Signal peptide capable of efficiently directing many protein secretion in mammalian cells is one of the key elements in recombinant protein production,gene therapy and the development of DNA vaccines.In order to explo...Signal peptide capable of efficiently directing many protein secretion in mammalian cells is one of the key elements in recombinant protein production,gene therapy and the development of DNA vaccines.In order to explore the possibility of rat growth hormone signal peptide as such an element,a new vector based on the mammalian expression vector pcDNA3 was constructed by employing rat growth hormone(rGH) signal peptide as leading sequence,followed by multiple cloning sites,the myc epitope-tag and 6×his purification tag in the expression cassette.The vector was validated by successfully expressing and secretion of chick MMP-2 C-terminal PEX domain,a potential angiogenesis inhibitor,and tandem peptide repeats of myc epitope-tag in COS-7 cells.These results suggest that rat growth hormone signal peptide is effective in the mediation of recombinant protein expression and secretion,and this vector provides a new tool for universal cloning and secretion of exogenous proteins in mammalian cells.展开更多
目的重组表达类鼻疽杆菌Ⅵ型分泌系统溶血素共调节蛋白1(hemolysin coregulated protein 1,Hcp1),并对其免疫学性质进行鉴定。方法利用DNA重组技术以pET-28a表达系统在E.coli BL21(DE3)中重组表达Hcp1;通过亲和层析制备高纯度Hcp1蛋白;...目的重组表达类鼻疽杆菌Ⅵ型分泌系统溶血素共调节蛋白1(hemolysin coregulated protein 1,Hcp1),并对其免疫学性质进行鉴定。方法利用DNA重组技术以pET-28a表达系统在E.coli BL21(DE3)中重组表达Hcp1;通过亲和层析制备高纯度Hcp1蛋白;采用腹腔注射免疫小鼠制备抗Hcp1血清,ELISA检测抗体滴度,免疫印迹及免疫荧光分析抗体的免疫反应性。结果成功获得纯度达95%的重组Hcp1蛋白,该蛋白免疫小鼠后获得的抗血清具有较好的特异性和较高的抗体滴度(1∶512000),表现出良好的免疫原性和免疫反应性。结论成功制备了具有生物学活性的Hcp1重组蛋白及其抗血清。展开更多
文摘Signal peptide capable of efficiently directing many protein secretion in mammalian cells is one of the key elements in recombinant protein production,gene therapy and the development of DNA vaccines.In order to explore the possibility of rat growth hormone signal peptide as such an element,a new vector based on the mammalian expression vector pcDNA3 was constructed by employing rat growth hormone(rGH) signal peptide as leading sequence,followed by multiple cloning sites,the myc epitope-tag and 6×his purification tag in the expression cassette.The vector was validated by successfully expressing and secretion of chick MMP-2 C-terminal PEX domain,a potential angiogenesis inhibitor,and tandem peptide repeats of myc epitope-tag in COS-7 cells.These results suggest that rat growth hormone signal peptide is effective in the mediation of recombinant protein expression and secretion,and this vector provides a new tool for universal cloning and secretion of exogenous proteins in mammalian cells.
文摘目的重组表达类鼻疽杆菌Ⅵ型分泌系统溶血素共调节蛋白1(hemolysin coregulated protein 1,Hcp1),并对其免疫学性质进行鉴定。方法利用DNA重组技术以pET-28a表达系统在E.coli BL21(DE3)中重组表达Hcp1;通过亲和层析制备高纯度Hcp1蛋白;采用腹腔注射免疫小鼠制备抗Hcp1血清,ELISA检测抗体滴度,免疫印迹及免疫荧光分析抗体的免疫反应性。结果成功获得纯度达95%的重组Hcp1蛋白,该蛋白免疫小鼠后获得的抗血清具有较好的特异性和较高的抗体滴度(1∶512000),表现出良好的免疫原性和免疫反应性。结论成功制备了具有生物学活性的Hcp1重组蛋白及其抗血清。
