中国寄生虫学与寄生虫病杂志

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弓形虫复合抗原ROP2-SAG1优势表位与人乳头瘤病毒16型晚期结构蛋白L1融合体的构建及其在真核细胞中的表达

谢自新1,姜洁2,汪文寰3,吕金辉2,冯方方2,张丽芳2,李文姝2*   

  1. 温州医科大学 1 药学院,2 微生物学与免疫学教研室,温州 325032;3 温州市人民医院妇产科学重点实验室,温州 325000
  • 出版日期:2018-06-30 发布日期:2018-07-02

Construction of the RSepitope-HPV16L1 fusion protein using the dominant epitope of ROP2-SAG1 antigen from Toxoplasma gondii and late structural protein 1 of HPV type 16 and #br# its expression in eukaryotic cells

XIE Zi-xin1, JIANG Jie2, WANG Wen-huan3, LV Jin-hui2, FENG Fang-fang2, #br# ZHANG Li-fang2, LI Wen-shu2*   

  1. 1 School of Pharmacy, 2 Department of Microbiology and Immunology, Wenzhou Medical University, Wenzhou 325032, China;3 Key Laboratory of Uterology, Wenzhou People’s Hospital, Wenzhou 325000, China
  • Online:2018-06-30 Published:2018-07-02

摘要:

目的 构建弓形虫复合抗原ROP2-SAG1免疫优势表位(RSepitope)与人乳头瘤病毒16型晚期结构蛋白L1(HPV16L1)的融合体(RSepitope-HPV16L1),验证其在真核细胞中的表达。 方法 优化RSepitope基因序列,构建pcDNA3.1/RSepitope重组真核表达质粒。从T-HPV16L1质粒中扩增HPV16L1基因片段,构建pcDNA3.1/RSepitope-HPV16L1重组质粒。双酶切、PCR、测序鉴定正确后,将2个重组质粒分别转染至非洲绿猴肾细胞COS-7细胞,培养48 h后收集细胞,提取RNA,RT-PCR扩增相应的目的基因。Western blotting和间接免疫荧光实验检测重组蛋白RSepitope和RSepitope-HPV16L1在细胞中的表达。 结果 构建的重组质粒pcDNA3.1/RSepitope和pcDNA3.1/RSepitope-HPV16L1经PCR扩增和双酶切分别获得282 bp和1 500 bp片段,与预期结果一致,测序结果正确。RT-PCR结果显示,以2个重组质粒转染细胞的cDNA为模板,分别扩增到282 bp和1 500 bp的目的条带。Western blotting分析结果显示,以RSepitope免疫血清为一抗,重组蛋白RSepitope和RSepitope-HPV16L1分别在相对分子质量(Mr)约为10 000和65 000处出现特异性条带;以HPV16L1单克隆抗体为一抗,重组蛋白RSepitope-HPV16L1在Mr 65 000处出现特异性条带。间接免疫荧光实验结果显示,以RSepitope免疫血清为一抗,重组质粒pcDNA3.1/RSepitope和pcDNA3.1/RSepitope-HPV16L1转染细胞内均观察到绿色荧光;以HPV16L1单克隆抗体为一抗,重组质粒pcDNA3.1/RSepitope-HPV16L1转染细胞内观察到特异性绿色荧光。 结论 弓形虫优势表位RSepitope与HPV16L1融合体构建成功,且可在真核细胞中表达。

关键词: 弓形虫, 优势表位, 人乳头瘤病毒16型晚期结构蛋白, 表达

Abstract:

 Objective To construct the RSepitope-HPV16L1 fusion protein using the dominant epitope of ROP2-SAG1 antigen from Toxoplasma gondii (RSepitope) and late structural protein 1 of HPV type 16 (HPV16L1), and verify its expression in eukaryotic cells. Methods The recombinant plasmid pcDNA3.1/RSepitope was constructed after optimizing the RSepitope gene sequence. The gene fragment of HPV16L1 was amplified from the plasmid T-HPV16L1 preserved in our lab, and the recombinant plasmid pcDNA3.1/RSepitope-HPV16L1 was constructed. The recombinant plasmid was verified by enzymatic digestion, PCR amplification and sequencing, and transfected into the COS-7 cells. After 48 h of culture, cells were collected to extract RNA. RT-PCR was performed to amplify target genes. Meanwhile, Western blotting and indirect immunofluorescence test were performed to detect the expression of target proteins RSepitope and RSepitope-HPV16L1 in cells.  Results After amplification and enzymatic digestion, a 282-bp fragment was obtained from pcDNA3.1/RSepitope, and a 1 500 bp fragment was obtained from pcDNA3.1/RSepitope-HPV16L1. RT-PCR using cDNA of the recombinant plasmid-transfected cells as the template produced specific bands of 282 bp and 1 500 bp, respectively. Western blotting analysis showed that when the RSepitope anti-serum was used as the primary antibody, specific bands with relative Mr of 10 000 and 65 000 were seen for RSepitope and RSepitope-HPV16L1, respectively.  When anti-HPV16L1 monoclonal antibody was used as the primary antibody, a specific band with relative Mr of 65 000 was seen for RSepitope-HPV16L1. Indirect immunofluorescence analysis using RSepitope anti-serum as the primary antibody produced green fluorescence in cells transfected with pcDNA3.1/RSepitope and pcDNA3.1/RSepitope-HPV16L1. When the HPV16L1 monoclonal antibody was used as the primary antibody, green fluorescence was seen only in cells transfected with pcDNA3.1/RSepitope-HPV16L1.  Conclusion The RSepitope-HPV16L1 fusion is constructed using RSepitope and HPV16L1 and could be expressed in eukaryotic cells.

Key words:  Toxoplasma gondii, Dominant epitope, Late structural protein of human papillomavirus 16, Expression