SIRT6是一种基因素H3氨酸9脱乙酶,可以调节端粒染色素
Eriko Michishita1, Ronald A McCord, Elisabeth Berber
1Department of Medicine, Division of Endocrinology, Gerontology and Metabolism, School of Medicine, Stanford University, Stanford, California 94305, USA.
Nature
|March 14, 2008
概括
与Sir2相关的蛋白质SIRT6是一种维持端粒稳定的基因组脱乙酶. 它的功能对于防止人类细胞过早衰老和端粒功能障碍至关重要.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 生物化学 生物化学
背景情况:
- 包括SIRT6在内的Sir2蛋白家族参与染色体调节.
- 小鼠SIRT6缺乏导致过早衰老,但其分子功能尚不清楚.
- 之前的研究没有发现SIRT6.6的酶活性或生理基质.
研究的目的:
- 阐明SIRT6功能背后的分子机制.
- 为了确定人类SIRT6.6的酶活性和基质.
- 研究SIRT6在端粒维护和衰老中的作用.
主要方法:
- 生物化学分析检测酶活性.
- 染色体免疫沉以评估蛋白质与端粒的关联.
- 对 SIRT6 贫乏细胞中端粒结构和功能的分析.
- 研究SIRT6与WRN蛋白的相互作用.
主要成果:
- 人类SIRT6作为一个NAD+依赖的基因素H3氨酸9 (H3K9) 脱乙酶.
- 具体来说,SIRT6与端粒相结合,并在端粒染色质中脱化H3K9.
- 消耗SIRT6会导致端粒功能障碍,染色体融合,以及过早衰老.
- 在端粒中,SIRT6是维纳综合征蛋白WRN在端粒中稳定结合的必要条件.
结论:
- SIRT6具有对端粒维持至关重要的生理基因素脱乙酶活性.
- 在哺乳动物的端粒中,SIRT6建立并传播一种特殊的染色质状态.
- 功能障碍的SIRT6有助于端粒不稳定性和过早衰老综合征,如维纳综合征.
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