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一个ARC/Mediator子单元,用于SREBP控制胆固醇和脂质稳态
Fajun Yang1, Bryan W Vought, John S Satterlee
1Massachusetts General Hospital Cancer Center, Building 149, 13th Street, Charlestown, Massachusetts 02129, USA.
Nature
|June 27, 2006
概括
固醇调节元素结合蛋白 (SREBPs) 通过ARC105亚单元激活基因,这对于脂质稳定至关重要. 这项研究揭示了ARC1055.
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:
- 固醇调节元素结合蛋白 (SREBPs) 是调节胆固醇和脂肪酸代谢的关键转录因子.
- 之前的研究表明,SREBP与CREB结合蛋白 (CBP) /p300 KIX域相互作用,通过未知的机制招募联合激活体复合体.
研究的目的:
- 阐明SREBP招募联合激活体复合物的机制.
- 为了确定参与SREBP介导的基因激活的激活器招募的辅助因子 (ARC) /调解器复合物的特定子单元.
- 为了研究ARC105在脂质平衡中的作用.
主要方法:
- 核磁共振 (NMR) 谱学以确定ARC105.5中SREBP结合域的结构.
- 激活器结合域的比较分析.
- 在Caenorhabditis elegans中进行RNA干扰 (RNAi),以研究基因功能.
主要成果:
- SREBP利用ARC105 (MED15) 子单元来激活目标基因.
- 结构分析显示,ARC105具有与CBP/p300 KIX域类似的三螺旋捆绑,但对CREB和c-Myb具有不同的结合特异性.
- 在C. elegans中,ARC105同源MDT-15对于脂肪酸恒温是必不可少的,与SBP-1一起调节油酸合成.
- 油酸补充治疗了sbp-1和mdt-15RNAi线虫中的表型缺陷.
结论:
- ARC105是SREBP依赖基因调节的关键效应因子.
- ARC105亚单元在控制甲基动物之间的脂质稳定中起着保留作用.
- 转录因子和协同激活子单元之间的特定相互作用凸显了基因调节的复杂性.
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