小分子与DNA小沟的结合是由保存的水集群介导的
DengGuo Wei1, W David Wilson, Stephen Neidle
1UCL School of Pharmacy, 29-39 Brunswick Square, London WC1N 1AX, United Kingdom.
Journal of the American Chemical Society
|January 2, 2013
概括
在DNA小沟中保存的水集群稳定了小分子的结合. 这种水化网络与水化脊柱不同,对于连接体的定位至关重要,并解释了结合亲和关系.
科学领域:
- 结构生物学 结构生物学
- 生物化学 生物化学
- 分子生物物理学 分子生物物理学
背景情况:
- DNA小槽是小分子的关键结合点,包括治疗剂.
- 了解水在DNA - 连接体相互作用中的作用对于药物设计至关重要.
- 之前的研究已经在B-DNA小沟中发现了"补水脊柱".
研究的目的:
- 阐明水分子在DNA复杂化中的结构作用与小沟结合连接体.
- 描述DNA小槽中A/T丰富区域的保存水集群.
- 为了将水集群结构与连接体结合亲和力和热力学联系起来.
主要方法:
- 高分辨率的DNA - 连接体复合物的X射线晶体学.
- 在DNA小沟内对水网络的结构分析.
- 本地DNA结构与联结状态的比较.
主要成果:
- 在原生和联结DNA结构中确定了11个连接的水分子的保存集群.
- 这个水集群位于小沟的A / T丰富的扩大区域.
- 水集群与DNA骨干酸盐和结合的连接体形成了广泛的键,稳定了连接体结合.
- 已识别的水集群与水化脊柱不同,但与其相关,水化脊柱是由连接体取代的.
结论:
- 一个新的水集群在稳定B-DNA小沟中的非共结合的小分子中发挥着关键的结构作用.
- 这种水化网络调解DNA和配体之间的相互作用,影响结合亲和力和热力学.
- 这些发现提供了对DNA连接体识别分子机制的见解,并为合理的药物设计提供了基础,以AT丰富的DNA位点为目标.
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