乙型脑炎病毒 EDⅢ蛋白的表达纯化及在 Array-ELISA 方法中的应用  

Expression and purification of recombinant JEV EDⅢ protein and its application in Array-ELISA assay

作　　者：郑旸[1] 康晓平[1] 李裕昌[1] 吴晓燕[1] 张晓松[1] 杨银辉[1] 

机构地区：[1]军事医学科学院微生物流行病研究所,北京100071

出　　处：《中华微生物学和免疫学杂志》2013年第12期954-959,共6页Chinese Journal of Microbiology and Immunology

基　　金：国家科技重大专项课题（2011ZX10004-001）

摘　　要：目的：拟在大肠杆菌中高效表达纯化乙型脑炎病毒EDⅢ蛋白，希望能为乙型脑炎（乙脑）病毒（ JEV）感染血清的诊断试剂盒提供候选抗原。方法针对乙脑病毒的EDⅢ蛋白设计特异的PCR扩增引物，对提取的乙脑病毒RNA进行RT-PCR扩增，获取目的基因并构建重组质粒，将重组质粒转入E．coli BL21中并在IPTG作用下表达目的蛋白。将表达的乙型脑炎病毒EDⅢ抗原系列稀释后与对照抗原同时点制在ELISA微孔板中，采用Array-ELISA技术同时检测临床JEV感染患者及正常人血清，并与间接免疫荧光方法的检测结果进行比较。结果成功克隆了JEV EDⅢ蛋白基因段，并在E．coli BL21中表达，成功获得EDⅢ蛋白。该重组蛋白可用于Array-ELISA方法，进行JEV感染血清的检测，并且与传统免疫学检测方法---间接免疫荧光法结果一致。结论该重组抗原可作为JEV感染血清检测的候选抗原。Objective To express and purify Japanese encephalitis virus （ JEV） EDⅢprotein and evaluate the possibility of using it as a candidate antigen in JEV diagnostic kit .Methods PCR primers spe-cific for the gene encoding JEV EDⅢprotein were designed and used to amplify the gene fragment by RT-PCR.The cloned gene fragment was then inserted into pET-30a （＋） to construct the recombinant expression plasmid.The transformed E.coli BL21 carrying expression plasmid were induced by IPTG to express JEV EDⅢ protein.The expressed JEV EDⅢprotein and a control antigen of tick-borne encephalitis virus protein were deposited in small spots to set up ELISA microarray .The serum samples from patients with Japanese encephalitis and healthy people were detected by Array-ELISA.The results obtained by Array-ELISA were compared with those by using indirect immunofluorescence assay .Results The gene fragment encoding JEV EDⅢprotein was successfully cloned and expressed in E.coli BL21.The recombinant protein could be used in Array-ELISA assay for the detection of serum samples from patients with Japanese encephalitis and healthy subjects .The results were consistent with those by using indirect immunofluorescence assay.Conclusion The recombinant JEV EDⅢprotein can be used as a candidate antigen for the diagnosis of JEV infection .

关 键 词：乙型脑炎病毒 EDⅢ蛋白 克隆 Array-ELISA 

分 类 号：R512.32[医药卫生—内科学]