抗日本脑炎病毒单克隆抗体2F2重链可变区基因的克隆与鉴定

Cloning and characterization of the heavy chain variable region gene of monoclonal antibody 2F2 against Japanese encephalitis virus

目的 克隆抗日本脑炎病毒单克隆抗体2F2重链可变区（VH）基因.方法 从分泌抗日本脑炎病毒单克隆抗体2F2的杂交瘤细胞中提取总RNA,通过RT-PCR扩增重链可变区基因.凝胶回收纯化后与pMD-18T载体连接,重组载体转化于宿主菌DH5α,挑取菌落PCR鉴定后测序并进行分析.测序正确的质粒经EcoRI和XhoI酶切、纯化后的产物和原核表达载体pRSET A在SolutionI作用下连接,转化BL21（DE3）对重组质粒进行表达.经Tricine-十二烷基磺酸钠-聚丙烯酰胺凝胶电泳（SDS-PAGE）检测重链可变区表达产物的表达水平,用ELISA检测表达产物能否与日本脑炎病毒结合.结果 确定了2F2VH基因序列,长度为354 bp,编码118个氨基酸,第22位和第96位残基是维持抗体结构的半胱氨酸,含有特异性CDR1、CDR2和CDR3区域,符合鼠源性免疫球蛋白基因的特征.ELISA检测结果显示原核表达的2F2重链可变区产物可与日本脑炎病毒特异性结合.结论 获得了抗日本脑炎病毒单克隆抗体2F2重链可变区基因.

Objective To obtain the heavy chain variable region （VH） gene of monoclonal antibody 2F2 against Japanese encephalitis virus （JEV）.Methods Total RNA was isolated with Trizol from hybridoma 2F2 cells,and cDNA of VH was amplified with reverse transcription polymerase chain reaction （RT-PCR） and sequenced.The putative VH gene was expressed in E.coli,and the expressed products was detected with enzyme linked immunosorbent assay （ELISA） to determine the activity to bind JEV.Results The VH gene was 354 bp in length which encodes 118 amino acids.Tricine-sodium dodecyl sulfate-polyacrylamide gel electrophoresis （SDS-PAGE） showed that the VH gene was successfully expressed and purified from inclusion bodies.ELISA result also demonstrated that VH gene expressed products bind purified JEV.Conclusions The VH gene of monoclonal antibody 2F2 against JEV had been cloned.