Raf全长及氨基端、羧基端真核表达载体的构建和表达

背景与目的Raf是Ras-Raf-MEK-ERK信号转导通路中的关键分子,在多种人类肿瘤中存在高度活化,然而其生物学功能和详细调节机理目前尚未完全明了。本研究旨在构建人Raf基因全长(Raf-1),氨基端(N-Raf)及羧基端(C-Raf)真核表达载体,并观察其在293T细胞中的表达情况。方法通过PCR方法扩增Raf-1,N-Raf和C-Raf目的片段,利用基因重组技术构建pCMV-Tag2b-Raf-1,pCMV-Tag2b-N-Raf和pCMV-Tag2b-C-Raf真核表达载体,并进行酶切和测序鉴定。鉴定正确的克隆瞬时转染293T细胞,Western blot检测目的蛋白的表达。结果酶切和测序结果均证实pCMV-Tag2b-Raf-1,pCMV-Tag2b-N-Raf和pCMV-Tag2b-C-Raf真核表达载体的序列和编码框均正确无误,转染后的293T细胞经Western Blot检测可正确表达目的蛋白。结论本研究成功构建了pCMV-Tag2b-Raf-1,pCMV-Tag2b-N-Raf和pCMV-Tag2b-C-Raf真核表达载体并可在293T细胞中表达,为今后进一步研究Raf基因的生物学机理奠定了基础。

Construction and expression of eukaryotic expression vectors of full-length, amino-terminus and carboxyl-terminus Raf gene

Background and objective Raf is a key molecule in the Ras-Raf-MEK-ERK signal transduction pathway and is highly activated in different human carcinomas. However, its biological functions and regulation mechanisms are still unclear. The aims of this study were to construct eukaryotic expression vectors with Raf full encoding region, truncated amino-terminus and carboxyl-terminus, respectively. Methods Eukaryotic expression vectors of pCMV-Tag2b-Raf-1, pCMV-Tag2b-N-Raf and pCMV-Tag2b-C-Raf were constructed by gene recombination technique and confirmed by restriction enzyme analysis and DNA sequencing. Furthermore, the expression of these fusion proteins was detected by western blot in transient transfected 293T cells. Results The sequences and open reading frames of these three vectors were completely consistent with experimental design. All target proteins can be detected in 293T cells. Conclusion Eukaryotic expression vectors of pCMV-Tag2b-Raf-1, pCMV-Tag2b-N-Raf and pCMV-Tag2b-C- Raf were successfully constructed and can be expressed in 293T cells.