摘要
目的原核表达甘露聚糖结合凝集素相关丝氨酸蛋白酶2(MASP-2)的CUB1、CUB2功能区蛋白,制备其功能区蛋白的多克隆抗体并进行鉴定。方法利用带有CUB1、CUB2基因片段的p GEX-6P-2原核载体诱导表达GST-CUB1和GST-CUB2融合蛋白并进行纯化,将纯化后的融合蛋白作为抗原,与Freund佐剂充分混合后免疫5周龄BALB/c雌性小鼠,制备多克隆抗体;应用Western blot法检测多克隆抗体特异性,应用ELISA检测多克隆抗体效价。结果成功表达并纯化GST-CUB1和GST-CUB2蛋白;应用其作为抗原对小鼠进行免疫后,成功制备出与其相应的多克隆抗体,且特异性强,与其他蛋白无交叉反应;间接ELISA测得CUB1抗体效价大于1∶32 000,CUB2抗体效价大于1∶16 000。结论成功制备了特异性强,效价高的GST-CUB1和GST-CUB2蛋白多克隆抗体。
Objective To express CUB1 and CUB2 functional domain proteins of mannan-binding lectin-associated serine protease-2 (MASP-2) by prokaryotic expression system, and further prepare and identify the polyclonal antibodies against these two domains. Methods The pGEX-6P-2 prokaryotic vector carrying the target gene CUB1 and CUB2 was used to prepare the recombinant protein GST-CUB1 and GST-CUB2. These two fusion proteins were purified with Glutathione SepharoseTM4B beads and then combined with Freund's adjuvant as antigens to immunize the BALB/c female mice aged 5 weeks for generating polyclonal antibodies. Subsequently, the specificity of the polyclonal antibodies was detected by Western blotting, and the titer was determined by indirect ELISA. Results The fusion proteins GST-CUB1 and GST-CUB2 were successfully expressed and purified. Their polyclonal antibodies were gained from the BALB/c mice immunized with these two proteins. The polyclonal antibodies showed high specificity with no cross-reaction with other proteins. Indirect ELISA indicated that the titer of anti-CUB1 antibody was more than 1:32 000 and anti-CUB2 antibody was more than 1:16 000. Conclusion The polyclonal antibodies against GST-CUB1 and GST-CUB2 fusion proteins were obtained respectively with high titers and strong specificity.
出处
《细胞与分子免疫学杂志》
CAS
CSCD
北大核心
2015年第5期689-692,696,共5页
Chinese Journal of Cellular and Molecular Immunology
基金
河北北方学院校级重大课题(ZD201313)
关键词
MASP-2
CUB1和CUB2功能区片段
蛋白原核表达
多克隆抗体
mannan-binding lectin-associated serine protease-2 (MASP-2)
CUB1 and CUB2 functional domains
prokaryotic expression
polyclonal antibody