绿色荧光蛋白-小鼠纤维介素蛋白融合基因表达载体的构建和表达

Construction and characterization of GFP-mfgl 2 fusion protein expression plasmid

目的:构建绿色荧光蛋白(GFP)和小鼠纤维介素蛋白(mfgl2)的融合蛋白表达载体,在仓鼠卵巢(CHO)细胞中表达,为mfgl2的RNA干扰体外研究提供简便的判断手段。方法:用PCR从mfgl2cDNA文库中扩增出mfgl2cDNA片段,插入到GFP表达载体pEGFP N2中GFP基因序列的上游,构建成GFP mfgl2融合基因表达载体pEGFP mfgl2,将该载体转染到CHO细胞后24～48h,通过荧光显微镜观察并摄片。结果:扩增出长约1.3kb的基因片段,经双酶切鉴定和测序鉴定无误;重组载体转染CHO细胞后,在荧光显微镜下可观察到GFP的表达。结论:成功构建了pEGFP mfgl2融合基因表达载体;重组载体可在CHO细胞中表达出GFP mfgl2融合蛋白,为下一步进行mfgl2RNA干扰研究提供了简便的判断手段。

Objective: To construct and characterize GFP-mfgl 2 fusion protein expression plasmid (pEGFP-mfgl 2) and provide a direct and simplified methodology for primary assessment of the effect of mfgl 2 siRNA on the mfgl 2 gene expression. Methods: mfgl 2 cDNA was amplified from the mfgl 2 cDNA library pBluescript-m166 (pm166) of mouse genomic P1 plasmid and recloned into pEGFP-N2 upstream of GFP gene. The pEGFP-mfgl 2 was analyzed by restriction endonucleases BamH I and Hind III to ensure the orientation and the sequence. This fusion plasmid was then transfected into CHO cells and the fusion protein expression was observed by fluorescent microscope. Rusults: A 1.3 kb long cDNA was obtained. Restriction endonucleases and sequencing assays showed the correct orientation and sequence. After 24-48 hours transfection in CHO cells, the expression of pEGFP-mfgl 2 can be visualized through fluorescent microscope. Conclusion: pEGFP mfgl 2 has been constructed successfully. The recombinant vector can express GFP-mfgl 2 fusion protein. It provides a direct and simplified methodology for primary assessment of the effect of mfgl 2 siRNA on the mfgl 2 gene expression.