限制结合热点:NMR和分子动力学模拟为SH2-联体结合中的力-力补偿提供了结构性的解释
Joshua M Ward1, Nina M Gorenstein, Jianhua Tian
1Department of Medicinal Chemistry, Markey Center for Structural Biology, and Purdue Cancer Center, Purdue University, West Lafayette, Indiana 47907, USA.
Journal of the American Chemical Society
|August 12, 2010
概括
蛋白质 - 配体结合中的合-合补偿可以通过微妙的结构变化来解释. 在配体中预先组织氨酸 (pY) 残留物可能会导致低于最佳的相互作用,这表明了改善结合的替代约束策略.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 化学物理 化学物理
背景情况:
- 度-度补偿是分子识别中常见的热力学现象.
- Src SH2 域结合含有胺的,其相互作用对细胞信号传递至关重要.
- 了解这种补偿的结构基础是设计高亲缘关系联体的关键.
研究的目的:
- 调查胺-Src SH2域相互作用中能-能补偿的结构基础.
- 为了将微妙的结构性扰动与观察到的热力学变化相关联.
- 评估连接体预组织在结合热力学中的作用.
主要方法:
- 核磁共振 (NMR) 光谱学,包括 (15) N-放松研究.
- 分子动力学 (MD) 模拟.
- 分析晶体结构和热量计数据.
主要成果:
- 连接体预组织,在获得结合的同时,导致结合的平衡损失.
- 核磁共振化学转移差异表明结合界面的微妙结构性扰动,特别是在热点残留物中.
- 蛋白质骨干动力学和整体结构相似性在不同连接体复合体中基本上不受影响.
结论:
- 度-度补偿不是固有的属性,而是来自结合相互作用中的微妙结构变化.
- 甲酸残留物在配体中的预组织可以导致低于最佳的相互作用和度-度补偿.
- 核磁共振化学转移是用于检测具有能量意义的结构性扰动的敏感探头.
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