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Swift Is a Novel BRCT Domain Coactivator of Smad2 in Transforming Growth Factor β Signaling

机译:Swift是Smad2在转化生长因子β信号传导中的新型BRCT域共激活因子。

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Transforming growth factor β (TGFβ) signaling is transduced via Smad2–Smad4–DNA-binding protein complexes which bind to responsive elements in the promoters of target genes. However, the mechanism of how the complexes activate the target genes is unclear. Here we identify Xenopus Swift, a novel nuclear BRCT (BRCA1 C-terminal) domain protein that physically interacts with Smad2 via its BRCT domains. We examine the activity of Swift in relation to gene activation in Xenopus embryos. Swift mRNA has an expression pattern similar to that of Smad2. Swift has intrinsic transactivation activity and activates target gene transcription in a TGFβ-Smad2-dependent manner. Inhibition of Swift activity results in the suppression of TGFβ-induced gene transcription and defective mesendoderm development. Blocking Swift function affects neither bone morphogenic protein nor fibroblast growth factor signaling during early development. We conclude that Swift is a novel coactivator of Smad2 and that Swift has a critical role in embryonic TGFβ-induced gene transcription. Our results suggest that Swift may be a general component of TGFβ signaling.
机译:转化生长因子β(TGFβ)信号通过Smad2-Smad4-DNA结合蛋白复合物转导,该复合物与靶基因启动子中的响应元件结合。但是,复合物如何激活靶基因的机制尚不清楚。在这里,我们确定了非洲爪蟾(Xenopus) Swift,这是一种新型的核BRCT(BRCA1 C端)域蛋白,可通过其BRCT域与Smad2进行物理相互作用。我们检查了非洲爪蟾胚胎中Swift与基因激活相关的活性。 Swift mRNA的表达模式与 Smad2 相似。 Swift具有固有的反式激活活性,并以TGFβ-Smad2依赖性方式激活靶基因转录。 Swift活性的抑制导致TGFβ诱导的基因转录的抑制和中胚层发育的缺陷。在早期发育过程中,阻断Swift功能不会影响骨形态发生蛋白或成纤维细胞生长因子信号传导。我们得出的结论是,Swift是Smad2的新型共激活因子,并且Swift在胚胎TGFβ诱导的基因转录中具有关键作用。我们的结果表明,Swift可能是TGFβ信号传导的一般组成部分。

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