人胰高血糖素样肽-1 cDNA的克隆与表达

目的：克隆人胰高血糖素样肽-1（hGLP-1)cDNA，构建原核表达质粒pGEX-4T-3/hGLP-1cDNA，并诱导表达谷胱甘肽疏基转移酶-hGLP-1(GST-hGLP-1)融合蛋白。方法：采用亚磷酸二酯法合成6个hGLP-1cDNA的寡核苷酸片段，拼接成完整的hGLP-1cDNA，克隆至pBSSK( /-)载体中，经双酶切鉴定和测序后把hGLP-1cDNA定向插入融合基因表达体pGEX-4T-3的多克隆位点上，构建重组质粒pGEX-4T-3/hGLP-1cDNA,并转化大肠杆菌TG1。结果：经限制性内切酶合蛋白GST-hGLP-1，为进一步获得大量可供实验研究和临床应用的重组hGLP-1创造条件。

Cloning and expression of human glucagon-like peptide-1 cDNA

Objective: To clone hGLP-1 cDNA in the pBS SK(+/-)vector and construct the expression vector of pGEX-4T-3/hGLP-1cDNA to express GST-hGLP-1 fusion protein. Methods: The hGLP-1 cDNA was constructed by 6 synthetic oligonucleotides fragments, followed by the procedure of annealing and ligation with oligonucleotides fragments. The hGLP-1 cDNA was cloned into the pBS SK(+/-) vector, and was selected by α-complementation. It was confirmed by DNA sequening, then inserted into the MCS of the fusion expression vector pGEX-4T-3. The recombinant vector was transformed into E. coli TG1. Results: The recombinant plasmid DNA was digested with restrictive endonuclease BamHⅠand XhoⅠ. The result demonstrated that the hGLP-1 cDNA was successfully inserted into the pGEX-4T-3 vector and fusion protein GST-hGLP-1 had been expressed in SDS-PAGE. Conclusion： Expression of GST-hGLP-1 fusion protein can provide foundation for obtaining a larger quantity of recombinant hGLP-1 for experimental and clinic studies.