[Prokaryotic expression and polyclonal antibody preparation of human adenovirus type 7 DNA binding protein].

Objective: To express DNA-binding protein (DBP) of human adenovirus (HAdV) type 7 using the prokaryotic expression system, and product anti-HAdV-7 DBP rabbit polyclonal antibody. Methods: The HAdV-7 DBP gene was synthesized and cloned into prokaryotic expressing vector pET30a, and the recombinant plasmid was transformed into E. coli BL21 (DE3) competent cell. The recombinant protein DBP was expressed by induced Isopropyl-beta-D-thiogalactopyranoside (IPTG) and purified with Ni-NTA affinity column. The titer of anti-DBP polyclonal antibody produced in immunized rabbit was measured by indirect ELISA, and the specificity of the antibody was identified by Western blotting and indirect immunofluorescence assay (IFA). In addition, purified rDBP was used as coating antigen for indirect ELISA assay to detect specific IgM and IgG antibodies against DBP in the serum of children infected with HAdV. Results: The HAdV-7 DBP plasmid was constructed successfully. The purified recombinant DBP was more than 95% after purification. The titer of polyclonal antibody was 1∶1 024 000. The polyclonal antibody showed high specificity in vitro using Western blotting and IFA. The positive rate of specific anti-DBP IgM and IgG antibody in acute-phase serum samples collected from children infected with HAdV were 50.0% (19/38) and 63.2% (24/38), respectively, using indirect ELISA. Conclusion: In summary, the HAdV-7 rDBP is expressed using prokaryotic expression system, and the recombinant HAdV-7 DBP protein and the anti-DBP rabbit polyclonal antibody with high titer are prepared.目的： 原核表达人腺病毒（HAdV）7型DNA结合蛋白（DBP），制备DBP蛋白多克隆抗体。 方法： 合成HAdV-7 DBP基因并克隆至pET30a载体，转化大肠杆菌BL21（DE3）感受态细胞，IPTG诱导进行原核表达。经镍离子金属螯合层析纯化后免疫家兔制备多克隆抗体，使用间接酶联免疫吸附试验（ELISA）测定该抗体效价；使用Western blotting方法与间接免疫荧光方法（IFA）检测抗体特异性。以rDBP包被ELISA反应板使用间接ELISA对HAdV感染儿童急性期血清中抗DBP蛋白IgM和IgG抗体进行检测。 结果： 成功构建HAdV-7 DBP原核表达载体，表达的重组DBP蛋白经镍柱亲和层析纯化后纯度>95%，间接ELISA方法测得制备的多克隆抗血清的抗体效价为1∶1 024 000，Western blotting方法和IFA方法显示该抗体具有较高的特异性，间接ELISA方法检测HAdV感染儿童 急性期血清中抗DBP蛋白IgM和IgG抗体的阳性率分别为50.0%（19/38）和63.2%（24/38）。 结论： 成功构建HAdV-7 DBP蛋白的原达表达载体，获得了HAdV-7型DBP重组蛋白和高效价的兔多克隆抗体。.