目的:以psiCHECK-2质粒为骨架,构建带有远红外荧光蛋白mLumin和增强型绿色荧光蛋白(enhanced green fluorescent protein,eGFP)的双荧光蛋白报告基因质粒psiCHECK-2-eGFP-mLumin。方法:PCR扩增mLumin和eGFP基因片段,分别取代海肾荧光素...目的:以psiCHECK-2质粒为骨架,构建带有远红外荧光蛋白mLumin和增强型绿色荧光蛋白(enhanced green fluorescent protein,eGFP)的双荧光蛋白报告基因质粒psiCHECK-2-eGFP-mLumin。方法:PCR扩增mLumin和eGFP基因片段,分别取代海肾荧光素酶和萤火虫荧光素酶插入psiCHECK-2质粒中,构建psiCHECK-2-eGFP-mLumin双荧光蛋白报告基因重组质粒mLumin。通过测序验证插入序列,并将此质粒转入HEK293T细胞,分别用PCR和荧光显微镜鉴定eGFP和mLumin在细胞中的表达。结果:DNA测序结果证实连接在psiCHECK-2质粒上的eGFP和mLumin基因序列与基因库中的序列一致。将psiCHECK-2-eGFP-mLumin质粒转染HEK293T细胞,能成功表达eGFP和mLumin蛋白。结论:成功构建psiCHECK-2-eGFP-mLumin双荧光蛋白报告基因质粒,且可在真核细胞中表达。展开更多
MicroRNAs(miRNAs)are regulatory RNA molecules that bind to target messenger RNAs(mRNAs)and affect the stability or translational efficiency of the bound mRNAs.Single or dual-luciferase reporter systems have been succe...MicroRNAs(miRNAs)are regulatory RNA molecules that bind to target messenger RNAs(mRNAs)and affect the stability or translational efficiency of the bound mRNAs.Single or dual-luciferase reporter systems have been successfully used to identify miRNA target genes in mammalian cells.These reporter systems,however,are not sensitive enough to verify miRNA-target gene relationships in insect cell lines because the promoters of the target luciferase(usually Renilla)used in these reporter systems are too weak to drive sufficient expression of the target luciferase in insect cells.In this study,we replaced the SV40 promoter in the psiCHECK-2 reporter vector,which is widely used with mammalian cell lines,with the HSV-TK or AC5.1 promoter to yield two new dual-luciferase reporter vectors,designated psiCHECK-2-TK and psiCHECK-2-AC5.1,respectively.Only psiCHECK-2 and psiCHECK-2-AC5.1 had suitable target(7?enz7/a)/reference(firefly)luciferase activity ratios in mammalian(HeLa and HEK293)and insect(Sf9,S2,Helicoverpa zea fat body and ovary)cell lines,while psiCHECK-2-TK had suitable Renilla/firefly luciferase activity ratios regardless of the cell line.Moreover,psiCHECK-2-TK successfully detected the interaction between Helicoverpa armigera miRNA9a and its target,the 3'-untranslated region of heat shock protein 90,in both mammalian and H.zea cell lines,but psiCHECK-2 failed to do so in IT.zea cell lines.Furthermore,psiCHECK-2-TK with the target sequence,HzMasc(H.zea Masculinizer),accurately differentiated between H.zea cell lines with or without the negative regulation factor(miRNA or piRNA)of HzMasc.These data demonstrate that psiCHECK-2-TK can be used to functionally characterize small RNA target genes in both mammalian and insect cells.展开更多
文摘目的:以psiCHECK-2质粒为骨架,构建带有远红外荧光蛋白mLumin和增强型绿色荧光蛋白(enhanced green fluorescent protein,eGFP)的双荧光蛋白报告基因质粒psiCHECK-2-eGFP-mLumin。方法:PCR扩增mLumin和eGFP基因片段,分别取代海肾荧光素酶和萤火虫荧光素酶插入psiCHECK-2质粒中,构建psiCHECK-2-eGFP-mLumin双荧光蛋白报告基因重组质粒mLumin。通过测序验证插入序列,并将此质粒转入HEK293T细胞,分别用PCR和荧光显微镜鉴定eGFP和mLumin在细胞中的表达。结果:DNA测序结果证实连接在psiCHECK-2质粒上的eGFP和mLumin基因序列与基因库中的序列一致。将psiCHECK-2-eGFP-mLumin质粒转染HEK293T细胞,能成功表达eGFP和mLumin蛋白。结论:成功构建psiCHECK-2-eGFP-mLumin双荧光蛋白报告基因质粒,且可在真核细胞中表达。
基金This work was supported by the National Science Foundation of China(NSFC)-Henan Joint major grant(U2004206)the State Key Laboratory of Cotton Biology(CB2020A06).
文摘MicroRNAs(miRNAs)are regulatory RNA molecules that bind to target messenger RNAs(mRNAs)and affect the stability or translational efficiency of the bound mRNAs.Single or dual-luciferase reporter systems have been successfully used to identify miRNA target genes in mammalian cells.These reporter systems,however,are not sensitive enough to verify miRNA-target gene relationships in insect cell lines because the promoters of the target luciferase(usually Renilla)used in these reporter systems are too weak to drive sufficient expression of the target luciferase in insect cells.In this study,we replaced the SV40 promoter in the psiCHECK-2 reporter vector,which is widely used with mammalian cell lines,with the HSV-TK or AC5.1 promoter to yield two new dual-luciferase reporter vectors,designated psiCHECK-2-TK and psiCHECK-2-AC5.1,respectively.Only psiCHECK-2 and psiCHECK-2-AC5.1 had suitable target(7?enz7/a)/reference(firefly)luciferase activity ratios in mammalian(HeLa and HEK293)and insect(Sf9,S2,Helicoverpa zea fat body and ovary)cell lines,while psiCHECK-2-TK had suitable Renilla/firefly luciferase activity ratios regardless of the cell line.Moreover,psiCHECK-2-TK successfully detected the interaction between Helicoverpa armigera miRNA9a and its target,the 3'-untranslated region of heat shock protein 90,in both mammalian and H.zea cell lines,but psiCHECK-2 failed to do so in IT.zea cell lines.Furthermore,psiCHECK-2-TK with the target sequence,HzMasc(H.zea Masculinizer),accurately differentiated between H.zea cell lines with or without the negative regulation factor(miRNA or piRNA)of HzMasc.These data demonstrate that psiCHECK-2-TK can be used to functionally characterize small RNA target genes in both mammalian and insect cells.
