水参与碳水化合物与蛋白质的结合
C Clarke1, R J Woods, J Gluska
1Complex Carbohydrate Research Center, 220 Riverbend Road, Athens, GA 30602, USA.
Journal of the American Chemical Society
|December 6, 2001
概括
这项研究研究了将水分子替换为trimannoside 2中的基乙基组如何影响其与Con A的结合. 这种修改改变了热力学参数,影响了蛋白质-配体复合物的稳定性.
科学领域:
- 碳水化合物的化学成分
- 生物物理化学 生物物理化学
- 结构生物学是结构生物学.
背景情况:
- 蛋白质 - 配体相互作用在生物系统中至关重要.
- 有序的水分子在调解这些相互作用方面发挥着重要作用.
- 了解结合的热力学基础是药物设计的关键.
研究的目的:
- 为了研究排序的水分子对蛋白质-连接体复合热力学的影响.
- 为了比较trimannoside 1及其衍生物trimannoside 2与Con A的结合,A.
- 阐明基乙基部分在蛋白质结合部位相互作用中的作用.
主要方法:
- 核磁共振 (NMR) 光谱用于结构分析.
- 分子动力学 (MD) 模拟以建模复杂的形成.
- 异热定位微热度计 (ITC) 用于热力学测量.
主要成果:
- 含有基乙基的三糖化2在Con A结合部位上取代了保留的水分子.
- MD模拟显示了两种连接体的类似溶液形状性质.
- ITC显示了对trimannoside 2的更有利的结合,但不那么有利的.
- 2的基乙基侧链可以形成类似于被排离的水分子所形成的键.
结论:
- 在trimannoside 2中,有序水被基乙基取代,导致结合热力学变化.
- 水位移带来的有利增长被不利的变化所抵消.
- 通过水分子的间接相互作用可以通过增加键占用率来增强蛋白质-连接体复合物的稳定性.
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