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中文摘要：
为制备新型鸭源呼肠孤病毒（DRV）THll株SigmaA蛋白的多克隆抗体，本研究采用RT-PCR方法扩增DRVTHll株SigmaA的编码基因，将其克隆至原核表达载体pET-32a（＋）中，在大肠杆菌BL21（DE3）中进行诱导表达。采用SDS．PAGE和westernblot对表达产物进行鉴定。结果表明，SigmaA基因不仅可以在大肠杆菌中高水平表达，表达产物的分子量约66ku，而且表达产物能够被特异性DRV多克隆抗体识别，证明表达的SigmaA蛋白具有良好的免疫活性。以纯化的SigmaA蛋白免疫实验兔制备抗SigmaA蛋白的多克隆抗体，间接ELISA检测结果显示其效价达1：20000以上。间接免疫荧光试验表明，多克隆抗体能够特异性识别DRV的SigmaA蛋白，表明SigmaA蛋白具有良好的免疫原性。本研究为进一步研究SigmaA蛋白的功能，以及建立DRV检测方法奠定了基础。
英文摘要：
To prepare polyclonal antibody against Sigma A protein of a novel duck reovirus （DRV）, the Sigma A gene was amplified by RT-PCR and cloned into the pET-32a（＋） vector. The resultant recombinant plasmid was transformed into E.coli BL21 （DE3） to express with IPTG induction. The SDS-PAGE analysis showed that the expressed product was about 66ku which was recognized by antiserum of DRV TH-11 reovirus by western blot. The polyclonal antibody was prepared from the rabbit immunized with purified recombinant protein. The titer of the antibody was about 1：20,000 by detection of indirect ELISA. The indirect immunofluorescence assay also confirmed that the polyclonal antibody reacted specially with DRV Sigma A protein, which would be used for study of the Sigma A function.
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