苏尔M的产生单巴克坦的铁酶域的结构与上游载体蛋白质域形成了一个独特的复合体
Ketan D Patel1, Ryan A Oliver2, Michael S Lichstrahl2
1Department of Structural Biology, University at Buffalo, SUNY, Buffalo, New York, USA.
The Journal of biological chemistry
|June 22, 2024
概括
非核糖体合成酶 (NRPSs) 产生生物活性. 研究人员结构性地分析了一个关键的铁酶域,揭示了对不寻常的β-乳酸形成的洞察力,并使得新的抗生素基因集群的发现成为可能.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 生物信息学是一种生物信息学.
背景情况:
- 非核糖体合成酶 (NRPSs) 是大型酶复合体,通过装配线机制合成各种生物活性.
- 虽然大多数NRPS域执行标准键形成,但有些表现出独特的催化活动.
- 单种抗生素sulfazecin是由SulM thioesterase域产生的,它催化了一种不寻常的β-乳酸环形成.
研究的目的:
- 确定硫酶生物合成中涉及的铁酶域的结构.
- 阐明由铁酶域催化β-乳酸形成的机制.
- 通过生物信息学分析识别新的β-乳酸产生基因集群.
主要方法:
- 采用X射线晶体学,确定了 thioesterase 域的结构,既单独,又与类载体域复合.
- 用分子建模来模拟基质结合,并确定活性部位内的关键相互作用.
- 基因组挖掘是为了寻找编码类似的硫酶域的非特征化生物合成基因集群而进行的.
主要成果:
- 晶体结构揭示了一个受约束的活性点口袋,这可能是指导β-乳酸形成基质的关键.
- 建模表明基质和活性部位残留物 (Arg2849和Asn2819) 之间的特定相互作用.
- 确定的结构与β-乳酸形成的硫酶域有相似之处,表明循环化反应的结构特征得到保护.
结论:
- 结构和建模数据提供了对SulM thioesterase域不寻常的β-乳酸形成的机制理解.
- 这些发现有助于识别新的生产β-乳酸的生物合成基因集群,扩大已知的NRPS衍生的天然产品目录.
- 这项工作突出了通过研究NRPS酶机制来发现新型抗生素和其他有价值化合物的潜力.
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