需要用于3 - thiaglutamate生物合成的全酶TglHI的结构
Yanhui Zheng1, Xiaoqing Xu1, Xiaoli Fu1
1Division of Respiratory and Critical Care Medicine, State Key Laboratory of Biotherapy, West China Hospital of Sichuan University and Collaborative Innovation Center of Biotherapy, Chengdu 610041, China.
这项研究揭示了TglHI全酶的结构基础.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 自然产品生物合成 自然产品生物合成
背景情况:
- 核糖体合成和转化后修饰 (RiPPs) 是结构多样化的自然产物,具有多种生物活性.
- 一些RiPPs的组成部分3-thiaGlu (3-thiaGlu) 的生物合成涉及一个不寻常的反应步骤,该反应步骤在机制上尚不清楚.
- 具体来说,TglHI全酶在TglA-Cys中从氨酸中去除β-碳的过程尚不清楚.
研究的目的:
- 为了阐明TglHI全酶催化 β-碳去除在3 - thiaglutamate生物合成过程中的机制.
- 提供对这种非血二氧化物依赖酶的激活和催化机制的结构性见解.
主要方法:
- 有或没有铁的TglHI复合物的X射线晶体学.
- 生物化学测试以确定铁的要求和活性部位的组成.
主要成果:
- 三个TglHI复合体的晶体结构揭示了一个依赖于形状的激活机制.
- 催化口袋是由TglH-TglI相互作用形成的.
- 生物化学分析表明,活性中至少有两种铁离子,并确定了第三个铁位点.
结论:
- 这项研究为TglHI全酶的激活和催化提供了结构和生化洞察力.
- 这些发现揭示了3 - thiaglutamate生物合成中β-碳去除的机制.
- 突出了RiPP生物合成酶的DUF692家族内的进化和结构性保护.
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