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在抗菌素路径中对光盘多基基酸循环的编排
Kathrin Fritzsche1, Keishi Ishida, Christian Hertweck
1Leibniz Institute for Natural Product Research and Infection Biology, HKI, Department of Biomolecular Chemistry, Beutenbergstr. 11a, 07745 Jena, Germany.
Journal of the American Chemical Society
|June 7, 2008
概括
电阻菌素的生物合成涉及到一个独特的五环 discoid 结构,与典型的多基类不同. 它的形成需要聚基合成酶 (PKS) 和三种特定的循环酶的协调作用,这表明一种新的酶机制.
科学领域:
- 微生物学 微生物学
- 生物化学 生物化学
- 合成生物学 合成生物学
背景情况:
- 抗菌素是一种来自*Streptomyces resistomycificus*的细菌代谢产物,它具有独特的五环圆盘状环系统.
- 这种结构与通常在芳香型多基基中发现的线性或角度结构形成鲜明对比.
- 了解这种独特结构的生物合成对于探索新型自然产品和酶机制至关重要.
研究的目的:
- 识别和表征负责抵抗菌素生物合成的基因和酶.
- 为了阐明多基化合成中盘状环形成的机制.
- 为了研究抗菌素循环酶和那些参与线性/角性多基路径的功能差异.
主要方法:
- 系统的基因剖析和复制的II型多基酸合成酶 (PKS) 基因集群对抗菌素 (rem).
- 氨基酸序列-功能对抗菌素循环酶的相关性分析.
- 抵抗菌素和四菌素PKS成分之间的交叉补充实验.
- 突变分析和体内途径复制以确定涉及光盘循环化的循环酶.
- 突变菌株的代谢概况.
主要成果:
- 确定了所有足以进行抗菌素生物合成 (rem PKS) 的基因.
- 确定了三种循环酶 (RemI,RemF,RemL) 对于光盘循环过程至关重要.
- 交叉补充表明共享的早期生物合成步骤在抗菌素和四菌素路径之间.
- 发现了一种新型的四烯胺衍生物TcmR1.
- PKS和所有三种循环酶的协调作用是形成光盘环结构所必需的.
结论:
- 电阻菌素生物合成利用一组独特的酶,包括三个特定的循环酶,以实现五环圆盘状结构.
- 这些发现支持一种模型,其中多酶PKS复合体作为"子"来塑造多基化物,而不是单个酶的顺序循环.
- 这项研究提供了关于多基化生物合成途径和酶机制的演变和多样性的见解.
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