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Penetration of a Single Domain of Bacillus thuringiensis Cry1Ie-Domain I to a Lipid Membrane In vitro

文献类型: 外文期刊

作者: Guo Shu-yuan 1 ; Li Jie 1 ; Chen Zhen 1 ; He Kang-lai 2 ;

作者机构: 1.Beijing Inst Technol, Sch Life Sci, Beijing 100081, Peoples R China

2.Chinese Acad Agr Sci, Inst Plant Protect, State Key Lab Biol Plant Dis & Insect Pests, Beijing 100193, Peoples R China

关键词: Bacillus thuringiensis;Cry1Ie;domain I of Cry protein;monolayer insertion

期刊名称:JOURNAL OF INTEGRATIVE AGRICULTURE ( 影响因子:2.848; 五年影响因子:2.979 )

ISSN: 2095-3119

年卷期: 2014 年 13 卷 5 期

页码:

收录情况: SCI

摘要: Domain I of the activated Crystal protein from Bacillus thuringiensis has a seven alpha-helix bundle structure, which is responsible for membrane channel formation in its insecticidal mechanism. Cry1Ie is toxic to Asian corn borer, Ostrinia furnacalis (Guenee), and plays important roles in insect biological control. The domain I from Cry1Ie has been expressed and purified in its normal conformation, as embedded in the full length homologous toxin structure. The membrane insertion ability of this single domain was compared with the full length homologous toxin using a monolayer insertion experiment. The results indicated that the Cry1Ie-domain I had the ability to insert into the lipid monolayer, and this ability is greater than that of the IE648 toxin. However, the state of insertion is not stable and remains for only a short period of time. The Cry1Ie-domain I plays no role in receptor binding as it had a nonspecific binding with the brush border membrane vesicles of the Asian corn borer.

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