人H5N1流感病毒M1基因的亚克隆及其在原核细胞的表达

Subcloning of M1 gene fragment of H5N1 Influenza virus and its expression in Escherichia coli

目的 构建人H5N1亚型禽流感病毒A/Anhui/1/2005 M1蛋白的原核表达系统，为进一步研究M1蛋白的生物学功能和制备其诊断试剂奠定基础。方法 以该病毒基因节段七cDNA为模板，PCR扩增得到M1基因片段。将该片段亚克隆至载体pQE80-L中，构建重组质粒pQE80-L/M1，转化大肠埃希菌BL21（ DE3）。IPTG诱导重组蛋白表达。金属镍离子螯合层析纯化N末端携带多聚组氨酸标签的重组M1蛋白，免疫小鼠制备多克隆抗体。结果 获得了重组M1蛋白，能与抗H5N1亚型流感病毒血清发生特异性结合，且其免疫后能诱导机体产生特异性抗体。结论 成功获得了人H5N1亚型禽流感病毒M1蛋白在原核细胞中高效表达。

Objective To generate the Escherichia coli vector expressing human H5N1 influenza virus M1 protein. To provide useful tools for detection of human H5N1 influenza virus and study on biological function of M1 protein. Methods M1 gene fragment was amplified by PCR using the influenza virus gene segment 7 as template, and was subcloned into pQE80-L vector. The recombinant plasmid pQE80-L/M1 was transformed into Escherichia coli BL21 （ DE3 ） strain. The expression of M1 was induced by isopropy-β-Dthiogalactopyranoside. We purified the recombinant M1 protein with polyhistidine tag with Ni2＋ affinity chromatography. Mouse were immunized with the purified M1 protein for preparing antibodies against M1. Results The recombinant M1 protein was recognized by antiserum against H5N1 subtype influenza virus, elicit specific antibody in immunized animals. ConclusionThese confirmed that we successfully constructed the Escherichia coli vector expressing human H5N1 influenza virus M1 protein.