北京大学学报(自然科学版)

去B链羧端三肽人胰岛素原的基因构建和表达

黄春媚,陈来同,陈仁馨,胡美浩   

  1. 北京大学生命科学学院,北京,100871
  • 收稿日期:1995-03-05 出版日期:1995-11-20 发布日期:1995-11-20

Construction and Expression of the Gene for Des-terpeptide of C-terminal Human Proinsulin

HUNG Chunmei, CHEN Laitong, CHEN Renxin, HU Meihao   

  1. College of Life Sciences, Peking University, Beijing, 100871
  • Received:1995-03-05 Online:1995-11-20 Published:1995-11-20

摘要: 用改进的寡核苷酸诱导突变法将人胰岛素原基因(BCA)删除编码B链羧端三肽(28~30残基)的碱基片段,得到去B链羧端三肽胰岛素原的基因(B-3CA)。为了便于表达产物的蛋白质后加工,又用PCR的方法在B链N端起始Met与Phe密码子之间增加了编码Lys的3个碱基,得到改造后基因LB-3CA。将LB-3CA克隆到表达质粒pBV220上,在大肠杆菌系统中热诱导表达,表达率为12%。表达产物经蛋白质后加工,得到的去B链羧端三肽人胰岛素(DTEIB28~30人胰岛素)其受体活性和放免活性分别是猪胰岛素的45%和49%。

关键词: 去B链羧端三肽人胰岛素, 基因突变, 表达

Abstract: A proinsulin analog gene (B-3CA) has been constructed in which the coden of C-terminal three residues of B chain were deleted, and was recombined with pBV220, an expression vector with PR PLpromoter, Because of the difficulty to remove the N-terminal initiator methionine residue of recombinant protein in E.coli, another mutegenesiswas made by PCR to insert a Lys coden between the coden of initiator methionine and of the first residue Phe. After expressed in E.coli with the level accounting for 12% of total bacterial protein, the product was purified and processed to Desterpeptide of C-terminal human insulin which remained only 49% radioimmuno activity and 45% receptor binding activity of porcine insulin.

Key words: Des-terpeptideof C-terminal human proinsulin, mutegensis, expression

中图分类号: