目的:研究增强型绿色荧光蛋白(Enhanced Green Fluorescent Protein,EGFP)基因在大肠杆菌中的基因克隆、重组表达及纯化。方法:采用PCR方法克隆EGFP全长cDNA序列,构建原核表达载体pGEX4T-1-EGFP,经过DNA序列测定证实其序列正确,转化大肠杆菌BL21(DE3)pLysS,通过异丙基硫代-β-D-半乳糖苷(isopropyl—beta—D—thiogalactopyranoside,IPTG)诱导表达,用谷胱甘肽-Sepharose 4B层析法纯化GST—EGFP融合蛋白。结果:成功地克隆了EGFP全长cDNA序列,并进行原核表达以及蛋白的纯化,GST—EGFP的表达量占菌体蛋白量的40%以上。经纯化后纯度高于90%。菌体超声裂解后上清波及其纯化产物在长波紫外线的照射下,发出明亮的绿色荧光。结论:本研究为应用EGFP追踪细胞吞噬功能等动态活动奠定了实验基础。
Objective: To study the gene clone, expression and purification of EGFP (Enhanced Green Fluorescent Protein) gene in E. coli. Methods: EGFP genes were cloned to build prokaryotic expression plasmid pGEX - EGFP. EGFP - GSTwere purified with GSTrap FF columns. Results: The EGFP - GST molecular weight is around 53 000D. The EGFP - GST solution after purification show bright kelly. Conclusion: In this study, the experimental foundation for the usage of EGFP in cell actions has been established.