Decoding of methylated histone H3 tail by the Pygo-BCL9 Wnt signaling complex.

Decoding of methylated histone H3 tail by the Pygo-BCL9 Wnt signaling complex.
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DOI:
10.1016/j.molcel.2008.03.011
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发表时间:
2008-05-23
期刊:
影响因子:
16
通讯作者:
Bienz, Mariann
Bienz, Mariann
中科院分区:
生物学1区
文献类型:
--
作者:
Fiedler, Marc;Sanchez-Barrena, Maria Jose;Nekrasov, Maxim;Mieszczanek, Juliusz;Rybin, Vladimir;Mueller, Juerg;Evans, Phil;Bienz, Mariann

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Pygo 和 BCL9/Legless 通过促进正常和恶性细胞中 β-catenin/Armadillo 的转录活性来转导 Wnt 信号。我们表明,人类和果蝇 Pygo PHD 手指与 BCL9/Legless 的同源 HD1 结构域相关联,特异性结合赖氨酸 4 甲基化的组蛋白 H3 尾部 (H3K4me)。 PHD、HD1 和两种不同 H3K4me 肽之间的三元复合物的晶体结构揭示了组蛋白尾部识别的独特模式:有效的组蛋白结合需要 HD1 缔合,并且 PHD-HD1 复合物优先与 H3K4me2 结合,同时对 H3R2 甲基化不敏感。因此,这是由辅助因子 (BCL9/Legless) 调节的 PHD Finger (Pygo) 与组蛋白尾部结合的一个主要例子。果蝇救援实验表明 Wnt 信号输出依赖于组蛋白解码。 Pygo-BCL9/Legless 复合体提供的这一过程的特异性表明,该复合体促进了从基因沉默向 Wnt 诱导转录转变的早期步骤。
Pygo and BCL9/Legless transduce the Wnt signal by promoting the transcriptional activity of β-catenin/Armadillo in normal and malignant cells. We show that human and Drosophila Pygo PHD fingers associate with their cognate HD1 domains from BCL9/Legless to bind specifically to the histone H3 tail methylated at lysine 4 (H3K4me). The crystal structures of ternary complexes between PHD, HD1, and two different H3K4me peptides reveal a unique mode of histone tail recognition: efficient histone binding requires HD1 association, and the PHD-HD1 complex binds preferentially to H3K4me2 while displaying insensitivity to methylation of H3R2. Therefore, this is a prime example of histone tail binding by a PHD finger (of Pygo) being modulated by a cofactor (BCL9/Legless). Rescue experiments in Drosophila indicate that Wnt signaling outputs depend on histone decoding. The specificity of this process provided by the Pygo-BCL9/Legless complex suggests that this complex facilitates an early step in the transition from gene silence to Wnt-induced transcription.
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