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首页> 外文期刊>Molecular cell >The Ubiquitin Ligase Siah1 Controls ELL2 Stability and Formation of Super Elongation Complexes to Modulate Gene Transcription
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The Ubiquitin Ligase Siah1 Controls ELL2 Stability and Formation of Super Elongation Complexes to Modulate Gene Transcription

机译:泛素连接酶Siah1控制ELL2的稳定性和超伸长复合物的形成,以调节基因转录。

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摘要

Super . elongation . complexes (SECs) contain two different transcription elongation factors, P-TEFb and ELL1/2, linked by the scaffolding protein AFF4 or AFF1. They stimulate the expression of both normal and disease-related genes, especially those of HIV or those involved in leukemogenesis. Among all SEC subunits, ELL2 is stoichiometrically limiting and uniquely regulated at the level of protein stability. Here we identify the RING domain protein Siah1, but not the homologous Siah2, as the E3 ubiquitin ligase for ELL2 polyubiquitination and proteasomal degradation. Siah1 cannot access and ubiquitinate ELL2 bound to AFF4, although, at high concentrations, it also degrades AFF4/1 to destroy SECs. Prostratin and HMBA, two well-studied activators of HIV transcription and latency, enhance ELL2 accumulation and SECs formation largely through decreasing Siah1 expression and ELL2 polyubiquitination. Given its importance in formation of SECs, the Siah1 ubiquitination pathway provides a fresh avenue for developing strategies to control disease-related transcription.
机译:超级。伸长率。复合物(SEC)包含两个不同的转录延伸因子,P-TEFb和ELL1 / 2,通过支架蛋白AFF4或AFF1连接。它们刺激正常基因和疾病相关基因的表达,特别是HIV基因或涉及白血病发生的基因。在所有SEC亚基中,ELL2在化学计量上受到限制,并且在蛋白质稳定性水平上受到独特调节。在这里,我们将RING域蛋白Siah1(而不是同源Siah2)识别为E3泛素连接酶,用于ELL2多泛素化和蛋白酶体降解。 Siah1无法访问和泛素化与AFF4结合的ELL2,尽管在高浓度下它也会降解AFF4 / 1从而破坏SEC。 Prostratin和HMBA,这两个经过充分研究的HIV转录和潜伏期激活因子,主要通过降低Siah1表达和ELL2多聚泛素化来增强ELL2积累和SEC的形成。鉴于其在SEC形成中的重要性,Siah1泛素化途径为开发控制疾病相关转录的策略提供了新途径。

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