【摘要】 PCR扩增大肠杆菌参与脂肪酸合成的7个主要酶基因:fabD、fabG、fabH、fabA、fabZ、fabB和fabI,并构建相应的表达载体,在大肠杆菌BL21(DE3)中分别诱导表达酶蛋白,并使用Ni-NTA琼脂糖纯化到7种酶蛋白.体外添加所需酶蛋白和辅因子,在不使用[2-14C]丙二酸单酰CoA的条件下,成功地实现了脂肪酸合成反应的重建,另外还建立了数个鉴定有关酶蛋白功能的标准反应,并用其鉴定了丙酮丁醇梭菌FabZ的功能.更多还原

【Abstract】 Seven genes (fabD, fabG, fabH, fabA, fabZ, fabB and fabI) of E.coli fatty acid biosynthetic enzymes were cloned by PCR amplifying and appropriate expression vectors were constructed. Under induction assay expression of plasmid encoded proteins was carried out in strain BL21(DE3) and seven enzymes were purified using Ni-NTA agarose resin. In the absence of [2-14C] malonyl-CoA fatty acid synthetic reaction was reconstituted in vitro by adding seven enzymes and co-factors. And several model reactions were established for identification of special fatty acid biosynthetic enzymes. Meanwhile Clostridium acetobutylicium FabZ function was characterized by this method.更多还原