中文摘要：

目的 通过BL21（DE3）原核表达系统制备抗白细胞介素-4受体（IL-4R）鼠抗人单链抗体（scFv）.方法在前期研究结果的基础上优化抗IL-4R scFv序列,优化后分析scFv序列,构建重组质粒pET-32a-scFv,将该重组质粒酶切鉴定,将其转入BL21（DE3）原核表达菌进行诱导表达,并进行SDS-PAGE分析检测,对表达蛋白进行纯化和复性,通过SDS-PAGE分析抗IL-4R单链抗体的分子质量,运用Western blot检测融合蛋白的特异性.结果插入pET-32a载体的scFv序列长度761 bp,抗IL-4R单链抗体的分子质量在45 ku左右,重组蛋白具有较高的特异性.结论本实验成功构建pET32a-scFv原核表达系统,重组蛋白具有较高的免疫反应性,为进一步研究抗IL-4R单链抗体作为药物靶点提供了工作基础.

英文摘要：

Objective To construct anti-IL-4R murine anti-human single-chain variable fragment （scFvs） antibodies through BL21 （DE3） prokaryotic expression system. Methods The anti-IL-4R scFv sequence was optimizated on the basis of previous findings. The optimized scFv sequence was analyzed. The recombinant plasmid pET-32a-scFv was constructed. The recombinant plasmid was detected through enzyme identification, and was turned into BL21 （DE3） prokaryotic expression bacteria to express the pET-32a-scFv recombinant protein in E.coli BL21 （DE3）. The purification and renaturation were researched, and SDS-PAGE analysis was studied. The molecular weight of ScFv against IL-4R was analyzed by SDS-PAGE. The expression of the fusion protein was detected by Western-blot assay. Results The length of fusion gene scFv-MLT sequence was 761 bp. The molecular weight of the recombinant expression of proteins of anti-IL-4R single antibody was approximately 45 ku. The recombinant proteins showed high specificity with anti-6 × His-tag antibody. Conclusion This experiment successfully constructs pET-32a-scFv prokaryotic expression system of recombinant protein with high immune reactivity, which provides the basis for further study of anti-IL-4R single chain antibody as drug target.