摘要将克隆自拟南芥的4cl基因和巨峰葡萄的m基因,利用降落重叠延伸PCR的方法,成功构建了含有C,418抗性筛选标记的酵母表达载体pRS42K-4CL以及含有潮霉素抗性筛选标记的酵母表达载体pRS42H-RS。采用LiAc/SScarrierDNA/PEG法将含有目的基因的2个载体共同转化至酿酒酵母工业菌株EClll8中,通过PCR及酶切鉴定等方法验证重组工程茵。以对香豆酸为底物,将获得的酿酒酵母工程菌于YPD液体培养基中发酵(25℃,150r/min,96h),发酵液用乙酸乙酯抽提后采用高效液相色谱(HPLC)法进行检测,其结果显示发酵产物中自藜芦醇的含量为0.78mg/L。这表明,拟南芥的4cl基因与巨峰葡萄的rs基因在酿酒酵母工程菌中成功得到了表达,并且表达产物利用对香豆酸为前体物质合成了目标产物白藜芦醇。该研究为进一步实现白藜芦醇在酵母中的工业化生产奠定了基础。
The 4-coumarate: coenzyme A ligase gene (4CL) from Arabidopsis thaliana and resveratrol synthase gene (RS) from Vitis vinifera were cloned into the 2~-based muhicopy drug resistance marker plasmids pRS42K ( G418 resistance) and pRS42H ( hygromycin resistance). The recombinant plasmids were transformed into EC1118 cells using the LiAc/SS carrier DNA/PEG method. A shaking flask fermentation (25 ℃ , 150 r/rain) of the engi- neered strain in YPD medium supplemented with 0. 1 mmol/L p-coumarate every 24 h was performed. Under these conditions, this strain produced 0.78 mg/L resveratrol within 96 h. The result showed that the A. thaliana 4CL gene and V. vinifera RS gene were expressed in this recombinant strain to produce resveratrol from p-coumarate successful- ly.