由于与阿尔茨海默病相关的变体,TREM2的多重化受损
Hunter B Dean1,2,3, Rory A Greer1, Shan-Zhong Yang1
1Department of Biomedical Engineering, School of Engineering, University of Alabama at Birmingham, Birmingham, Alabama, USA.
概括
阿尔茨海默氏病的风险与TREM2变异有关,这些变异破坏了其稳定的三元体形成. 一个关键的盐桥,D87-R76,被AD变体破坏,损害了TREM2功能.
科学领域:
- 神经科学是一个神经科学.
- 免疫学 免疫学 免疫学
- 生物化学 生化学
背景情况:
- 在骨髓细胞2 (TREM2) 上表达的触发受体是阿尔茨海默病 (AD) 的重要遗传风险因素.
- TREM2多元化与抗体治疗疗效有关,但其分子基础尚不清楚.
- 了解TREM2多元化对于开发有效的AD疗法至关重要.
研究的目的:
- 阐明TREM2多元化背后的分子机制.
- 调查阿尔茨海默病相关变异对TREM2多元化的影响.
- 确定TREM2寡合化的结构基础及其功能后果.
主要方法:
- 用分子动力学模拟来分析TREM2相互作用.
- 使用绑定能量分析来量化AD变体的影响.
- 同免疫沉试验验证实了计算结果的实验性验证.
主要成果:
- TREM2主要通过D87和R76残留物之间的盐桥形成稳定的trimers.
- 与AD相关的R47H和R98W变种破坏了这个关键的D87-R76盐桥.
- D87N变种完全取消了D87-R76盐桥,大大减少了TREM2多元化.
结论:
- 已经发现了稳定的TREM2三元体形成的分子基础.
- 由于AD变体破坏D87-R76盐桥,会损害TREM2的寡合化和功能.
- 这提供了一种新的机制,TREM2变种有助于阿尔茨海默病风险.
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