Polycalin is involved in the action mechanism of Cry2Aa toxin in Helicoverpa armigera (Hubner)
文献类型： 外文期刊
作者： Wang Bing-jie 1 ; Wang Ya-nan 1 ; Wei Ji-zhen 1 ; Liu Chen 1 ; Chen Lin 1 ; Khaing, Myint Myint 1 ; Liang Ge-mei 1 ;
作者机构： 1.Chinese Acad Agr Sci, State Key Lab Biol Plant Dis & Insect Pests, Inst Plant Protect, Beijing 100193, Peoples R China
2.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Haikou 571101, Hainan, Peoples R China
3.Minist Agr, Key Lab Integrated Pest Management Trop Crops, Haikou 571101, Hainan, Peoples R China
关键词： Helicoverpa armigera; polycalin; insecticidal toxicity; antisera; binding affinity
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： 2019 年 18 卷 3 期
页码：
收录情况： SCI
摘要： Receptor proteins on the brush border membrane of the insect midgut epithelium are involved in the mode of action of insecticidal Cry proteins from Bacillus thuringiensis (Bt). Polycalin has been identified as a binding protein of the Bt Cry1Ac toxin in several Lepidoptera including Helicoverpa armigera, but its role in the action mechanism of Cry2Aa is still unclear. In this study, we investigated the binding characteristics of polycalin from the midgut of H. armigera with Cry2Aa and its role in the toxicity of Cry2Aa. The results demonstrated that heterologously expressed H. armigera polycalin peptide could bind with Cry2Aa with high affinity (K-d=32 nmol L-1). The toxicity of Cry2Aa decreased by 27% after H. armigera larvae ingested polycalin antisera. These results suggested that polycalin could be a potential functional receptor for Cry2Aa, and it plays an important role in the susceptibility of H. armigera to Cry2Aa.
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