CH-π 相互作用赋予蛋白质-碳水化合物结合点的方向灵活性
Allison M Keys1, David W Kastner2, Laura L Kiessling3
1Computational and Systems Biology Program, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA; Department of Chemical Engineering, MIT, Cambridge, Massachusetts, USA; Department of Chemistry, MIT, Cambridge, Massachusetts, USA.
The Journal of biological chemistry
|June 16, 2025
概括
蛋白质与碳水化合物的相互作用对于生物过程至关重要. 这项研究揭示了键如何影响CH-π堆叠方向,影响蛋白质内的甘氨酸识别和运动.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 计算生物学 计算生物学
背景情况:
- 蛋白质与碳水化合物的结合对于细胞功能至关重要,如识别和免疫信号传递.
- 水友性甘氨酸对选择性蛋白质识别具有挑战,因为它具有有限的疏水表面.
- CH-π堆叠相互作用在蛋白质-碳水化合物结合部位中普遍存在,是识别的关键驱动因素.
研究的目的:
- 研究蛋白质环境如何影响CH-π堆叠相互作用的方向.
- 为了澄清CH-π堆叠相互作用和蛋白质-碳水化合物结合中的键之间的功能相互作用.
- 了解这些相互作用如何影响甘氨酸连接体的识别和动态.
主要方法:
- 利用了经过良好化的元动力学模拟.
- 获得了蛋白质-β-D-银化物复合体的有约束力的自由能量场景.
- 分析了键网络对CH-π堆叠方向的影响.
主要成果:
- 喜欢的CH-π堆叠方向是由蛋白质结合点内的键位置决定的.
- 带有更多键的扩展碳水化合物配体表现出特定的方向依赖.
- 具有较少键的蛋白质显示出更广泛的自由能量场景,允许多个CH-π堆叠方向.
- 多个CH-π堆叠相互作用在过程性酶中促进了寡糖联体转位.
结论:
- 键和CH-π堆叠相互作用在蛋白质-碳水化合物结合中合作.
- 通过进化或蛋白质工程调节这些相互作用可以改变连接体的识别.
- 调整这些相互作用也可以影响酶内的连接体运动.
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