亚域动态使非核糖体合成酶中的化学连锁反应成为可能
Xun Sun1,2, Jonas Alfermann3, Hao Li1
1Department of Chemistry, Princeton University, Princeton, NJ, USA.
Nature chemistry
|December 4, 2023
概括
非核糖体合成酶 (NRPS) 使用动态基化域 (A域) 来构建复杂的. 这些A域在构造之间切换,使得在生物合成过程中能够连续添加氨基酸.
科学领域:
- 生物化学 生化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 非核糖体合成酶 (NRPS) 是大型分子机器,负责合成许多衍生物的天然产品.
- NRPSs通过一个装配线机制起作用,顺序结合氨基酸.
- 在NRPS中的腺化域 (A域) 激活氨基酸并将其转移到基载体蛋白 (PCP).
研究的目的:
- 阐明其催化循环期间在格拉米西丁S合成酶I的A域内的动态构造变化.
- 了解这些结构动态如何促进NRPSs的顺序生物化学反应.
- 揭示A域调节基质选择和转移的机制.
主要方法:
- 单分子Förster共振能量转移 (smFRET) 用于实时监测形状变化.
- 生物化学测试以评估酶活性和基质相互作用.
- 计算建模用于预测和分析结构状态.
- 小角度X射线散射 (SAXS) 来确定总体域结构.
主要成果:
- 格拉米西丁S合成酶I的A域循环通过至少三种不同的构造:基化,硫形成和扩展状态.
- 这些形状变化是内在的,层次的,并且与腺和氨基酸转移的酶步骤紧密结合.
- 甲域与基载体蛋白 (PCP) 之间的相互作用由这些构造性转移调节,影响基质通道.
结论:
- 格拉米西丁S合成酶IA域采用大幅度的结构动态,以确保定向和高效的生物合成.
- 了解这些动态机制为更广泛的NRPS功能和天然产品合成领域提供了洞察力.
- 这项研究揭示了酶结构和动态如何与复杂的生物化学过程相结合的基本原理.
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