcriptome
文献类型: 外文期刊
第一作者: Huang, Ying
作者: Huang, Ying;Shu, Changlong;Song, Fuping;Zhang, Jie;Jiang, Jian;Lai, Jinsheng;Jiang, Jian;Lai, Jinsheng;Soberon, Mario;Bravo, Alejandra;Liu, Chunqing
作者机构:
关键词: Bacillus thuringiensis;Cry8-like;Holotrichia oblita;binding proteins
期刊名称:APPLIED AND ENVIRONMENTAL MICROBIOLOGY ( 影响因子:4.792; 五年影响因子:5.26 )
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收录情况: SCI
摘要: The Bacillus thuringiensis strain HBF-18 (CGMCC 2070), containing two cry genes (cry8-like and cry8Ga), is toxic to Holotrichia oblita larvae. Both Cry8-like and Cry8Ga proteins are active against this insect pest, and Cry8-like is more toxic. To analyze the characteristics of the binding of Cry8-like and Cry8Ga proteins to brush border membrane vesicles (BBMVs) in H. oblita larvae, binding assays were conducted with a fluorescent DyLight488-labeled Cry8-like toxin. The results of saturation binding assays demonstrated that Cry8-like bound specifically to binding sites on BBMVs from H. oblita, and heterologous competition assays revealed that Cry8Ga shared binding sites with Cry8-like. Furthermore, Cry8-like-binding proteins in the midgut from H. oblita larvae were identified by pulldown assays and liquid chromatography-tandem mass spectrometry (LC-MS/MS). In addition, the H. oblita midgut transcrip-tome was assembled by high-throughput RNA sequencing and used for identification of Cry8-like-binding proteins. Eight Cry8-like-binding proteins were obtained from pulldown assays conducted with BBMVs. The LC-MS/MS data for these proteins were successfully matched with the H. oblita transcriptome, and BLASTX results identified five proteins as serine protease, transferrin-like, uncharacterized protein LOC658236 of Tribolium castaneum, ATPase catalytic subunit, and actin. These identified Cry8-like-binding proteins were different from those confirmed previously as receptors for Cry1A proteins in lepidopteran insect species, such as aminopeptidase, alkaline phosphatase, and cadherin.
分类号: Q939.9`X1
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