食品科学

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脱氧雪腐镰刀菌烯醇模拟表位的2 种融合蛋白的表达及其在无毒酶联免疫吸附方法中的应用

徐富勇1,2,孟 玮1,刘仁荣1,*,徐 玲1,裘雪梅1,朱立鑫1   

  1. 1.江西科技师范大学生命科学学院,江西 南昌 330013;2.南昌大学生命科学与食品工程学院,江西 南昌 330029
  • 出版日期:2014-04-25 发布日期:2014-05-13
  • 通讯作者: 刘仁荣
  • 基金资助:

    江西省自然科学基金项目(20122BAB214006);江西省教育厅科技项目(GJJ13573)

Application in Non-Toxic ELISA of Expression of Deoxynivalenol Mimotope Fusion Protein

XU Fu-yong1,2 , MENG Wei1, LIU Ren-rong1,*, XU Ling1, QIU Xue-mei1, ZHU Li-xin1   

  1. 1. School of Life Science, Jiangxi Science and Technology Normal University, Nanchang 330013, China;
    2. School of Life Sciences and Food Engineering, Nanchang University, Nanchang 330029, China
  • Online:2014-04-25 Published:2014-05-13
  • Contact: LIU Ren-rong

摘要:

脱氧雪腐镰刀菌烯醇(deoxynivalenol,DON)的模拟表位(CDON),是从噬菌体展示随机肽库中淘 选出来的七肽,可模拟DON与抗DON抗体结合。为了在酶联免疫吸附方法(enzyme linked immunosorbent assay, ELISA)中用重组蛋白替代DON偶联物,以期开发出能代替偶联DON人工抗原的无毒检测DON的ELISA方法,通 过构建重组表达载体pGEX-CDON和pC89S4-CDON,并在大肠杆菌表达系统中分别表达和纯化GST-CDON和pⅧ- CDON融合蛋白,比较测定2 种融合蛋白与抗DON抗体的结合效果。ELISA方阵滴定结果显示:纯化的融合蛋白 具有良好的反应原性。在间接竞争性ELISA中,当以融合蛋白GST-CDON为包被抗原时,检测限为31 ng/mL,线 性范围为31~500 ng/mL,IC50为194 ng/mL,加标回收率为54.1%~65.4%,变异系数为6.28%~13.37%;当以融合 蛋白pⅧ-CDON为包被抗原时,检测限为15 ng/mL,线性范围为15~500 ng/mL,IC50为94 ng/mL,加标回收率为 81.7%~89.0%,变异系数为3.15%~7.55%。

关键词: 脱氧雪腐镰刀菌烯醇, 模拟表位, 质粒, 噬菌粒

Abstract:

Deoxynivalenol (DON) mimotope, designated as CDON, is a mimicking epitope (CMRPWLQ) screened from a phagedisplayed
random peptide library. In order to replace DON conjugated toxin with non-toxic recombinant protein in ELISA, two
novel expression vectors, which were designated as plasmid pGEX-CDON and phagemid pC89S4-CDON, were used to produce
GST-CDON and pⅧ-CDON fusion proteins in E. coli. After purification, both GST-CDON and pⅧ-CDON fusion proteins showed
good reactogenicity with an anti-DON antibody in a competitive inhibition ELISA test. When GST-CDON was used as coating
antigen, the linear range of the competitive inhibition ELISA was 31–500 ng/mL with an IC50 value of 194 ng/mL, and spiked
recoveries were 54.1%–65.4%, with coefficient of variation of 6.28%–13.37%. The detection limit was 31 ng/mL. Upon using pⅧ-
CDON as coating protein, the linear range of the competitive inhibition ELISA was 15–500 ng/mL with an IC50 value of 94 ng/mL,
and spiked recoveries were 81.7%–89.0%, with coefficient of variation of 3.15%–7.55%. The detection limit was 15 ng/mL.
ELISA analysis and comparison showed that the reactogenicity and specificity of pⅧ-CDON binding to anti-DON antibody
were better than that of GST-CDON fusion protein. Therefore, pⅧ-CDON is promising for establishing an ELISA without the
application of the toxic mycotoxin conjugate.

Key words: deoxynivalenol, mimotope, plasmid, phagemid

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