广州医药 ›› 2017, Vol. 48 ›› Issue (4): 38-41.DOI: 10.3969/j.issn.1000-8535.2017.04.009

• 论著 • 上一篇    下一篇

肠道病毒71型VP3结构蛋白的原核表达

肖密丝, 张莹莹, 郭敏, 许甜甜, 王长兵, 朱冰   

  1. 广州市妇女儿童医疗中心中心实验室(广州 510120)
  • 收稿日期:2017-02-21 发布日期:2021-12-01
  • 通讯作者: 朱冰,E-mail:zhubing2016@hotmail.com

Optimization of prokaryotic expression of enterovirus 71 VP3 capsid protein

XIAO Misi, ZHANG Yingying, GUO Min, XU Tiantian, WANG Changbing, ZHU Bing   

  1. Central Laboratory, Guangzhou Women and Children's Medical Center, Guangzhou 510120, China
  • Received:2017-02-21 Published:2021-12-01

摘要: 目的 利用大肠杆菌原核表达系统优化表达纯化肠道病毒71型(EV71)VP3结构蛋白,为后续单克隆抗体制备及检测试剂盒研发提供前期基础。方法 采用PCR方法扩增EV71病毒VP3基因,将其插入表达载体pET28a(+),构建pET28a-VP3重组质粒,转化大肠杆菌BL21(DE3)菌株,分别在25 ℃、37 ℃下经IPTG诱导表达,重组表达的蛋白产物经凝胶电泳初步分析,比较不同温度诱导表达的蛋白产物。结果 成功构建pET28a-VP3重组质粒,不同温度下诱导表达的蛋白产物在30.5 kDa左右位置均出现目的条带;37 ℃下诱导表达的蛋白超声破碎并离心后,目的蛋白基本位于沉淀中,而25 ℃诱导表达的蛋白产物有少量目的蛋白溶解于上清液中。结论 在25 ℃或37 ℃下均能利用大肠杆菌原核表达系统有效表达EV71病毒VP3蛋白;37 ℃诱导时蛋白可融性表达低,目的蛋白获取效率较高。

关键词: 肠道病毒71型, VP3蛋白, 原核表达, pET28a

Abstract: Objective To express VP3 capsid protein of enterovirus 71 by using Escherichia coli prokaryotic expression system. Methods VP3 gene was amplified by PCR before inserted into pET28a(+) plasmid. Then the plasmid pET28a-VP3 was transformed and expressed in the Escherichia coli BL21 strain at 25 ℃ or 37 ℃. Finally the protein was analyzed by SDS-PAGE gel electrophoresis. Results The pET28a-VP3 plasmid was successfully constructed, and the EV71 VP3 protein was expressed. Supernatant of the production after ultrasonication and centrifugation got a little VP3 protein. Conclusion The EV71 VP3 protein was expressed. Expression at 25 ℃ may lead to the dissolution of the recombinant protein.

Key words: Enterovirus 71, VP3 protein, Prokaryotic expression, pET28a