相关实验视频
Updated: Sep 15, 2025

Constructing Cyclic Peptides Using an On-Tether Sulfonium Center
Published on: September 28, 2022
在RiPP中依赖α-二氧化酶催化宏循环
Yinzheng Xia1, Ying Shi1, Zhixi Xiao1
1State Key Laboratory of Coordination Chemistry, Chemistry and Biomedicine Innovation Center of Nanjing University, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.
这项研究揭示了α-基酸盐依赖的二氧化酶 (αKGDs) 在核糖体合成和转化后修饰的 (RiPPs) 中催化宏循环. 一个由两个成分组成的JMJD系统在兰氏中形成独特的Cys-Tyr交叉链接.
科学领域:
- 生物化学
- 分子生物学
- 有机生物化学
背景情况:
- 已知的氧化生物催化剂是α-谷氨酸依赖的二氧化酶 (αKGD).
- 它们在核糖体合成和翻译后修饰的 (RiPP) 宏循环中的作用以前是未知的.
- 含有JmjC域的αKGDs (JMJDs) 经常与RiPP生物合成基因集群 (BGCs) 一起发现.
研究的目的:
- 研究αKGDs在RiPP宏循环中的作用.
- 描述参与RiPP生物合成的新型两组件JMJD系统.
- 阐明兰氏形成中的氧化交联机制.
主要方法:
- 对RiPP BGC进行生物信息分析以确定同时发生的JMJD.
- 来自Streptomyces corchorusii的BGC的异构复合.
- 生物化学测定和机制研究以确定酶功能和反应途径.
主要成果:
- 一组保存的II类兰氏BGC编码一个双组件的JMJD对.
- BGC产生结合金属的兰西,具有甲基环和Cys (S) -Tyr (Cβ) 交叉链.
- 这对CORB-CorD JMJD通过基介质催化氧化Cys{S}-Tyr{Cβ}交联,CORB作为催化CORD的重要合作伙伴.
结论:
- αKGDs,特别是JMJDs,是RiPP宏循环的新型激素催化剂.
- 一个独特的两组αKGD系统涉及一个活跃的JMJD和一个不活跃的同类物,扩展了已知的RiPP多样化的酶工具包.
- 这一发现加深了对天然产品生物合成中的酶策略的理解.
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