克隆并构建人骨形成蛋白2真核表达载体

目的探讨构建人骨形成蛋白2(human bone morphgenetic protein 2,hBMP 2)真核表达载体的方法.方法由人成骨肉瘤细胞中提取细胞总RNA,利用RT PCR方法扩增获得hBMP-2基因cDNA,将基因片断重组到pGEM-T质粒中构建pGEM T hBMP-2重组质粒载体,转化到大肠杆菌DH5α后筛选阳性克隆,利用限制性酶切和DNA序列分析鉴定重组质粒.分别用EcoR Ⅰ和Not Ⅰ双酶切pGEM-T-hBMP-2质粒和pcDNA3.1( )真核表达载体,将克隆载体中hBMP基因重组到pcDNA3.1( )真核表达载体,提取质粒作酶切电泳、PCR鉴定及DNA测序.结果人骨肉瘤细胞中经RT-PCR得到1.2kbp的hBMP 2扩增条带,重组质粒pGEM T-hBMP 2经酶切电泳可见1.2 kbp的hBMP 2条带和4.0 kbp的载体片断;pcDNA3.1 hBMP-2质粒经酶切电泳可见1.2 kbp的hBMP-2条带和5.0kbp的载体片断,重组质粒酶谱分析与预期一致;DNA序列分析测序结果校对后经BLAST分析,表明核酸序列与Gene Bank中和hBMP-2的mRNA序列完全吻合.结论通过此方法能成功克隆获得hBMP-2基因,并构建其真核表达载体.

CLONING AND CONSTRUCTING OF BONE MORPHOGENETIC PROTEIN 2 EUKARYOTIC EXPERSSION VECTOR

Objective To clone human bone morphogenetic protein 2 (BMP-2) gene and construct the gene's eukaryotic expression vector. Methods The total RNA was extracted from human osteosarcoma cells, the human BMP-2 cDNA was amplified by RT-PCR and inserted into pGEM-T vector. The positive clones were screened out, and then the recombinant plasmid was confirmed by restriction enzyme digestion, PCR and the analysis of nucleotide sequence. The BMP-2 cDNA in the pGEM-T cloning vector was inserted into the pcDNA3.1(+) eukaryotic expression vector. Results The agarose electrophoresis showed that the fragments of BMP-2, pGEM-T and pcDNA3.1(+) were 1.2 kbp, 4.0 kbp and 5.0 kbp, respectively. The result of nucleotide sequence confirmed that the cDNA sequence, which was inserted into pGEM-T and pcDNA3.1(+) plasmid was human BMP-2. Conclusion The pcDNA3.1(+)-hBMP-2 eukaryotic vector can be successfully constructed.