J4 ›› 2010, Vol. 36 ›› Issue (5): 882-886.

• 基础研究 • 上一篇    下一篇

重组人酸性成纤维细胞生长因子-穿膜肽融合蛋白的克隆表达、纯化及活性检测

张睿1,2, 王晓杰1, 王怡3, 田海山1, 焦悦1,2, 高丽昌1, 李婷婷1, 李校堃1,3   

  1. 1.吉林农业大学 生物反应器与药物开发教育部工程研究中心,吉林 长春 130118; 2.吉林农业大学中药材学院,吉林 长春 130118; 3.温州医学院,浙江 温州 325000
  • 收稿日期:2010-04-19 出版日期:2010-09-28 发布日期:2010-09-28
  • 通讯作者: 李校堃(Tel:0431-84533348,E-mail:xiaokunli@163.net) E-mail:xiaokunli@163.net
  • 作者简介:张 睿(1983-)|女|吉林省辽源市人|在读医学硕士|主要从事基因工程制药的研究。
  • 基金资助:

    国家863计划项目资助课题(2007AA100503);教育部科技创新工程重大项目-培养资金项目资助课题(70S018);吉林省科技发展计划项目资助课题(20070922)

Cloning,expression,purification and bioactivity assay of fusion protein of rhaFGF-tat

ZHANG Rui1,2, WANG Xiao-Jie1, WANG Yi3, TIAN Hai-Shan1, JIAO Yue1,2, GAO Li-Chang1, LI Ting-Ting1, LI Jiao-Kun1,3   

  1. 1.Engineering Research Center of Bioreactor and Pharmaceutical Development|Ministry of Education,Jilin Agricultural University,Changchun 130118,China;2.College of Traditional Chinese Medicine,Jilin Agricultural University,Changchun 130118,China;3.Wenzhou Medical College,Wenzhou 325000,China
  • Received:2010-04-19 Online:2010-09-28 Published:2010-09-28

摘要:

目的:高效表达并纯化具有生物学活性的重组人酸性成纤维细胞生长因子(aFGF)-穿膜肽(tat)融合蛋白,为进一步开发基因工程药物提供实验依据。方法:通过双酶切方法,从质粒pMD18-T-aFGF-tat中获得aFGF-tat基因片段,并将aFGF-tat融合基因与原核表达载体pET3c连接后转化到大肠杆菌BL21(DE3)宿主细胞中,通过IPTG诱导获得可溶性表达,将融合蛋白经CM离子交换层析与肝素亲和层析纯化,MTT法检测aFGF-tat融合蛋白对NIH 3T3细的促增殖作用。结果:经酶切和基因测序证实获得的重组人aFGF-tat基因序列与GenBank报道的完全一致,构建的pET3c-aFGF-tat表达载体在大肠杆菌BL21(DE3)中成功表达aFGF-tat融合蛋白,蛋白表达量在15%以上,经SDS-PAGE证实其相对分子质量与理论预期值相符,经CM离子交换层析与肝素亲和层析纯化后蛋白纯度高于95%,Western  blotting分析表达产物与人aFGF多克隆抗体具有特异结合能力,并能够促进NIH 3T3细胞增殖。结论:成功表达重组人aFGF-tat融合蛋白工程菌,获得aFGF-tat纯蛋白,并证实aFGF-tat融合蛋白具有促细胞增殖活性。

关键词: 酸性成纤维细胞生长因子;穿膜肽;表达;纯化;活性检测

Abstract:

Abstract:Objective
To express and purify the fusion protein of rhaFGF-tat with biological activity,and provide a foundation for development of an genetically engineered drug. Methods The aFGF-tat gene fragment through digesting the pMD18-T-aFGF-tat was obtained,then the recombinant plasmid was transformed into E.coil BL21 (DE3) and induced by IPTG. The protein was purified by CM-Sepharose FF cation exchange and heparin-Sepharose FF affinity. The activity of aFGF-tat was detected with NIH 3T3 proliferation assay. Results Acquired gene fragments of aFGF-tat  identified by digestion and DNA sequencing were coincident with the human aFGF-tat reported in GenBank. The recombinant vector of pET3c-aFGF-tat was constructed successfully. SDS-PAGE result proved that aFGF-tat fusion protein with a relative molecular mass of about 19 102 was expressed. The purity of fusion protein was more than 95%,Western blotting results showed that the expressed products had specific reaction with anti-human aFGF polyclonal antibody and was able to promote the proliferation of NIH 3T3 cells. Conclusion aFGF-tat fusion gene is expressed in E.coil and purified successfully,and the aFGF-tat fusion protein can promote the proliferation of cells.

 

Key words: acidic fibroblast growth factor;transcriptional activator protein;expression;purification;activity assay

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