在DNA上完整的PPAR-gamma-RXR-核受体复合物的结构
Vikas Chandra1, Pengxiang Huang, Yoshitomo Hamuro
1Department of Pharmacology, and Center for Molecular Design, University of Virginia Health System, 1300 Jefferson Park Avenue, Charlottesville, Virginia 22908-0735, USA.
Nature
|December 2, 2008
概括
这项研究揭示了完整的氧酶增殖器激活受体- (PPAR-) 和视网膜X受体-α (RXR-α) 异构体如何结合DNA和连接体. PPAR-gamma连接体结合域与DNA结合域合作,以增强基因调节.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 遗传学 是一个遗传学.
背景情况:
- 核受体是调节基因表达的转录因子.
- 过氧体增殖器激活受体 (PPARs) 与视网膜X受体 (RXRs) 不同体质.
- PPAR-gamma是一种与胰岛素敏感性相关的药物标,但其域合作的理解很少.
研究的目的:
- 阐明完整的PPAR-gamma/RXR-alpha异构体函数的结构基础.
- 了解多个受体域在DNA和连接体结合中如何合作.
- 提供关于PPAR-gamma在胰岛素敏感性中的作用的见解.
主要方法:
- 使用X射线晶体学来确定完整的PPAR-gamma和RXR-alpha异构体的结构.
- 这些结构被确定为复杂的DNA反应元素,连接体和联合激活.
主要成果:
- 完整的PPAR-gamma/RXR-alpha异构体形成了一个非对称的复合体.
- 三个接口连接PPAR-gamma和RXR-alpha,其中一些依赖于DNA.
- PPAR-联体结合域 (LBD) 与两个DNA结合域 (DBD) 相互作用,以增强DNA结合.
- 受体的A/B细分是高度动态的,缺乏稳定的结构.
结论:
- 结构数据揭示了一个新的受体-DNA相互作用机制,涉及域合作.
- 了解这些相互作用对于开发针对代谢疾病的向疗法至关重要.
- 尽管A/B细分的功能重要,但其动态性质需要进一步研究.
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