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首页> 外文期刊>Molecular cell >Smad2 and Smad3 positively and negatively regulate TGF beta-dependent transcription through the forkhead DNA-binding protein FAST2.
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Smad2 and Smad3 positively and negatively regulate TGF beta-dependent transcription through the forkhead DNA-binding protein FAST2.

机译:Smad2和Smad3通过叉头DNA结合蛋白FAST2积极和消极地调节TGFβ依赖性转录。

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摘要

We identify a mammalian forkhead domain protein, FAST2, that is required for induction of the goosecoid (gsc) promoter by TGF beta or activin signaling. FAST2 binds to a sequence in the gsc promoter, but efficient transcriptional activation and assembly of a DNA-binding complex of FAST2, Smad2, and Smad4 requires an adjacent Smad4 site. Smad3 is closely related to Smad2 but suppresses activation of the gsc promoter. Inhibitory activity is conferred by the MH1 domain, which unlike that of Smad2, binds to the Smad4 site. Through competition for this shared site, Smad3 may prevent transcription by altering the conformation of the DNA-binding complex. Thus, we describe a mechanism whereby Smad2 and Smad3 positively and negatively regulate a TGF beta/activin target gene.
机译:我们确定了哺乳动物叉头域蛋白,FAST2,这是通过TGFβ或激活素信号传导诱导鹅状(gsc)启动子所需的。 FAST2与gsc启动子中的序列结合,但是FAST2,Smad2和Smad4的DNA结合复合物的有效转录激活和组装需要一个相邻的Smad4位点。 Smad3与Smad2密切相关,但抑制gsc启动子的激活。 MH1结构域具有抑制活性,与Smad2不同,它与Smad4位点结合。通过争夺该共享位点,Smad3可能通过改变DNA结合复合物的构象来阻止转录。因此,我们描述了一种机制,其中Smad2和Smad3正向和负向调节TGFβ/激活素靶基因。

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