VSV糖蛋白酵母双杂交诱饵载体的构建及其自激活作用的检测

Construction of a Bait Vector for VSV Glycoprotein and Evaluation of Its Self-activation in Yeast Two-hybrid System

构建水泡性口炎病毒糖蛋白(VSV-G)酵母双杂交诱饵载体,检测其在酵母细胞中的表达和自激活作用,为进一步研究酵母双杂交系统筛选与VSV-G相互作用蛋白奠定基础。通过RT-PCR方法从水泡性口炎病毒(VSV)克隆糖蛋白(G)基因,BamH I和Sal I双酶切后连接诱饵载体pSos,获得诱饵质粒pSos-VSV-G,经测序鉴定后pSos-VSV-G转化到酵母菌株cdcH25(α),在营养缺陷培养基中观察pSos-VSV-G的自激活作用和毒性作用,同时利用蛋白印迹法分析诱饵蛋白的表达。成功扩增VSV-G基因,并准确克隆入pSos中,诱饵载体pSos-VSV-G成功转化到酵母菌株cdcH25(α)中,经表型筛选检测无自激活作用和毒性作用,蛋白印迹法检测证实pSos-VSV-G在酵母细胞中表达诱饵蛋白。可以利用酵母双杂交系统筛选与VSV-G相互作的蛋白质。

It was to construct a bait vector for vesicular stomatitis virus glycoprotein（VSV-G）and detect its protein expression and self-activation activity in yeast cells, as a basis for further study of screening and VSV-G protein interaction in two hybrid system. Fragment of VSV-G gene were amplified using RT-PCR and directly ligated to pSos vector, insert-contained plasmid was confirmed by restriction endonuclease analysis and DNA sequencing. The self-activation and toxicity of the bait plasmid transformed into the yeast cells cdcH25（α）was observed in selective culture medium, and the bait protein was confirmed by Western blot. Results showed that VSV-G gene was found in the reconstructed plasmid pSos-VSV-G by sequencing. Yeast two-hybrid tests showed that yeast cells cdcH25（α）transfected with pSos showed that VSV-G had no self-activation and toxicity, the expression of bait protein was confirmed by Western blot. The yeast two-hybrid system can be applied to screen the interacting proteins of VSV-G.