l序列完全一致。氨基酸序列比对结果表明,136和164位的氨基酸也为赖氨酸和酪氨酸,与文献报道的活性中心位点一致。进而,将该基因通过EcoRI和BamHI两个酶切位点,严格控制起始密码子和启动子间距离的情况下克隆到高表达载体pYG5上,构建成新的质粒pLY2,并进行其表达研究。然后对粗酶的制备、转化条件的优化、分析检测方法的建立,以及产物的分离纯化等进行了研究, 初步获得了一条适合工业化生产N乙酰神经氨酸的路线。
图8 制备伏格列波糖4条不同工艺路线(略)
图9 三种不同的生物转化制备Neu5Ac的方法(略)
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