高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (12): 1976.

• 研究论文 • 上一篇    下一篇

可溶性人源含硒抗体酶GPx的研究

齐小杰1, 王琳1, 方芳1, 阎锡蕴2, 丁兰1, 赵大庆1, 倪嘉缵1   

  1. 1. 中国科学院长春应用化学研究所, 长春 130022;
    2. 中国科学院微生物研究所, 北京 100080
  • 收稿日期:2000-12-22 出版日期:2001-12-24 发布日期:2001-12-24
  • 通讯作者: 丁 兰(1967年出生),女,博士,副研究员,从事抗体酶研究.
  • 基金资助:

    中国科学院基础局重大项目(批准号:KJ951-A1-504-02);国家自然科学基金(批准号:29701005)资助

Studies of Soluble Human Catalytic Antibody with Glutathione Peroxidase Activity

QI XiaoJie1, WANG Lin1, FANG Fang1, YAN XiYun2, DING Lan1, ZHAO DaQing1, NI JiaZuan1   

  1. 1. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun3002 China;
    2. Institute of Microbiology, Chinese
  • Received:2000-12-22 Online:2001-12-24 Published:2001-12-24

摘要: 对噬菌体展示人单链抗体库进行筛选,得到与半抗原S-二硝基苯取代的谷胱甘肽二丁酯特异结合的单链抗体3B10.用计算机模拟分析了单链抗体的空间结构,发现抗原结合的CDR3区位于抗体的表面,推测其可能进一步参加硒化反应.利用突变引物,在大肠杆菌中表达了可溶性抗体蛋白,并用化学方法将催化必需基团硒代半胱氨酸(Sec)组装到3B10抗原结合部位,获得了具有谷胱甘肽过氧化物酶活力的人源抗体酶.动力学研究结果表明,抗体酶和天然酶一样,符合乒乓反应机制.

关键词: 谷胱甘肽过氧化物酶, 人源抗体酶, 可溶性表达

Abstract: By screening the phagedisplayed human single chain antibody library, we have got the specific single chain antibody bound to GSHSDNPbutyl ester as the hapten. The tertiary structure of the protein was analyzed with the aid of computer, and the results showed the CDR3 region located on the surface of the antibody. The soluble antibody was expressed in E.coli. and the active site serine was converted into selenocysteine with the chemical modifying method, which resulted in the catalytic antibody with GPx activity of 80 U/μmol. Furthermore, the same PingPong mechanism as the natural GPx was observed when the kinetic behavior of the antibody was studied.

Key words: Glutathione peroxidase, Human catalytic antibody, Soluble expression

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