生物技术通报 ›› 2013, Vol. 0 ›› Issue (1): 134-138.

• 研究报告 • 上一篇    下一篇

GST-Smad4 融合蛋白的表达与纯化

梅竹 ,杨予涛,徐志卿   

  1. 首都医科大学基础医学院,北京 100069
  • 收稿日期:2012-07-12 修回日期:2013-01-31 出版日期:2013-01-30 发布日期:2013-01-30
  • 作者简介:梅竹,女,硕士研究生,研究方向:神经生物学;E-mail: paganinihermione@126.com
  • 基金资助:
    国家“973”计划项目( 2010CB912003),高等学校博士学科点专项科研基金项目(20101107120015),北京市属高等学校人才强教深化计划中青年骨干人才资助项目(PHR20110895),北京市优秀人才培养资助项目(2010D005018000010)

Prokaryotic Expression and Purification of GST-Smad4 Protein

Mei Zhu, Yang Yutao, Xu Zhiqing   

  1. School of Basic Medical Sciences,Capital Medical University,Beijing 100069
  • Received:2012-07-12 Revised:2013-01-31 Published:2013-01-30 Online:2013-01-30

摘要: 旨在原核表达Smad4 基因,纯化获得GST-Smad4 融合蛋白。以人表皮HaCaT 细胞的cDNA 为模板,利用PCR 扩增含有BamH I 和Sal I 酶切位点的Smad4 基因;然后将其克隆到pGEX-4T-1 原核表达载体中,将正确的重组载体转入大肠杆菌BL21(DE3);用IPTG 诱导表达,再利用MagneGST particles 亲和纯化GST-Smad4 融合蛋白;最后通过Western blot 鉴定此融合蛋白。结果显示,成功构建pGEX-4T-1-Smad4 原核表达载体;30℃条件下,0.2 mmol/L 的IPTG 能诱导出大量的可溶性GST-Smad4 蛋白;经MagneGST particles 纯化的GST-Smad4 蛋白可被Smad4 的抗体特异识别。纯化的GST-Smad4 蛋白可用于后续的生物学研究。

关键词: Smad4 , 原核表达 , 蛋白纯化

Abstract: It was to express human Smad4 gene in prokaryotic cells and purify the GST-Smad4 fusion protein. The full-length Smad4 genewas amplified by PCR and cloned into prokaryotic expression vector pGEX-4T-1. The recombinant plasmid pGEX-4T-1-Smad4 was transformedinto E.coli BL21(DE3)and exogenous protein was induced by IPTG. After purification using MagneGST particles, the GST-Smad4 fusionprotein was further identified by Western blot. Results showed that the recombinant plasmid pGEX-4T-1-Smad4 was constructed successfully.When BL21(DE3)cells transformed with pGEX-4T-1-Smad4 were cultured at 30℃ and induced with 0.2 mmol/L IPTG, GST-Smad4 proteinwas obtained in a large quantity in supernatant. The purified GST-Smad4 was further identified specifically by Smad4 antibody. Therefore, itproved that GST-Smad4 fusion protein was successfully expressed and purified, and could be used for further study of the function of Smad4.

Key words: Smad4 , Prokaryotic expression , Protein purification