Objective:To express the soluble recombinant hemangiopoietin protein in E.coli BL21(DE3).Methods:Using human fetal live cDNA as a template,a partial cDNA fragment of HAPO coding N-terminal region was subcloned into pl...Objective:To express the soluble recombinant hemangiopoietin protein in E.coli BL21(DE3).Methods:Using human fetal live cDNA as a template,a partial cDNA fragment of HAPO coding N-terminal region was subcloned into plasmids pTrc99,pQE60 and pET32c to construct different recombinant prokaryotic expression systems.After selecting,the soluble rhHAPO fusion protein was expressed stably in E.coli BL21(DE3) by vector pET32c-HAPO and further isolated by nickelnitrilotriacetic acid(NTA) affinity chromatography.After cleavage with enterokinase,the rhHAPO protein was applied to Fast Flow SP sepharose column.Results:The rhHAPO protein had a purity of more than 95% and a good bioactivity based on the cell adhesion assay in ECV304 cells.Conclusion:We have established a protein engineering system to produce rhHAPO which may provide the possibility for clinical application.展开更多
目的利用基因工程技术获得重组的人促血液血管生成素(HAPO),以探讨其对骨髓细胞的作用。方法提取人胎肝总RNA,利用RT-PCR、克隆HAPO cDNA插入表达载体pET32c,使之在大肠杆菌BL21(DE3)中表达;用DEAESepharose Fast Flow阴离子交换柱、Ni-...目的利用基因工程技术获得重组的人促血液血管生成素(HAPO),以探讨其对骨髓细胞的作用。方法提取人胎肝总RNA,利用RT-PCR、克隆HAPO cDNA插入表达载体pET32c,使之在大肠杆菌BL21(DE3)中表达;用DEAESepharose Fast Flow阴离子交换柱、Ni-Chelating Sepharose Fast Flow亲和柱以及SP Sepharose Fast Flow阳离子交换柱分离纯化,肠激酶酶切,液体培养小鼠骨髓细胞。结果经IPTG诱导HAPO实现了在大肠杆菌中的可溶性表达,经一系列层析获得融合的rh-HAPO,肠激酶酶切除去N-端融合部分后,获得高纯度的rh-HAPO。液体培养小鼠骨髓实验发现rh-HAPO可促进CD34+细胞和flk-1细胞的增殖。结论重组蛋白rh-HAPO可促进造血干/祖细胞的增殖。展开更多
基金the Natural Science Foundation of China (30300186)the Grant of 863 projects from the Ministry of Science & Technology of China (2002AA223354)
文摘Objective:To express the soluble recombinant hemangiopoietin protein in E.coli BL21(DE3).Methods:Using human fetal live cDNA as a template,a partial cDNA fragment of HAPO coding N-terminal region was subcloned into plasmids pTrc99,pQE60 and pET32c to construct different recombinant prokaryotic expression systems.After selecting,the soluble rhHAPO fusion protein was expressed stably in E.coli BL21(DE3) by vector pET32c-HAPO and further isolated by nickelnitrilotriacetic acid(NTA) affinity chromatography.After cleavage with enterokinase,the rhHAPO protein was applied to Fast Flow SP sepharose column.Results:The rhHAPO protein had a purity of more than 95% and a good bioactivity based on the cell adhesion assay in ECV304 cells.Conclusion:We have established a protein engineering system to produce rhHAPO which may provide the possibility for clinical application.
文摘目的利用基因工程技术获得重组的人促血液血管生成素(HAPO),以探讨其对骨髓细胞的作用。方法提取人胎肝总RNA,利用RT-PCR、克隆HAPO cDNA插入表达载体pET32c,使之在大肠杆菌BL21(DE3)中表达;用DEAESepharose Fast Flow阴离子交换柱、Ni-Chelating Sepharose Fast Flow亲和柱以及SP Sepharose Fast Flow阳离子交换柱分离纯化,肠激酶酶切,液体培养小鼠骨髓细胞。结果经IPTG诱导HAPO实现了在大肠杆菌中的可溶性表达,经一系列层析获得融合的rh-HAPO,肠激酶酶切除去N-端融合部分后,获得高纯度的rh-HAPO。液体培养小鼠骨髓实验发现rh-HAPO可促进CD34+细胞和flk-1细胞的增殖。结论重组蛋白rh-HAPO可促进造血干/祖细胞的增殖。