通过K494修改RE-1沉默转录因子的SIRT6依赖功能开关
Adam Zaretsky1,2, Alfredo Garcia Venzor1,2, Ekaterina Eremenko1,2
1Department of Life Sciences, Ben-Gurion University of the Negev, Beer Sheva, 8410501, Israel.
Cell death & disease
|November 7, 2024
概括
依赖NAD的脱乙酶SIRT6调节RE-1沉默转录因子 (REST) 的活性. 失去SIRT6会导致REST变得有毒,影响神经元基因表达,并导致神经退行.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- RE-1沉默转录因子 (REST) 抑制神经基因,并与老化和神经退行性疾病 (如阿尔茨海默氏症) 有关.
- 在阿尔茨海默病中引起REST功能障碍的确切机制尚不清楚.
- 已知SIRT6,一种依赖NAD的脱乙酶,随着年龄的增长而下降.
研究的目的:
- 研究SIRT6在REST表达,定位和活动中的调控作用.
- 在SIRT6缺乏的背景下阐明REST功能障碍背后的分子机制.
- 了解SIRT6-REST相互作用对衰老和神经退行性疾病的影响.
主要方法:
- 使用了具有和没有SIRT6 (SIRT6 KO细胞) 的细胞模型.
- 分析了REST表达,亚细胞局部化 (细胞质,核,异色素) 和与EZH2.2的相互作用.
- 通过使用特定突变物,研究了REST K494中翻译后修饰 (乙化和甲基化) 的影响.
- 评估了对REST目标基因表达的影响.
主要成果:
- 缺少SIRT6导致REST过度表达,但错位于细胞质,以及与EZH2.2的相互作用受损.
- 在缺少SIRT6的细胞中,REST错位化和乙化,而不是甲基化,导致抑制功能的丧失和毒性.
- SIRT6重新引入或表达甲基化模仿的REST突变物拯救了表型.
- 衰老期间SIRT6水平的下降加剧了REST功能障碍,导致神经毒性.
结论:
- 通过翻译后的修改,SIRT6作为REST功能的关键调节者,特别是K494.4的甲基化.
- 缺少SIRT6会破坏REST的适当局部化和与EZH2的相互作用,导致有毒的功能增益.
- 与年龄相关的SIRT6的下降可能会导致REST介导的神经毒性在病态衰老和阿尔茨海默病.
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