摘要
[Objective] The research aimed to study the self-activation test of inverting T1083 substitution mutation BD fusion vector pGBKT7-TS into yeast,and discuss whether its expression product can be used as bait for further two-hybrid screening.[Method] T1083 substitution mutation BD fusion vector pGBKT7-TS was inverted into yeast to make the self-activation and protein expression toxic detection test.[Result] This expression product of the fragment was inactive and had no toxic to yeast cell.It could be used as bait for further two-hybrid screening.[Conclusion] The research laid the experimental foundation for further study of the effect of T1083 substitution mutation on the interaction of NtKrp and its target partner.
[目的]研究T1083替换融合质粒载体pGBKT7-Ts转入酵母的自激活实验,探讨其表达产物是否可作为诱饵进行酵母双杂交筛选。[方法]将T1083替换突变BD融合质粒载体pGBKT7-TS转入酵母后,进行自激活和蛋白表达毒性检测试验。pGBKT7-TS对报告基因自主激活的检测。将pGBKT7-TS质粒转染S.cerevisiae strainAH109和S.cerevisiaeY187菌株,同时分别转入pGBKT7作为对照,在SD-Trp平板上挑取转化菌落,悬于适量无菌水中,再分别接种于SD-Trp +X-α-gal、SD-Trp-His +X-α-gal、SD-Trp-Ade +X-α-gal和SD-Trp-Ade-His +X-α-gal平板。30℃培养2 ～3 d,观察各平板菌落颜色。确定含有pGBKT7-TS质粒的AH109和Y187酵母细胞内HIS、ADE、Mel1、LacZ报告基因的表达情况。pGBKT7-TS对酵母AH109和Y187的毒性检测、挑取大于2 mm的pGBKT7-TS转化的AH109克隆和pGBKT7-TS转化的Y187克隆各1个,分别接种于50 ml SD/-Trp+Kan(20μg/ml)培养基中,30℃、250 r/min培养16 h,检测OD600,若OD600<0.8,则DNA-BD可能有毒性;若OD600≥0.8,说明DNA-BD无毒性。[结果]转化pGBKT7-TS的酵母菌AH109在SD-Trp +X-α-gal平板和SD-Trp-His +X-α-gal平板上均可长出菌落,但在SD-Trp-Ade +X-α-gal平板和SD-Trp-Ade-His+X-α-gal平板上均无菌落生长,表明转入pGBKT7-TS后His报告基因有泄漏表达,但不能激活ADE和MELI报告基因。毒性检测试验中,重复2次,其OD600均大于0.8,说明DNA-BD融合蛋白对酵母AH109和Y187的生长无毒性,可以作为诱饵进行酵母双杂交筛选。[结论]为进一步研究NtKRP尾部T1083替换对NtKRP与靶物质结合的影响奠定了试验基础。
