膜脂质组成影响FoF1-ATP合成酶中质子半通道的水合
Leonid A Ivontsin1, Elena V Mashkovtseva1, Yaroslav R Nartsissov1,2
1Institute of Cytochemistry and Molecular Pharmacology, 24/14 6th Radialnaya Str., Moscow 115404, Russia.
Life (Basel, Switzerland)
|September 28, 2023
概括
膜心脂蛋白 (CL) 含量影响FoF1-ATP合成酶质子半通道. 更高的CL水平增加了水的透,增强了质子运输的连续性,并揭示了关键的氨基酸相互作用.
科学领域:
- 结构生物学 结构生物学
- 生物化学 生物化学
- 计算生物物理学的计算生物物理学
背景情况:
- 膜脂质组成极大地调节了膜蛋白活性.
- FoF1-ATP合成酶利用质子梯度进行ATP合成,涉及质子半通道.
- 心脂蛋白 (CL) 是一种关键的膜脂质,特别是在细菌应激条件下.
研究的目的:
- 调查膜脂质组成,特别是心脂素 (CL) 含量对FoF1-ATP合成酶中质子半通道的结构和动态的影响.
- 阐明水分子和氨基酸相互作用在质子运输通路中的作用.
- 在不同的膜条件下开发ATP合成酶中质子运动的模型.
主要方法:
- 细菌FoF1-ATP合成酶复合物的分子动力学模拟 (PDB ID: 6VWK).
- 在三个不同的膜环境中进行了模拟:POPC,25%CL (体内) 和75%CL (细菌应激).
- 分析蛋白质结构稳定性,水分子分布和氨基酸残留的动态.
主要成果:
- 在所有测试的脂质组成中,FoF1-ATP合成酶结构保持稳定.
- 增加的心脂蛋白 (CL) 含量导致质子半通道的水分增加,水腔合并并形成连续的水链.
- 更深的水透和轻微的构造变化增强了质子运输连续性,特定的氨基酸相互作用 (例如aAsn214) 保持稳定.
结论:
- 膜性心脂蛋白 (CL) 含量显著影响FoF1-ATP合成酶半通道的水合和质子运输效率.
- 提出了质子运动模型,强调了水连续性的重要性以及特定的氨基酸-水/氨基酸-氨基酸相互作用.
- 这项研究强调了膜组成在理解ATP合成酶的功能动态方面的关键作用.
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