SIRT1通过PER2脱乙化调节昼夜钟基因表达
Gad Asher1, David Gatfield, Markus Stratmann
1Department of Molecular Biology, Sciences III, University of Geneva, 30, Quai Ernest Ansermet, CH-1211 Geneva-4, Switzerland.
Cell
|July 30, 2008
概括
蛋白脱乙酶SIRT1对于昼夜节律转录至关重要. 它通过与CLOCK-BMAL1相互作用并促进PER2降解来调节核心时钟基因,将新陈代谢与身体联系起来.
科学领域:
- 时间生物学 时间生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 哺乳动物的昼夜计时系统依赖于一个涉及转录因子的分子反循环,如BMAL1和CLOCK.
- 周期 (Per) 和加密色 (Cry) 基因被BMAL1-CLOCK激活,它们的蛋白质形成复合体来抑制它们自己的转录.
研究的目的:
- 调查SIRT1,一个依赖NAD的蛋白质脱乙酸酶在核心昼夜钟基因调节中的作用.
- 阐明SIRT1影响昼夜转录和蛋白质稳定性的机制.
主要方法:
- 研究了SIRT1对核心时钟基因 (Bmal1,Rorgamma,Per2,Cry1) 的昼夜转录的要求.
- 研究了SIRT1以昼夜方式与CLOCK-BMAL1异构体的结合.
- 评估SIRT1对PER2脱乙和降解的影响.
主要成果:
- SIRT1对于关键时钟基因的高幅度昼夜转录至关重要,包括Bmal1,Rorgamma,Per2和Cry1.
- SIRT1以时间依赖的方式与CLOCK-BMAL1相互作用.
- SIRT1促进了PER2蛋白的脱乙基化和随后的降解.
结论:
- SIRT1在调节昼夜基因表达幅度方面发挥着至关重要的作用.
- SIRT1直接影响核心时钟机制中的PER2蛋白的稳定性.
- SIRT1的NAD () +依赖活性表明细胞代谢和中央昼夜时钟之间存在直接联系.
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