J4

• 基础研究 • 上一篇    下一篇

利用pET-29b载体进行葡激酶基因表达与其产物的亲和纯化

吴 樱1,黄 鹤1*,周加文2,甘一如1   

  1. 1. 天津大学化工学院生物工程系,天津300072;2. 吉林大学中日联谊医院妇产科,吉林 长春130031
  • 收稿日期:2004-07-28 修回日期:1900-01-01 出版日期:2004-11-28 发布日期:2004-11-28
  • 通讯作者: 黄 鹤

Expression and affinity purification of recombinantstaphylokinase using pET-29b vector

WU Ying1, HUANG He1*, ZHOU Jia-wen2, GAN Yi-ru1   

  1. 1. Department of Bioengineering,School of Chemical Engineering, Tianjin University, Tianjin 300072, China;2.Department of Obstetrics and Gynecology,China-Japan Union Hospital, Jilin University, Changchun 100031, China
  • Received:2004-07-28 Revised:1900-01-01 Online:2004-11-28 Published:2004-11-28
  • Contact: HUANG He

摘要: 目的:探讨6聚组氨酸序列与葡激酶基因序列融合表达及其表达产物的纯化方法。 方法:将葡激酶的cDNA序列连入pET-29b质粒,转入E.coli BL21(DE3)进行表达。 应用镍金属离子螯合层析及凝胶过滤层析法纯化表达产物,采用溶圈法对纯化产物进行生物学活性测定。 结果:6聚组氨酸与葡激酶的可溶性融合蛋白在BL21(DE3)中的表达量约占菌体可溶性蛋白总量的25%;螯合层析纯化后其纯度可达90%以上;再应用Sephacryl S-200HR可使其纯度提高到98%以上;测得其比活性为5.0×104 AU•mg-1。 结论:利用pET-29b载体成功进行了重组葡激酶基因的表达及其表达产物的亲和纯化。

关键词: 重组蛋白质类, 生物合成, 重组融合蛋白质类, 分离和纯化, 组氨酸, 色谱法, 亲和, 色谱法, 凝胶

Abstract: Objective To investigate the fusion expression of staphylokinase(SAK) gene with (His)6-tag and the purification of the expression product with Ni2+- metal chelating affinity chromatography. Methods The fragment of SAK cDNA was inserted into the pET-29b expression plasmid and the recombinant vector pET-29b-SAK was transformed into E. coli BL21(DE3) which was then induced by IPTG. The recombinant SAK-(His)6 was purified with His•Tag affinity chromatography, and its bioactivity was analyzed. Results SDS-PAGE analysis indicated that the soluble fusion protein occupied 25% of the total soluble proteins in BL21(DE3). By one-step metal chelating chromatography using Ni-IDA resin, the purity of rSAK-(His)6 was more than 90%. Then the recombinant target product obtained greater than 98% purity by the sequent exclusion chromatography using Sephacryl S-200HR. The specific activity of rSAK-(His)6 purified was more than 5.0×104 AU•mg-1.  Conclusion rSAK-(His)6 has been expressed and purified successfully using pET-29b vector.

Key words: recombinant fusion proteins, biosynthysis, recombinant fusion proteins, isolation & purification, histidine, chromatography, affinity, chromatography, gel

中图分类号: 

  • Q78