The structural basis of direct glucocorticoid-mediated transrepression.

The structural basis of direct glucocorticoid-mediated transrepression.
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DOI:
10.1038/nsmb.2456
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发表时间:
2013-01
影响因子:
16.8
通讯作者:
Ortlund, Eric A.
Ortlund, Eric A.
中科院分区:
生物学1区
文献类型:
--
作者:
Hudson, William H.;Youn, Christine;Ortlund, Eric A.

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一种新发现的负性糖皮质激素反应元件(nGRE)介导糖皮质激素受体(GR)跨基因组的DNA依赖性反式阻遏,并在免疫抑制治疗中发挥重要作用。nGRE与激活反应元件显著不同,驱动GR结合和反式阻遏的机制尚不清楚。要解开的糖皮质激素受体的nGRE介导的反式阻遏的机制,我们的特点之间的相互作用GR和nGRE在胸腺基质淋巴细胞(TSLP)启动子。我们表明,使用结构和机械的方法,nGRE结合代表了一种新的模式,由人类GR的序列识别和nGRES防止受体二聚化通过一个独特的GR结合方向和强大的负协同性,确保单体GR的抑制元素的存在。
A newly discovered negative glucocorticoid response element (nGRE) mediates DNA-dependent transrepression by the glucocorticoid receptor (GR) across the genome and plays a major role in immunosuppressive therapy. The nGRE differs dramatically from activating response elements and the mechanism driving GR binding and transrepression is unknown. To unravel the mechanism of nGRE-mediated transrepression by the glucocorticoid receptor, we characterize the interaction between GR and a nGRE in the thymic stromal lymphopoetin (TSLP) promoter. We show using structural and mechanistic approaches that nGRE binding represents a new mode of sequence recognition by human GR and that nGREs prevent receptor dimerization through a unique GR-binding orientation and strong negative cooperativity, ensuring the presence of monomeric GR at repressive elements.
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