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Generation of Human Domain Antibody Fragments as Potential Insecticidal Agents against Helicoverpa armigera by Cadherin-Based Screening

文献类型： 外文期刊

作者： Hu, Xiaodan 1 ; Zhang, Xiao 1 ; Liu, Yuan 1 ; Gao, Meijing 1 ; Lin, Manman 1 ; Xie, Yajing 1 ; Zhu, Qing 1 ; Xu, Chongxin 1 ; Liu, Xianjin 1 ; Vosloo, Dalene 2 ; Pooe, Ofentse Jacob 2 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Food Safety & Nutr,Minist Agr,Jiangsu Key La, Key Lab Control Technol & Stand Agroprod Safety &, State Key Lab Cultivat Base,Minist Sci & Technol, Nanjing 210014, Peoples R China

2.Univ KwaZulu Natal, Sch Life Sci, ZA-4000 Durban, South Africa

关键词： KEYWORDS: cadherin; target-screening; human domain antibody; insecticidal protein

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：5.895； 五年影响因子：6.048 ）

ISSN： 0021-8561

年卷期：

页码：

收录情况： SCI

摘要： ABSTRACT: New insecticidal genes and approaches for pest control are a hot research area. In the present study, we explored a novel strategy for the generation of insecticidal proteins. The midgut cadherin of Helicoverpa armigera (H. armigera) was used as a target to screen materials that have insecticidal activity. After three rounds of panning, the phage-displayed human domain antibody B1F6, which not only binds to the H. armigera cadherin CR9-CR11 but also significantly inhibits Cry1Ac toxins from binding to CR9-CR11, was obtained from a phage-displayed human domain antibody (DAb) library. To better analyze the relevant activity of B1F6, soluble B1F6 protein was expressed by Escherichia coli BL21 (DE3). The cytotoxicity assays demonstrated that soluble B1F6 induced Sf9 cell death when expressing H. armigera cadherin on the cell membrane. The insect bioassay results showed that soluble B1F6 protein (90 ??g/cm2) caused 49.5 ?? 3.3% H. armigera larvae mortality. The midgut histological results showed that soluble B1F6 caused damage to the midgut epithelium of H. armigera larvae. The present study explored a new strategy and provided a basic material for the generation of new insecticidal materials.

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