克洛洛 (Chloroflexus aurantiacus Malonyl-CoA reductase) 的动态盖子域控制了反应的发生
Burak V Kabasakal1, Charles A R Cotton2, James W Murray3
1Department of Life Sciences, Imperial College, Exhibition Road, London, SW7 2AZ, UK; Turkish Accelerator and Radiation Laboratory, Gölbaşı, 06830, Ankara, Turkiye.
Biochimie
|November 12, 2023
概括
来自Chloroflexus aurantiacus的Malonyl-Coenzyme A降解酶 (MCR),对3基酸循环至关重要,在结构上具有重要特征. 晶体结构揭示了其双功能性质,并表明了涉及关键残留物的催化机制.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 酶学 是一种酶学.
背景情况:
- 马洛尼尔-协酶A降解酶 (MCR) 对于Chloroflexus aurantiacus.us的3-基酸 (3-HP) 循环至关重要.
- MCR通过一个酸半化中间体催化了malonyl-CoA的降解为3-HP.
- 该酶具有双功能,具有不同的N-终端和C-终端区域,负责连续的减少步骤.
研究的目的:
- 从C. aurantiacus. 来确定MCR的N端和C端区域的晶体结构.
- 通过结构和运动分析阐明MCR的催化机制.
- 为了确定关键的残留物和涉及MCR酶活性的域.
主要方法:
- 使用X射线结晶学,获得MCR的N端和C端区域的结构.
- 分析了连接体和基质结合结构,以提出一种催化机制.
- 进行了MCR变体的结构和运动研究.
主要成果:
- 确定了N端和C端MCR区域的晶体结构.
- 这两个区域都包含一个催化和一个非催化SDR域.
- 在C端的MCR中,有一个控制反应的盖域,其中保留的阿尔金宁和氨酸/氨酸在催化中起着至关重要的作用.
结论:
- 这项研究为C. aurantiacus的MCR提供了详细的结构洞察力.
- 对于C端的MCR,一个拟议的催化机制涉及NADPH的减少和半酸性分解.
- 保存的残留物Arg734,Arg773,Ser719和Tyr737被确定为MCR功能的关键.
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