O-GlcNAcα-Synuclein的修饰可以改变单体动力学以控制聚合动力学
Kasun Gamage1, Binyou Wang2, Eldon R Hard2
1Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, United States.
ACS chemical neuroscience
|July 31, 2024
概括
翻译后的修改,如O-GlcNAcylation,对α-Synuclein聚合有不同的影响. 在T72的糖化减缓了聚合,而S87可能会加速早期阶段,表明修改不会在神经退行性疾病中均地影响蛋白质凝聚.
科学领域:
- 神经科学是一个神经科学.
- 生物化学 生化学
- 结构生物学 结构生物学
背景情况:
- 阿尔法-同核素 (α-Syn) 聚合是帕金森病发病的核心.
- 翻译后修改 (PTMs) 影响α-Syn聚合动力学.
- 据报道,α-Syn的O-GlcNAcylation可以抑制其聚合.
研究的目的:
- 为了研究O-GlcNAcylated α-Synuclein在T72和S87.7的单体动力学.
- 为了将这些动态与聚合动力学相关联.
- 了解特定的PTM如何影响α-Syn聚合倾向.
主要方法:
- 对未经修改的α-Syn (gT72) 和α-Syn (gS87) 的分子动力学模拟.
- 蛋白质紧密性和扩散的分析.
- 提奥夫拉T (ThT) 光测量以监测纤维的形成.
主要成果:
- 在T72的糖基化增加了α-Syn单体的扩散,并降低了紧度.
- 在S87的糖化降低了α-Syn单体扩散,并增加了紧性.
- 与未经修改的α-Syn.相比,ThT测定证实了α-Syn.gT72的聚合速度较慢.
- S87修改预测了更快的早期聚合,尽管在后期的ThT动力学中没有完全反映.
结论:
- 翻译后的修改对α-Syn聚合产生不均的影响.
- 单体动态对于确定聚合倾向至关重要.
- 在神经退行性疾病中,PTMs可以差异调节α-Syn聚合的风险.
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