采用 RT-PCR方法从甲型鸭肝炎病毒 ZJ-V 株的 RNA 模板中扩增出2A基因,将其克隆到表达载体pET-30(+)中,经酶切和测序鉴定后转化表达宿主菌 BL21(DE3)细胞中,以 IPTG诱导表达 His-DHAV-2A 融合蛋白。结果表明:目的蛋白在1 mmol/L IPTG诱导4 h的情况下以可溶性形式表达。表达产物经 Ni 柱纯化后获得了高纯度的融合蛋白。以纯化后的 His-DHAV-2A 融合蛋白为抗原免疫白兔制备多抗,Western-blot 试验表明制备的多抗可与目的蛋白发生特异性反应。以上结果说明,DHAV的2A蛋白在大肠杆菌中成功表达,且制备的多抗血清可用于2A蛋白的表达检测。
Using the total RNA of Duck hepatitis A virus (DHAV)ZJV strain as template,2A gene was amplified by RT-PCR and sub-cloned into pET30a to construct a recombinant prokaryotic expression plasmid pET30a-2A.After sequencing,the recombinant plasmid was transformed into E.coli BL21(DE3). The transformed bacteria were induced by 1 mmol/L IPTG with 4 hour then the fusion protein was ex-pressed as a soluble.Recombinant protein was purified by Ni-NTA-Resin,and then vaccinated rabbits three times for preparation polyclonal antibody.The results of Western-blot assay indicated the prepared poly-clonal antibody reacted with target protein specificity.These results showed that 2A protein was success-fully expressed in E.coli,and the antiserum could be used for establishment methods for DHAV-2A pro-tein detection.