在Abeta10-35单体中形成Asp23-Lys28盐桥的动力学
Bogdan Tarus1, John E Straub, D Thirumalai
1Department of Chemistry, Boston University, Boston, Massachusetts 02215, USA.
Journal of the American Chemical Society
|December 15, 2006
概括
研究了粉样β蛋白 (Abeta蛋白) D23-K28盐桥形成. 分子动力学模拟表明,水排放有助于阿贝塔的寡合化和稳定结构.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 计算化学计算化学
背景情况:
- 粉样β蛋白 (Abeta蛋白) 形成纤维细胞,是阿尔茨海默病的核心.
- 纤维中的单体结构遵循自我组织原理,最大限度地增加接触和盐桥.
- 内部分子盐桥,如Asp{D}23-Lys{K}28,对于稳定性至关重要.
研究的目的:
- 在孤立的Abeta10-35单体中调查自发的D23-K28盐桥形成.
- 了解水和形状动态在早期阿贝塔寡合化中的作用.
主要方法:
- 全原子分子动力学模拟在明确的水.
- 在五个独立的轨迹上进行100 ns的模拟时间.
- 自由能量计算和结构分析.
主要成果:
- 模拟协议通过与实验数据一致计算的pKa值进行验证.
- 确定了四个具有0.32.7 kcal/mol的自由能量障碍的构造盆地.
- 稳定的D23-K28盐桥和VGSN转是由于溶解处罚而造成的次要元件.
结论:
- 早期的阿贝塔寡合化可能涉及水的驱逐.
- 互相互作用的促进形成驱动了具有D23-K28盐桥和VGSN转的稳定结构.
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