T7噬菌体衣壳蛋白P11的原核表达、纯化及其单克隆抗体的制备

Expression and purification of T7 bacteriophage capsid protein P11 and preparation of monoclonal antibody against P11

目的:表达、纯化T7噬菌体衣壳蛋白P11,并制备其单克隆抗体(mAb)。方法:克隆并表达T7噬菌体P11蛋白,其氨基端带有6-His标签。纯化后的蛋白免疫BALB/c小鼠,经融合、筛选制备特异性mAb。结果:成功表达了P11蛋白。SDS-PAGE显示所表达蛋白的相对分子质量(Mr)约为27000。获得了1株稳定分泌抗P11抗体的杂交瘤细胞株(2G11),其分泌的mAb的Ig亚类(型)为IgG2b。ELISA检测,对应腹水mAb的效价为1∶8.1×105。Western blot结果显示抗P11mAb具有良好的特异性。结论:成功地制备了P11蛋白及其mAb。

AIM： To express capsid tail protein PII of T7 bacteriophage and produce mouse monoclonal antibody （mAb） against the protein. METHODS： P11 protein was cloned and recombinant P11 protein was expressed as a fusion protein with an N-terminal 6-His tag. The purified protein was used to immunize BALB/c mouse. The specificity of mAb was analyzed by ELISA and Western blot. RESULTS： P11 protein was successfully expressed and pu- rified. SDS-PAGE analysis showed that the molecular weight of the expressed protein was approximately 27 kd. One hybridoma cell （2Gll） secreting mAb against P11 was developed. The isotype of the mAb was IgG2b. ELISA detection showed that titers of mAb was 1：8.1 × 10^5 in ascites. Western blot analysis proved mAb obtained could react specifically to the recombinant pll protein. CONCLUSION： Recombinant P11 protein and mAbs were successfully prepared.