丙型肝炎病毒NS3区7个抗原表位融合基因载体的构建及在真核细胞的表达

目的 建立丙型肝炎病毒非结构蛋白3（NS3）区7个辅助T细胞抗原表位融合基因的真核表达载体，并在真核细胞中表达产物，为进一步研究应用HCV NS3序列进行预防HCV感染的DNA免疫的研究创造条件。方法合成3对相互重叠的寡核苷酸引物，涵盖NS3区7个辅助T细胞抗原表位，细胞通过重叠延伸PCR方法，将它们拼接在一起构建了一个多肽融合基因，经克隆测序后，插入真核表达载体pEGFP-N3和pBuDCE中，用构建的pEGFP-DR4质粒分别转染293T和B淋巴细胞系046W，用pBuDCE-DR4质粒转染293T细胞，用Western印迹和流式细胞仪检测其表达。结果经测序证实成功的将丙型肝炎病毒NS3区7个辅助T细胞抗原表位基因序列拼接成融合基因，构建的pEGFP-DR4质粒在293T和B淋巴细胞系046W中均表达了预期的融合蛋白36kD。构建的pBuDCE-DR4质粒在293T细胞中可观察到预期的13kD的多肽融合蛋白。结论本研究建立了能够在真核细胞表达HCVNS3区7个辅助T细胞抗原表位融合基因的细胞系。

Construction of HCV NS3 epitope fusion gene vector and its expression in eukaryotic cell line

Objective To construct a fusion minigene expression vector of seven HCV NS3 epitopes and express the fusion gene in the eukaryotic cell line, in order to form a foundation for the investigation of the DNA immunization for HCV prevention. Methods Three pairs of complementary oligonucleotides primers covering all seven HCV NS3 epitopes were synthesized. Overlapping extension PCR were performed to construct the fusion rninigene and cloned in pEGFP-N3 and pBuDCE vector respectively. The fusion protein was detected by Western blotting and flow cytometric analysis. The transfection efficiency was assessed with by flow cytometric analysis. Results The HCV NS3 epitope fusion minigene was obtained and inserted into pEGFP-N3 and pBuDCE vector respectively. The recombinant plasmid pEGFP-DR4 and pBuDCE-DR4 were expressed in 293T and 046W cell lines respectively. The Western blot result indicated that the expected 36 kDa minigene/EGFP fusion product was expressed from pEGFP-DR4, while 13kDa product from pBuDCE-DR4 respectively, Conclusion The HCV NS3 epitope fusion minigene was expressed in the eukaryocyte expression system.