乙型肝炎病毒DNA聚合酶反式调节人类新基因HBVDNAPTP1的克隆及原核表达与组织表达分析

Cloning, prokaryotic expression and tissue expression profile of human novel gene HBVDNAPTP1 transactivated by hepatitis B virus DNA polymerase

目的克隆应用抑制性消减杂交(SSH)技术及生物信息学技术筛选得到的乙型肝炎病毒(HBV)DNA聚合酶反式调节新型靶基因HBVDNAPTP1,构建HBVDNAPTP1基因的原核表达载体,诱导其在大肠埃希菌中表达,并进一步分析HBVDNAPTP1在组织中的分布表达水平。方法应用RT-PCR技术扩增获得HBVDNAPTP1基因片段,测序正确后插入至原核表达载体pET-32a(+)中,转化BL21(DE3)宿主菌,IPTG诱导以获得HBVDNAPTP1融合蛋白的表达,利用Westernblot证实表达蛋白的特异性。应用UniGene数据库对HBVDNAPTP1基因的染色体中定位及组织分布表达水平进行分析。结果RT-PCR扩增获得HBVD-NAPTP1基因片段,插入pET-32a(+)表达载体,转化BL21(DE3)受体菌,经IPTG诱导获得了HBVDNAPTP1重组蛋白的表达,Westernblot证实了表达的重组蛋白的特异性。HBVDNAPTP1在多数组织中低表达,仅在脑垂体腺、扁桃体、舌、胸腺、气管与脐带中无表达。结论成功构建了HBVDNAPTP1基因的原核表达载体,利用大肠埃希菌原核表达系统获得了重组蛋白的表达,并初步了解了HBVDNAPTP1基因的染色体定位与组织表达水平。

Objective To clone the human target gene HBVDNAPTP1 transactivated by hepatitis B virus DNA polymerase obtained by screening with suppression subtractive hybridization （SSH） and bioinformatics techniques. To construct prokaryotic expressive vector of HBVDNAPTP1 gene, induce the expression of recombinant protein in E. coli, and analyze the expression level of HBVDNAPTP1 gene in human tissues. Methods The DNA fragment of HBVDNAPTP1 was amplified by reverse transcription polymerase chain reaction （RT- PCR） taking mRNA from HepG2 cells as the template, and the correct DNA fragment was then inserted into inducible prokaryotic expressive vector pET-32a （＋）. The competent EL21 （DE3） E. coli was transformed, and then cultured and induced with IPTG. The expressed HBVDNAPTP1 was confirmed with Western blot. UniGene database was used to analyze the chromosome mapping and tissue expression profile of HBVDNAPTP1 gene. Remits The DNA fragment of HBVDNAPTP1 was amplified by RT-PCR. HBVDNAPTP1 expressive vector was constructed. After transformation with pET-32a（＋）-HBVDNAPTP1 and induction with IPTG, recombinant HBVDNAPTP1 was expressed and confirmed by Western blot. The expression of genomic location of HBVDNAPTP1 gene was low in multiple-tissues with the exception of pituitary gland, tonsil, tongue, thymus, trachea and umbilical cord. Conclusion The recombinant HBVDNAPTP1 gene could be expressed in prokaryotic expression system of E. coli. The chromosome mapping and tissue expression level of HBVDNAPTP1 gene is tentatively conceived.