Development of monoclonal antibody-based sensitive ELISA for the determination of Cry1Ie protein in transgenic plant

文献类型： 外文期刊

第一作者： Zhang, Yuwen

作者： Zhang, Yuwen;Wang, Guoying;Liu, Yunjun;Zhang, Yuwen;Zhang, Wei;Liu, Yan;Wang, Jianhua

作者机构：

关键词： Bacillus thuringiensis;Cry1Ie;Sandwich ELISA;Transgenic plant

期刊名称：ANALYTICAL AND BIOANALYTICAL CHEMISTRY （ 影响因子：4.142； 五年影响因子：3.863 ）

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收录情况： SCI

摘要： Cry1Ie is a kind of Bacillus thuringiensis (Bt) toxin protein which has a different action model than the Cry1Ab and Cry1Ac protein. The transgenic maize expressing Cry1Ie might be commercially used in the near future and it is urgent to develop a method to detect Cry1Ie protein in transgenic plants and their products. To develop an ELISA method, Cry1Ie protein was expressed in Escherichia coli strain Transetta DE3, purified with the Ni-NTA spin columns, and then validated by sequencing. Bioassay results showed that the purified Cry1Ie protein was highly toxic to the Asian corn borer. The polyclonal antibody (pAb) and the specific monoclonal antibody (mAb) 1G(4)2D(6) were generated from rabbit and mice which were immunized with Cry1Ie protein, respectively. Western blotting of crude Cry1Ie protein extracts was established by employing mAb 1G(4)2D(6), whereas the mAb 1G(4)2D(6) negligibly recognized other Bt proteins. Sandwich ELISA against Cry1Ie protein was established by coating with pAb and detecting with mAb 1G(4)2D(6). The limit of detection (LOD), the limit of quantification (LOQ), and the quantification range of the assay in different matrices of maize plant were determined as 0.27-0.51, 0.29-0.78, and 0.45-15.71 ng/mL, respectively. Recoveries of Cry1Ie protein spiked in different maize tissues ranged from 75.1 to 99.5 %. The established sandwich ELISA was verified using transgenic maize overexpressing Cry1Ie. The results in this study suggested that the established ELISA method is effective for detecting Cry1Ie protein in transgenic plants.

分类号： O65

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