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重新设计一个基酶以优先化一个直接的化物前体
Weslee S Glenn1, Ezekiel Nims, Sarah E O'Connor
1Department of Biological Chemistry, The John Innes Centre, Norwich NR4 7UH, UK.
工程设计的黄素依赖素酶RebH (Y455W) 选择性地化胺,类化合物的前体. 这种工程酶能够在体内产生基化物,而不会在植物中积累不必要的副产品.
科学领域:
- 生物化学 生物化学
- 代谢工程是代谢工程.
- 自然产品的合成自然产品的合成
背景情况:
- 酶化为新型天然产品提供了一条途径,但酶基质的特异性限制了应用.
- 像RebH这样的氨酸依赖氨酸酶是关键的工具,但它们狭窄的基质范围限制了它们在复杂的代谢途径中的使用.
研究的目的:
- 为了设计依赖于黄素的原酶RebH,以提高对胺胺的基质特异性.
- 为了证明工程改造的RebH (Y455W) 突变物在Catharanthus roseus中产生化类化合物的体内疗效.
主要方法:
- 黄素依赖原酶RebH的局部定向突变,以产生Y455W突变.
- 用于代谢工程,将RebH Y455W突变物转化为Catharanthus roseus.
- 对工程植物组织中化物生产和副产品积累的分析.
主要成果:
- RebH Y455W突变者优先将安装到胺上,绕过了与野生类型 RebH.观察到的7 - 二甲积累相关的瓶.
- 工程设计的Catharanthus roseus培养物产生了12-chloro-19,20-dihydroakuammicine,一种化化物,在每克新鲜体重微克的水平上.
- 该RebH Y455W突变体表现出高选择性,防止7-三甲的积累.
结论:
- 设计的RebH Y455W提供了一种选择性方法,用于体内胺的化,这是类生物合成的关键中间体.
- 这种工程酶克服了野生类型化酶的局限性,使得特定的化天然产品的有效生产成为可能.
- 在RebH Y455W突变显示了代谢工程应用在产生新生物活性化合物的显著潜力.
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