›› 2003, Vol. 46 ›› Issue (1): 114-117.

• 研究论文 • 上一篇    下一篇

死亡肽基因的合成及在大肠杆菌中的表达

翁宏飚12, 牛宝龙2, 孟智启2*, 徐孟奎1   

  • 出版日期:2003-02-20 发布日期:2003-02-20

Cloning and fusion expression of the antimicrobial peptide thanatin gene in Escherichia coli

WENG Hong-Biao1, 2, NIU Bao-Long2, MENG Zhi-Qi2*, XU Meng-Kui1   

  • Online:2003-02-20 Published:2003-02-20

摘要: 将人工合成的寡核苷酸片段,通过PCR扩增得到死亡肽(thanatin)基因,并将其克隆到表达载体pGEX-3X中,序列分析结果正确。经IPTG诱导,在大肠杆菌BL21中进行高效可溶性表达,表达量可达20%以上。融合蛋白通过GST亲和层析纯化,用肠激酶酶解表达产物,用Sephadex G-25初步纯化得到具有抗菌活性的死亡肽。

关键词: 死亡肽, 融合表达, 大肠杆菌

Abstract: The thanatin gene was obtained and inserted into expression vector pGEX-3X by a DNA recombinant method which was checked by nucleotide sequencing. The fusion protein of GST-thanatin was produced by IPTG induction in Escherichia coli (BL21). The expression level was about 20%. The fusion protein was purified by GST affinity hromatography and digested by enterokinase. Partly purified with Sephadex G-25, the final product, thanatin exhibited antimicrobial activity.

Key words: GST fusion expression, Escherichia coli