不同选择剪接形式的小鼠Era在大肠杆菌中的表达及纯化  

Expression and purification of two kinds of alternative splicing mouse Era

作　　者：董轲[1] 陈苏民[1] 纪宗玲[1] 郑玉[1] 陈南春[1] 

机构地区：[1]第四军医大学基础部生物化学与分子生物学教研室,陕西西安710032

出　　处：《细胞与分子免疫学杂志》2005年第3期280-283,共4页Chinese Journal of Cellular and Molecular Immunology

基　　金：国家自然科学基金资助项目(No.39870380;39670006);全军医药卫生科研基金资助项目(No.98M108)

摘　　要：目的:对不同剪接形式的小鼠era基因(mera)进行克隆、原核表达,并进行纯化,检测抗人Era蛋白抗体对于两种剪接形式鼠Era蛋白的特异性,为以后鼠Era蛋白的研究奠定基础。方法:采用两种剪接形式era基因的MBP融合表达载体(pMAL-meraW,pMAL-meraS),在大肠杆菌中进行表达,对其进行纯化,并应用Westernblot鉴定了抗人Era蛋白抗体的特异性。结果:原核表达的MBP-mEraW、MBP-mEraS融合蛋白经过薄层扫描后发现其分别占菌体总蛋白的17%、19%;纯化后的融合蛋白纯度为67%和61%;用抗人Era蛋白抗体进行Westernblot发现抗体特异性较好,适合两种剪接形式的鼠Era蛋白的检测。结论:利用原核系统高效表达了不同剪切形式的鼠era基因,并检测了兔抗人Era蛋白抗体对不同剪接形式鼠Era蛋白的特异性,为以后对鼠era基因的研究奠定了基础。AIM: To express and purify two alternative splicing mouse Era proteins and detect whether anti-human Era antibody can be used in the study of mouse Era proteins. METHODS: Two fusion protein expression vectors, pMAL-meraW and pMAL-meraS, were constructed, then the MBP-mEra proteins were expressed in E.coli. The target proteins were purified by amylose affinity chromatography. The specificity of rabbit anti-human Era antibody to the proteins was identified by Western blot. RESULTS: The expressed MBP-mEraW and MBP-mEraS proteins constituted approximately 17% and 19% of the total bacterial proteins. The purity of the fused proteins was 67% and 61% respectively after amylose affinity chromatography. Rabbit anti-human Era antibody had high specificity to these two kinds of splicing mouse Era proteins. CONCLUSION: Two fusion mera genes could be expressed in E.coli by using gene recombination technique. The high specificity of rabbit anti-human Era antibody to the two splicing mouse ERA proteins indicates that this antibody can be used to study the function of these two kinds of splicing mouse Era.

关 键 词：小鼠era基因 基因表达 选择剪接形式 

分 类 号：Q786[生物学—分子生物学]