华南理工大学学报(自然科学版) ›› 2005, Vol. 33 ›› Issue (1): 88-91,98.

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人酸性成纤维细胞生长因子突变体表达与修饰

郑青1 苏志坚1  吴晓萍2 许华2 黄志锋1 赵文1 姚成灿2 黄亚东1 李校堃2   

  1. 1.暨南大学 医药生物技术研究开发中心,广东 广州 510632;2.暨南大学 广东省生物工程药物重点实验室,广东 广州 510632
  • 收稿日期:2004-01-07 出版日期:2005-01-25 发布日期:2005-01-25
  • 通信作者: 郑青(1964-),男,博士,副教授,主要从事生物制药方面的研究 E-mail:qz01cn@yahoo.com.cn
  • 作者简介:郑青(1964-),男,博士,副教授,主要从事生物制药方面的研究
  • 基金资助:

    广东省自然科学基金资助项目(010424);863计划资助项目(2002AA2Z3318)

Expression and Modification of the M utant of Human Acidic Fibroblast Growth Factor

Zheng Qing1  Su Zhi-jian1  Wu Xiao-ping2  Xu Hua2  Huang Zhi-feng1  Zhao Wen1  Yao Cheng-can2  Huang Ya-dong1  Li Xiao-kun2   

  1. 1.Biopharmaeeutieal Research& Development Center,Jinan Univ.,Guangzhou 5 10632,Guangdong,China;2.Key Laboratory of Biopharmaceutics of Guangdong Province,Jinan Univ.,Guangzhou 510632,Guangdong,China
  • Received:2004-01-07 Online:2005-01-25 Published:2005-01-25
  • Contact: 郑青(1964-),男,博士,副教授,主要从事生物制药方面的研究 E-mail:qz01cn@yahoo.com.cn
  • About author:郑青(1964-),男,博士,副教授,主要从事生物制药方面的研究
  • Supported by:

    广东省自然科学基金资助项目(010424);863计划资助项目(2002AA2Z3318)

摘要: 采用聚合酶链式反应(PCR)法将人酸性成纤维细胞生长因子(haFGF)基因中编码第98位和第132位半胱氨酸(Cys)的密码子突变为编码丝氨酸(Ser)的密码子,构建重组质粒pET3c-haFGFSer98,132帆 32,转化大肠杆菌BL21(DE3),表达率达到23.48% .用M1Tr法测定产物的活性,发现haFGFSer98,132突变体的比活与天然haFGF相似.采用单甲氧基聚乙
二醇(mPEG)5000-马来酸酰亚胺酯定点修饰第3l位Cys,修饰率达到30% 以上,修饰产物的比活性保留55.53% .

关键词: 人酸性成纤维细胞生长因子, 定点突变, 突变体

Abstract:

The codons of the 98 th and the 1 32nd cysteine(Cys)of haFGF(Human Acidic Fibroblast Growth Fac-tor)cDNA Were reFIlaced with the serine(Ser)codon by means of PCR.Thus,the recombinant plasmid pET3c-haFGFSer98,132 was constructed,which was then transformed into E coli BI21(DE3),with an expression level of 23.48%.The activity of the product was detected by MTT method,with the conclusion that the mutant of haFGFSer98,132 is of an activitv similar to stan dard haFGF. Maleimide-6-aminocaproyl-mPEG5000 ester was site-directed couple to the 31 st cysteine residue of haFGFSer98,132 .The result indicates that the modification rate is up to 30% ,and the re-mained specific activity of the purified PEG-haFGFSer98,132 is 55.53% .

Key words: human acidic fibroblast growth factor, site-directed mutation, mutant