GPC-3CTL表位表达载体构建

将重组的乙肝表面抗原(pcHBsAg)中多个CTL表位,用外源性的磷酸酰肌醇蛋白聚糖-3蛋白(GPC3)CTL表位序列替换,构建单拷贝和多拷贝DNA疫苗,获得不同位点的单拷贝或可同时表达多个CTL表位肽的真核表达质粒.以pcHBsAg质粒为模板,应用重叠延伸PCR扩增出含三个不同位点磷酸酰肌醇蛋白聚糖-3蛋白(GPC3)CTL表位EYILSLEEL(EYI)的HBsAg基因片段EYI1,及替换pcHBsAg中不同CTL表位的HBsAg基因片段EYI2、EYI3;分别将EYI1、EYI2、EYI3基因片段插入pBSSK+载体中,构建出含3拷贝EYI的pBSSK/EYI1、pBSSK/EYI2、pBSSK/EYI3载体.在此基础上,利用DNA重组技术将其分别定向插入真核表达载体pcDNA3.1+,构建表达EYI表位肽的DNA疫苗.真核表达载体经PCR、酶切和测序鉴定,结果显示:成功构建了pcDNA.EYI1/HBsAg、pcDNA-EYI2/HBsAg、pcDNA-EYI3/HBsAg真核表达质粒,为进一步测定以GPC3基因为基础的HBsAg多肽候选疫苗提供理论、实验依据.

Abstract：

Objective To construct the expression vectors of GPC-3 CTL epitope. Methods The HBsAg gene with three different EYILSLEEL (EYI) sites was named EYI1, and another with one EYI replacing CTL epitope FLG or SIL of pcHBsAg were named EYI2 and EYI3, respectively. All the three DNAs were amplified by SEOing PCR from pcHBsAg plasmid and linked into pBSSK+ vector to construct pBSSK/EYI1, pBSSK/EYI2, and pBSSK/EYI3. The three plasmid were identified by PCR, double digestion and sequencing, and the fragments with EYI1-3 were obtained by double digestion and then inserted into pcDNA3.1+ vector. Results and Conclusion PCR, enzyme digestion and sequence analysis confirmed successful construction of the eukaryotic expression vectors pcDNA-EYI1/HBsAg, pcDNA-EYI2/HBsAg, pcDNA-EYD/HBsAg, which facilitate further studies of the GPC3-HBsAg multiple peptides vaccine for HBV infection.

Construction of an expression vector of GPC-3 CTL epitope

Objective To construct the expression vectors of GPC-3 CTL epitope. Methods The HBsAg gene with three different EYILSLEEL (EYI) sites was named EYI1, and another with one EYI replacing CTL epitope FLG or SIL of pcHBsAg were named EYI2 and EYI3, respectively. All the three DNAs were amplified by SEOing PCR from pcHBsAg plasmid and linked into pBSSK+ vector to construct pBSSK/EYI1, pBSSK/EYI2, and pBSSK/EYI3. The three plasmid were identified by PCR, double digestion and sequencing, and the fragments with EYI...