乙型肝炎病毒e抗原结合蛋白基因的筛选

目的筛选并克隆人肝细胞中与乙型肝炎病毒e抗原(HBeAg)相互作用的蛋白质基因。方法将重组诱饵质粒pGBKT7eAg转化酵母细胞AH109后与预转了人肝cDNA文库质粒的酵母细胞Y187进行配合,在营养缺陷型培养基上进行双重筛选阳性菌落,提取质粒后转化大肠埃希菌并进行序列测定,进行生物信息学分析。结果配合后筛选出既能在4缺(SD/TrpLeuAdeHis)培养基又能在铺有Xα半乳糖(Xαgal)的4缺培养基上生长并变成蓝色的真阳性菌落245株。完成了101株克隆的测定,经过序列分析排除了重复同源序列后,最终确定其中有41株不同的基因,其中人类同源基因35条,其余6株为未知基因。结论成功克隆出肝细胞中的HBeAg结合蛋白基因,为进一步研究HBeAg的功能提供了新线索。

Screening of the genes of hepatitis B virus e antigen interacting proteins

OBJECTIVE: To screen and clone the genes in hepatocytes which encode protein that can interact with hepatitis B e antigen(HBeAg) by yeast-two hybridization. METHODS: Recombined HBeAg bait plasmid (pGBKT7-eAg) was transformed into yeast AH l09, followed by mating with yeast Yl87 containing liver cDNA library plasmid in 2 x YPDA medium. Diploid yeast was plated on synthetic dropout nutrient medium (SD/-Trp-Leu-Ade-His) which contains X-a-gal for selecting positive blue clones. Then positive clones were selected and plasmids were prepared and sequenced. Finally, bioinformatics analysis was performed. RESULTS: Totally 245 positive colonies were selected and 101 colonies were sequenced. Through sequences alignment, 6 novel genes and 35 recorded genes were screened. CONCLUSION: Genes of HBeAg interacting proteins have been cloned successfully, which brings some new clues for further studies on the biological functions of HBeAg and the related proteins.