包膜蛋白突变对乙型肝炎病毒包装的影响

The effect of envelope protein mutation on hepatitis B virus assemble

目的 探讨包膜蛋白突变对HBV包装的影响。方法 构建包膜蛋白突变的全长HBV基因组表达载体:前S1突变HBV表达载体pHBV mS1、Sloop突变HBV表达载体pHBV mS和前S1、S共突变HBV表达载体pHBV mS1S。分别转染HepG2细胞,以野生型HBV质粒 (adwR9 )转染HepG2细胞为对照;pHBV mS1S和pcDNA3分别与adwR9共转染HepG2细胞。ELISA方法检测上清液中和胞内S抗原;荧光定量PCR检测胞内和上清液中病毒量。结果 突变体pHBV mS1、pHBV mS和pHBV mS1S与对照组adwR9中S蛋白表达量和分泌量无明显差别;单独转染的突变体胞内病毒量较adwR9高,尤其以pHBV mS1S明显,而突变体上清中病毒量较对照组adwR9低,尤其以pHBV mS1S明显;pHBV mS1S与adwR9共转染组上清液中病毒量较pcDNA3与adwR9共转染组低。结论包膜蛋白突变对S蛋白表达量和分泌量无影响,但影响病毒包装,使病毒分泌量下降。

Objective To investigate the effect of envelope protein mutation on HBV assembly. Methods The envelope protein mutated vectors were constructed by the molecular clone in vitro, and then transfected transiently in the cell HepG2. The expression and secretion of S protein was assay by ELISA. HBV DNA was quantitatively evaluated by PCR. After co-transfection with pHBV-mS1S and adwR9 the DNA was quantitatively evaluated by PCR. Results There was no significant difference in expression and secretion of S protein assayed by ELISA in the cytoplasm and supernatant among pHBV-mS1, pHBV-mS, pHBV-mS1S and the wild HBV adwR9 plasmid. The DNA detected by real-time fluorescence quantitative PCR from those the cytoplasm of mutants was higher than that from the wild HBV adwR9 cytoplasm, especially from the cytoplasm of pHBV-mS1S plasmid. However, the DNA detected by real-time fluorescence quantitative PCR from the supernatant of those mutants was lower than that from the wild HBV adwR9 supernatant, especially from pHBV-mS1S. The DNA detected by real-time fluorescence quantitative PCR from the supernatant co-transfected with pHBV-mS1S and adwR9 was lower than that from the supernatant co-transfected with pcDNA3 and adwR9. Conclusion There was no effect of envelope protein mutation on the expression and secretion of S protein. Envelope protein mutation could interfere the assembly of HBV particle and cause reduction of secretion of HBV.