HIV-1 C亚型Gp120蛋白表达、纯化及其抗体制备的研究

目的 制备HIV-1 C亚型Gp120蛋白及其抗体.方法 用PCR技术从表达C亚型HIV-1全长gp16O基因的质粒上扩增gP120基因羧基末端部分片段,其长度为612个核苷酸,编码204个氨基酸.将测序鉴定正确的gp120基因片段克隆到原核表达载体pET-30a上,以包涵体的形式在大肠埃希菌BL21(DE3)中高效表达,Gp120蛋白C端融合6×His标签便于纯化.将纯化的蛋白免疫新西兰大白兔制备C亚型Gp120特异性兔多克隆抗体,用间接ELISA法测定抗体滴度,并用Western Blot方法验证该抗体是否可识别在哺乳动物细胞内表达的C亚型Gp160蛋白.结果 成功地获得高纯度的C亚型Gp120融合蛋白,用其制备的多克隆抗体滴度可达1:204 800,该抗体可特异性识别在COS-1细胞中瞬时表达的C亚型Gp160蛋白.结论 获得了高纯度的C亚型Gp120融合蛋白及其高效价的抗体.

Expression and purification of HIV-1 subtype C Gp120, and its antibodies preparation

Objective To prepare H1V-1 subtype C Gp120 protein and to produce its polyelonal antibodies.Methods A C-terminal fragment of gp120 gene was amplified by PCR from a plasmid expressing full- length HIV-1 subtype C gp160 gene. The length of the subtype C gp120 fragment was 612 nt and it encodes 204 amino acid residues. The resulting DNA construct was cloned into a prokaryotic expression vector (pET-30a) and recombinant pET-3Oa-gp120 was expressed in Escherichia coli BL21 (DE3) as an insoluble protein. The vector also contained a six-histidine (His6) tag at the C-terminus for convenient purification. To produce subtype CGp120-specific polyelonal antibodies, New-Zealand rabbit was immunized with the purified Gp120 protein. Serum samples were tested by enzyme-linked immunosorbont assays (ELISA) to determine the level of antibodies. And Western blotting was used to further verify whether the polyclonal antibodies could specifically recognize subtype C Gp160 protein expressed in mammalian cells.Results HIV-1 subtype C Gp120 protein was successfully acquired and the titer of its polyclonal antibodies was 1 : 204 800. The polyclonal antibodies efficiently recognized Subtype C Gp160 protein expressed in COS-1 cells.Conclusion HIV-1 subtype C Gp120 fusion protein with high purity was obtained and its corresponding polyclonal antibodies with high titer were produced.