【摘要】 利用基因重组技术构建了高效表达非融合蛋白的大肠杆菌质粒载体pKPL系列。它们含有PL启动子、MS-2聚合酶SD顺序、起始密码、多克隆点及rrnB终止子顺序。利用pKPL-2D构建的PL-CAT-3质粒高效表达氯霉素转乙酰酶(Cat),表达量占菌体蛋白的30％以上。用pKPL质粒还表达出有生物活性的人白细胞介素-3和人粒单集落刺激因子。更多还原

【Abstract】 A new series of plasmid vectors pKPL was constructed by DNA recombinant techniques. Thesevectors express unfused proteins with high efficiency in E. coli. They contain the initiator ATG, themultiple cloning sites(MCS)and rrnB terminator. The plasmid pLCAT-3, which was derived from pKPL-2D, synthesizes chloramphnicol acetyltransferase (Cat) more than 30% of the total cellular protein.In addition, the pKPL series was successfully used for expressing human interleukin - 3 (IL-3) andGM-colony stimulator (GM-CSF) with biological activities.更多还原