A poised chromatin platform for TGF-β access to master regulators.

A poised chromatin platform for TGF-β access to master regulators.
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DOI:
10.1016/j.cell.2011.11.032
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发表时间:
2011-12-23
期刊:
影响因子:
64.5
通讯作者:
Massagué J
Massagué J
中科院分区:
生物学1区
文献类型:
--
作者:
Xi Q;Wang Z;Zaromytidou AI;Zhang XH;Chow-Tsang LF;Liu JX;Kim H;Barlas A;Manova-Todorova K;Kaartinen V;Studer L;Mark W;Patel DJ;Massagué J

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特殊的染色质标记使分化的主要调节因子保持沉默,但准备被细胞外信号激活。我们报道了淋巴结TGF-β信号使用平衡的组蛋白标记H3 K9 me 3来触发哺乳动物胚胎干细胞的分化。结受体诱导形成伴随Smad 4-Smad 2/3和TRIM 33-Smad 2/3复合物。TRIM 33-Smad 2/3结合中内胚层调节剂Gsc和Mixll的启动子上的组蛋白标记H3 K9 me 3和K18 ac。结合通过TRIM 33的PHD-Bromo盒进行。在与组蛋白H3肽结合的该盒的晶体结构中,PHD识别K9 me 3和邻近的K18 ac的Bromo。TRIM 33-Smad 2/3与H3 K9 me 3的结合置换了染色质致密因子HP 1 γ,并使节点反应元件可接近Smad 4-Smad 2/3用于Pol II募集。反过来,Smad 4增加K18乙酰化以增强TRIM 33-Smad 2/3结合。因此,节点线索使用H3 K9 me 3标记作为平台,将干细胞分化的主调节因子从平衡状态切换到活性状态。
Specific chromatin marks keep master regulators of differentiation silent, yet poised for activation by extracellular signals. We report that nodal TGF-β signals use the poised histone mark H3K9me3 to trigger differentiation of mammalian embryonic stem cells. Nodal receptors induce the formation of companion Smad4-Smad2/3 and TRIM33-Smad2/3 complexes. TRIM33-Smad2/3 binds the histone marks H3K9me3 and K18ac on the promoters of mesendoderm regulators Gsc and Mixl1. Binding is through the PHD-Bromo cassette of TRIM33. In the crystal structure of this cassette bound to histone H3 peptides, PHD recognizes K9me3 and Bromo an adjacent K18ac. Binding of TRIM33-Smad2/3 to H3K9me3 displaces the chromatin compacting factor HP1γ and makes nodal response elements accessible to Smad4-Smad2/3 for Pol II recruitment. In turn, Smad4 increases K18 acetylation to augment TRIM33-Smad2/3 binding. Thus, nodal cues use the H3K9me3 mark as a platform to switch master regulators of stem cell differentiation from the poised to the active state.
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