兰氏生物合成中的部分改性介质改变了兰氏合成酶的结构和动态
Yeganeh Habibi1, Nuwani W Weerasinghe1, Kevin A Uggowitzer1
1Department of Chemistry, McGill University, 801 Sherbrooke St. West, Montreal, Quebec H3A 0B8, Canada.
Journal of the American Chemical Society
|June 1, 2022
概括
第二类兰氏合成酶 (LanM酶) 修改前体来制造复杂的天然产品. 这项研究揭示了前体修饰如何系统地改变HalM2酶的结构和动态,确保高保真生物合成.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 自然产品的合成自然产品的合成
背景情况:
- 兰氏合成酶对于通过翻译后修改产生宏环天然产品至关重要.
- 第二类兰氏合成酶 (LanM酶) 具有基质灵活性,但具有很高的生物合成效率,这一机制仍然不太了解.
研究的目的:
- 研究一种成熟的前体兰氏 (HalA2) 的结构如何影响其相关的兰氏合成酶 (HalM2) 的结构和动态.
- 阐明 II 类 lanthipeptide 生物合成的高保真性背后的机制细节.
主要方法:
- 用本地乙烯宏循环合成HalA2的酶合成.
- 离子移动性质谱 (IM-MS) 用于分析HalM2的形状变化.
- -交换质谱 (HDX-MS) 用于研究当地的HalM2结构动态.
主要成果:
- 哈尔A2宏循环化系统地改变了哈尔M2酶的全球结构格局.
- 作为对HalA2的翻译后修饰的反应,HalM2的局部结构动态发生了变化.
- 在一个关键的HalM2α螺旋区域中的吸收取决于HalA2.2中的乙烯宏循环的数量.
- 在HalA2上不同的领导和核心结位协同影响HalM2.2中功能关键α螺旋结构的结构.
结论:
- 对HalA2的顺序后翻译修改改变了HalM2.2的结构动态.
- 在HalM2中的这些动态变化与酶的功能关键区域有关.
- 这些发现支持一种模型,在这种模型中,前体结构决定了高保真生物合成的酶动态.
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