禽流感病毒H9N2血凝素基因和神经氨酸酶因在大肠杆菌中的表达

克隆、表达和鉴定禽流感病毒H9N2 HA,NA基因序列,为制备抗体和基因工程疫苗打下基础。在成功克隆禽流感病毒H9N2全长HA、NA基因并测序的基础上,将部分基因序列克隆到表达载体pET32a(+)上,全基因序列克隆到表达载体pGEX4T-1上,构建了重组表达质粒pET32a(+)/HA(截短)、pET32a(+)/NA(截短)、pGEX4T-1/HA、pGEX4T-1/NA,转化大肠杆菌BL21/rosetta,IPTG诱导表达,利用Ni2+亲和层析柱和GSTrap4B亲和层析柱对重组蛋白进行纯化,并用Western Blotting和ELISA方法检测其抗原性。结果重组蛋白在大肠杆菌中可以高效表达,SDS-PAGE显示其相对分子质量与预计大小一致。ELISA和Western Blotting实验证实,重组蛋白具有良好的抗原性。本研究成功克隆和表达了禽流感病毒H9N2 HA、NA基因序列。为禽流感病毒H9N2诊断试剂和疫苗的开发等进一步的研究奠定了基础。

Expression of the Hemagglutinin and Neuramidinase Gene of Influenza A Virus H9N2 in E. coli

To clone, express and characterize the HA and NA Protein of avian influenza A virus H9N2. On the basis of successful clone the full length HA and NA gene and sequence analysis of avian influenza A virus H9N2, we were ligated part of the gene into pET32a (+) and full of the gene into pGEX4T-1. An expression vector pET32a (+)/HA (cut), pET32a (+)/NA (cut), pGEX4T-1/HA, pGEX4T-1/NA were constructed and expressed in E. coli BL21/rosetta induced by IPTG. Recombinant protein was purified through affinity chromatography column. Western Blotting and ELISA were used to determine the antigenic of the recombinant protein. The recombinant capsid gene can be overexpressed in E. coli. SDS-PAGE result showed that the gene could express product as same as we expect. ELISA and Western Blotting result showed that the recombinant protein has good antigenic. The HA and NA protein of avian influenza virus H9N2 has been successful cloned and expressed, which could be useful for developing diagnose reagents or vaccine of H9N2.