溶剂网络 调整蛋白质结合部位中的寡糖化合物复合的热力学
Sonja Kunstmann1,2, Ulrich Gohlke3, Nina K Broeker1
1Physikalische Biochemie , Universität Potsdam , Karl-Liebknecht-Str. 24-25 , 14476 Potsdam , Germany.
Journal of the American Chemical Society
|July 26, 2018
概括
由于溶剂的作用,了解蛋白质-甘氨酸的相互作用是具有挑战性的. 这项研究揭示了大肠杆菌尾尖蛋白 (TSP) 的特定口袋中的水分子如何关键地影响结合热力学,即使在大型结合部位.
科学领域:
- 生物化学
- 结构生物学
- 计算生物学
背景情况:
- 在分子水平上,蛋白质与糖的结合原理尚不清楚.
- 缺乏模型系统和溶剂影响的复杂性阻碍了对糖识别的研究.
- 大肠杆菌菌体HK620的尾尖蛋白 (TSP) 为研究这些相互作用提供了一个模型系统.
研究的目的:
- 调查溶剂在蛋白质甘油复合物形成中的能量贡献.
- 阐明水分子在HK620TSP的结合热力学中的作用.
- 了解结构特征和溶剂效应如何决定糖结合性和特异性.
主要方法:
- 对HK620TSP高亲和性突变的实验性表征.
- 蛋白质-寡糖化合物的晶体结构分析.
- 分子动力学模拟和自由能量计算以评估溶剂贡献.
主要成果:
- 尽管有结构上的差异,但突变者对六糖和五糖碎片具有相似的亲和力.
- 热力学结合特征在突变者之间有显著差异,表明非拓影响.
- 分子动力学揭示了广泛的溶剂网络,其中葡萄糖口袋中的小水网络是最有影响力的.
- 水位移能量与口袋入口的氨基酸残留相关,解释了力-力补偿.
结论:
- 一些战略位置的水分子可以显著地主导蛋白质-甘氨酸结合的热力学特征.
- 这些发现扩展了对溶剂在分子识别中的作用的理解,超越了小分子到复杂的甘氨酸.
- 这项研究强调了在蛋白质-甘氨酸相互作用模型中考虑溶剂动态的重要性.
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