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Journal of Integrative Agriculture  2014, Vol. 13 Issue (5): 1043-1050    DOI: 10.1016/S2095-3119(13)60589-4
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Penetration of a Single Domain of Bacillus thuringiensis Cry1Ie-Domain I to a Lipid Membrane In vitro
 GUO Shu-yuan, LI Jie, CHEN Zhen , HE Kang-lai
1、School of Life Science, Beijing Institute of Technology, Beijing 100081, P.R.China
2、State Key Laboratory for Biology of Plant Diseases and Insect Pests/Institute of Plant Protection, Chinese Academy of Agricultural Sciences,
Beijing 100193, P.R.China
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摘要  Domain I of the activated Crystal protein from Bacillus thuringiensis has a seven α-helix bundle structure, which is responsible for membrane channel formation in its insecticidal mechanism. Cry1Ie is toxic to Asian corn borer, Ostrinia furnacalis (Guenée), 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.

Abstract  Domain I of the activated Crystal protein from Bacillus thuringiensis has a seven α-helix bundle structure, which is responsible for membrane channel formation in its insecticidal mechanism. Cry1Ie is toxic to Asian corn borer, Ostrinia furnacalis (Guenée), 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.
Keywords:  Bacillus thuringiensis       Cry1Ie       domain I of Cry protein       monolayer insertion  
Received: 20 March 2013   Accepted:
Fund: 

This work was funded by the National 973 Program of China (2009CB118902), the Natinoal Natural Science Foundation of China (31171911). We thank Professor Sui Sengfang from the Department of Biological Science and Biotechnology, Tsinghua University, for providing the NIMA 9000 microbalance.

Corresponding Authors:  GUO Shu-yuan, Tel: +86-10-68914495, E-mail: guosy@bit.edu.cn     E-mail:  guosy@bit.edu.cn

Cite this article: 

GUO Shu-yuan, LI Jie, CHEN Zhen , HE Kang-lai. 2014. Penetration of a Single Domain of Bacillus thuringiensis Cry1Ie-Domain I to a Lipid Membrane In vitro. Journal of Integrative Agriculture, 13(5): 1043-1050.

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