人胰岛新生相关蛋白基因毕赤酵母表达载体的构建

目的 构建分泌表达具有生物学活性的重组人胰岛新生相关蛋白(rhINGAP)载体毕赤酵母.方法 通过PCR扩增INGAP基因,插入到重组质粒α/pUC18的α因子信号序列处,再将融合基因αINGAP重组到表达质粒pPIC9K,Sal Ⅰ酶切线性化重组质粒αINGAP/pPIC9K.电穿孔转化毕赤酵母,营养缺陷型培养基MD和G418筛选含高拷贝表达盒的酵母转化子,PCR鉴定是否含有目的 基因INGAP,甲醇诱导rhINGAP的表达,Western blotting鉴定目的 蛋白,ELISA法定量测定其含量.结果 重组表达质粒αINGAP/pPIC9K经酶切获得758bp片段,符合α因子与INGAP片段融合的长度,筛选得到3个阳性转化子,培养上清含有与抗INGAP抗体反应的蛋白.结论 成功构建了分泌INGAP蛋白的毕赤酵母菌株.

Cloning and expression of islet neogenesis associated protein in Pichia yeast

Objective To clone the human Islet neogenesis associated protein(rhINGAP)gene,express the gene extraeellulary in Pichia yeast for.further study on biological function and animal test on INGAP.Methods INGAP gene Was amplified with PCR and inserted into the recombinant plasmidα/pUC18.Then,the fusion gene of α and INGAP was digested and inserted into the expression plasmid pPIC9K.The positive recombinant plasmid which integrated INGAP Was confirmed by restriction enzyme digestion and sequencing,and it Was linearized with Sal Ⅰ digestion and transfered into the yeast host strain GS115 through electroporation.The yeast transformants that harbor the desired gene INGAP with high copy were selected by the auxotroph mediam G418,and verified by PCR.The condition of hake-flask culture was optimized,and the recombinant human INGAP Was induced expression with methanol as the only Carbone source.The antigen activity of the desired protein Was detected by Western blotting and ELISA method.Results Recombinant plasmid αINGAP/pPIC9K were successfully constructed and three positive Pichia yeast transformants were obtained.The expressed protein had satisfactory antigen activity,which Was confirmed by the Western blotting and ELISA method.Conclusions Pichia yeast expressing human Islet neogenesis associated protein (rhINGAP)gene was successfully constructed.