通过胆固醇在酵母和动态核极化NMR中的标记来确定胆固醇与膜蛋白的结合
Matthew R Elkins1, Ivan V Sergeyev2, Mei Hong1
1Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States.
Journal of the American Chemical Society
|October 20, 2018
概括
这项研究引入了一种新的NMR光谱法,用于确定膜蛋白上的胆固醇结合点. 该技术成功地绘制了胆固醇与流感M2蛋白的相互作用,揭示了病毒芽的关键细节.
科学领域:
- 生物化学
- 结构生物学
- 生物物理
背景情况:
- 胆固醇在真核细胞膜蛋白的功能中起着至关重要的作用.
- 了解胆固醇与蛋白质的相互作用对于阐明膜蛋白功能和相关疾病至关重要.
- 很难确定膜蛋白中的胆固醇结合点.
研究的目的:
- 开发一种使用NMR光谱学识别真核细胞膜蛋白的胆固醇结合部位的总体策略.
- 为了证明这种策略对M2流感蛋白的适用性.
- 提供有关M2蛋白与胆固醇相互作用及其在膜裂变中的作用的原子层次见解.
主要方法:
- 使用酵母生物合成的13C丰富胆固醇.
- 在动态核极化 (DNP) 条件下使用二维相关性NMR光谱.
- 应用13C-13C双量子波器来简化光谱并检测蛋白质-胆固醇交叉峰值.
- 进行低温DNP以提高距离测量的灵敏度和固定性.
主要成果:
- 成功检测到流感M2蛋白转膜残留物和胆固醇群之间的13C-13C交叉峰值.
- 补充了M2蛋白与胆固醇同位素尾部接触的现有数据,以定义延长的结合接口.
- 提供了M2胆固醇相互作用的原子水平证据,在病毒芽过程中导致膜曲和分裂.
结论:
- 开发的NMR策略有效地确定本地类脂质膜中的胆固醇结合部位.
- 这些发现为M2流感蛋白如何与胆固醇相互作用以调解膜裂变提供了原子层面的见解.
- 这种方法广泛适用于研究胆固醇对其他真核细胞膜蛋白的影响.
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