Nuclear Dvl, c-Jun, beta-catenin, and TCF form a complex leading to stabilization of beta-catenin-TCF interaction.

Nuclear Dvl, c-Jun, beta-catenin, and TCF form a complex leading to stabilization of beta-catenin-TCF interaction.
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DOI:
10.1083/jcb.200710050
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发表时间:
2008-03-24
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Li L
Li L
中科院分区:
其他
文献类型:
--
作者:
Gan XQ;Wang JY;Xi Y;Wu ZL;Li YP;Li L

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在经典Wnt信号通路中,蓬乱蛋白(Dvl)是一种关键的细胞质调节因子,它可使β-连环蛋白免于降解。在此,我们发现Dvl和c - Jun在Wnt靶基因的启动子上与β-连环蛋白 - T细胞因子4(TCF - 4)形成复合物并调节基因转录。该复合物通过核内Dvl分别与c - Jun和β-连环蛋白的两种相互作用形成,这两者都与TCF结合。破坏Dvl与c - Jun或β-连环蛋白的相互作用会抑制经典Wnt信号通路刺激的转录,并且体内Dvl的减少会减弱β-连环蛋白 - TCF - 4在Wnt靶基因启动子上的结合。TCF - Dvl融合蛋白的表达在很大程度上挽救了哺乳动物细胞和斑马鱼中c - Jun敲低所导致的Wnt信号缺陷。因此,我们证实c - Jun在经典Wnt信号通路中发挥作用,并表明c - Jun在β-连环蛋白 - TCFs转录复合物中作为一种支架发挥作用,将Dvl与TCF连接起来。我们的研究结果揭示了一种机制,即核内Dvl与c - Jun协同调节经典Wnt信号通路所刺激的基因转录。
In canonical Wnt signaling, Dishevelled (Dvl) is a critical cytoplasmic regulator that releases β-catenin from degradation. Here, we find that Dvl and c-Jun form a complex with β-catenin–T-cell factor 4 (TCF-4) on the promoter of Wnt target genes and regulate gene transcription. The complex forms via two interactions of nuclear Dvl with c-Jun and β-catenin, respectively, both of which bind to TCF. Disrupting the interaction of Dvl with either c-Jun or β-catenin suppresses canonical Wnt signaling–stimulated transcription, and the reduction of Dvl diminished β-catenin–TCF-4 association on Wnt target gene promoters in vivo. Expression of a TCF-Dvl fusion protein largely rescued the c-Jun knockdown Wnt signaling deficiency in mammalian cells and zebrafish. Thus, we confirm that c-Jun functions in canonical Wnt signaling and show that c-Jun functions as a scaffold in the β-catenin–TCFs transcription complex bridging Dvl to TCF. Our results reveal a mechanism by which nuclear Dvl cooperates with c-Jun to regulate gene transcription stimulated by the canonical Wnt signaling pathway.
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