猪囊尾蚴疫苗候选基因TSO18在酵母中的高效表达

将猪带绦虫六钩蚴TSO18基因亚克隆至毕赤酵母分泌性表达载体pPIC9K,构建重组表达载体pPIC9K_TSO18，电转化毕赤酵母菌GS115,使重组表达载体与酵母染色体发生同源整合。采用G418抗性梯度法筛选得到多拷贝重组菌株，用甲醇进行诱导表达，并对表达产物进行SDS_PAGE和Western blot分析、脱糖基化分析、分子筛纯化和小鼠免疫接种等表明，目的蛋白得到了高效表达并进行了适度的糖基化，易于纯化且具有免疫活性。在5L发酵罐中目的蛋白表达量达到2.54mg/mL，为制备基因工程疫苗打下了坚实的基础。

High-level Expression of the Potential Vaccine Antigen TSO18 of Taenia solium in Pichia pastoris

TSO18 gene was subcloned into the Pichia pastoris expression vector pPIC9K. The recombinant plasmid pPIC9K-TSO18 was transformed into P. pastoris GS115 by electroporation so that the plasmid will be integrated with chromosome of P. pastoris. The P. pastoris strains containing multi-copy recombinant were screened by G418 and induced by methanol. The expression product was analyzed by SDS-PAGE, Western blot, deglycosylation, and purified by Sephadex column, and was used to immunize mice. The results indicated that the target protein was efficiently expressed in P. pastoris, and glycosylated moderately, and had immunological activity. In a 5 liter fermentor, the expression level of the target protein was up to 2.54 mg/mL. These results will benefit for the development of genetically engineering vaccine.