乙原蛋白类型抑制剂与线粒体复合体I的动态结合,通过光亲缘性标记揭示了这一现象
Misaki Nishida1, Cristina Pecorilla2, Takahiro Masuya1
1Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan.
Biochimica et biophysica acta. Bioenergetics
|July 1, 2025
概括
安诺纳氏种的乙原蛋白通过结合于其乌比金接入道中来抑制线粒体复合体I. 光亲和标记和模拟揭示了特定的结合点,完善了我们对复杂I抑制机制的理解.
科学领域:
- 生物化学 生物化学
- 线粒体呼吸 线粒体呼吸
- 酶抑制可以抑制酶.
背景情况:
- 来自Annonaceae植物的乙原蛋白是线粒体NADH-ubiquinone (UQ) 氧化还原酶 (复合物I) 的强有力的抑制剂.
- 它们独特的化学结构需要详细研究,以了解复杂的抑制机制.
- 以前的冷EM数据表明一种结合模式,但并不能完全解释结构-活性关系.
研究的目的:
- 为了阐明精确的结合机制和在复杂Iubiquinone-accessing道内的乙原蛋白的位置.
- 为了研究乙原蛋白衍生物的结构-活性关系.
- 完善对天然产品对复合I抑制的理解.
主要方法:
- 使用光反应性乙原因衍生物 (DLA-1) 对牛心脏SMP进行的光亲和标记实验.
- 蛋白质组学分析,以确定复合体I内的标记子单元和位点.
- 原子分子动力学模拟在ubiquinone-accessing道中的乙基因.
主要成果:
- DLA-1标记了复合体I的49-kDa和ND1子单元.
- 蛋白质组分析表明,在49kDa子单元道的内部区域有标记,但在ND1子单元道的内部没有标记.
- 分子动力学模拟显示DLA-1与多个道区域相互作用,与光亲和标记数据一致.
结论:
- 乙原蛋白结合涉及与复杂的Iubiquinone接入道的不同区域的相互作用,涉及49-kDa和ND1子单元.
- 结合模式比以前建议的更复杂,并解释了结构-活动关系.
- 这些发现为乙基因抑制复合体I提供了精细的分子基础.
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