具有蛋白酶及解旋酶活性的HCV-NS3重组蛋白的纯化及活性分析

为深入探讨HCV-NS3蛋白的酶动力学性质，制备了具有蛋白酶及解旋酶活性的HCVNS3重组蛋白。利用PCR扩增HCV非结构基因NS3，插入pPIC9，测序分析。携带NS3基因的重组质粒(pPIC9-NS3)转化毕氏酵母菌菌株GS115，甲醇诱导表达NS3蛋白。重组蛋白首先采用Hitrap chelating柱进行亲和分离，之后使用Mono S HR柱进一步纯化。对纯化后的NS3重组蛋白的酶活性进行分析，结果表明，获得的重组蛋白分别具有蛋白酶及解旋酶活性。本研究为深入探讨NS3编码酶的功能和开发抗病毒药物创造条件。

Purification and Enzymatic Analysis of the Recombinant Hepatitis C Virus NonStructure Protein 3 with Protease and Helicase Activity

To study the enzymatic activity,the recombinant HCV NS3 protein with both protease and helicase activity was expressed and purified. The nonstructure gene 3 (NS3) of HCV was amplified and inserted into plasmid pPIC9 and the recombinant plasmid pPIC-NS3 was transformed into Pichia pastoris strain GS115. Recombinant protein was produced by induction of the AOX1 promoter with methanol. The recombinant protein was first purified by Hitrap SP cation exchange and then by Mono S HR column. In vitro cleavage assay showed that the recombinant protein has protease and helicase activity.