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携带口蹄疫病毒B细胞表位的兔出血症病毒样颗粒的表达及其免疫原性研究

DOI: 10.7668/hbnxb.2015.01.023, PP. 142-149

Keywords: 兔出血症病毒,病毒样颗粒,口蹄疫病毒,B细胞表位,载体

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Abstract:

为了研究RHDV病毒样粒子作为载体提呈外源B细胞表位的能力,以兔出血症病毒(RHDV)衣壳蛋白VP60为载体,构建携带FMDVB细胞表位(FMDVVP1B细胞表位200~213aa)的VP60嵌合蛋白,研究外源基因对VP60蛋白的表达、病毒样颗粒(VLPs)的装配及免疫原性的影响。分别在RHDV衣壳蛋白的C端、N端、306和307位氨基酸之间插入外源B细胞表位(FMDVVP1B细胞表位200~213aa),得到嵌合VP60基因。利用杆状病毒表达系统表达嵌合蛋白,分别命名为VP60-2F、VP60-306F和VP60-578F。经IFA、SDS-PAGE和WesternBlot方法鉴定嵌合蛋白的表达,通过电镜观察嵌合蛋白自聚为病毒样颗粒的能力,通过动物试验研究其免疫原性。结果显示,嵌合VP60蛋白在杆状病毒表达系统中得到高效表达,可自聚形成病毒样颗粒,免疫小鼠后可以产生针对VP60和B细胞表位特异的免疫应答。该研究为嵌合VP60VLPs的形成及结构功能的研究奠定基础,同时为RHDV-VLPs作为外源B细胞表位展示载体的可行性提供依据。

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