人脱嘌呤脱嘧啶核酸内切酶单克隆抗体抗原表位的鉴定及应用

目的:研究鉴定人脱嘌呤脱嘧啶核酸内切酶单克隆抗体(hAPE1 mAb)的抗原表位,并建立定量检测hAPE1的ELISA一步法。方法:设计并合成APE1-15肽阵列,鉴定hAPE1 mAb 2-G1和4-F6的抗原表位,应用三维立体结构观察软件Molsoft.ICM-Pro模拟hAPE1 mAb抗原表位的立体结构;采用改良的过碘酸钠法标记抗体,以hAPE1 mAb为捕获抗体和酶标抗体,建立hAPE1的ELISA一步检测法。结果:APE1-15肽阵列检测结果和抗原表位三维结构显示,2-G1mAb的抗原表位对应为hAPE1天然蛋白氨基酸残基序列的76-90位和109-123位,位于氧化还原区域,为构象型抗原表位;4-F6 mAb的抗原表位对应为hAPE1天然蛋白氨基酸序列的109-147位,位于DNA修复内切酶活性区。ELISA一步法检测hAPE1蛋白的线性范围为8.0~200μg/L,最低检测限为2.0μg/L。平均批内变异系数为8.67%,平均批间变异系数为12.45%,平均回收率为105.47%。结论:hAPE1 2-G1 mAb和4-F6 mAb具有不同的抗原表位,成功建立的hAPE1 ELISA一步法为简便、快速、准确检测血清中hAPE1的含量奠定了基础。

Identification of antigenic epitopes of human apurinic/apyrimidinic endonuclease monoclonal antibodies and their application

AIM:To identify the antigenic epitopes of human apurinic/apyrimidinic endonuclease monoclonal antibodies(hAPE1 mAb) and to establish a one-step ELISA for quantitative measurement of hAPE1.METHODS:APE1-15 polypeptide array was used to identify the antigenic epitopes of hAPE1 mAb.Molsoft.ICM-Pro software was used to display the three dimensions of antigenic epitopes of hAPE1 mAbs.hAPE1 mAb was labeled with HRP by modified method of sodium periodate oxdization.A one-step ELISA was established by using two hAPE...