Analysis of Dickkopf3 interactions with Wnt signaling receptors.

Analysis of Dickkopf3 interactions with Wnt signaling receptors.
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DOI:
10.3109/08977191003738832
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发表时间:
2010-08
期刊:
Growth factors (Chur, Switzerland)
影响因子:
--
通讯作者:
Hackam AS
Hackam AS
中科院分区:
其他
文献类型:
--
作者:
Nakamura RE;Hackam AS

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Wnt信号调节从胚胎发生到神经变性的基本生物学过程。最近,我们证明了Dickkopf3(Dkk3)是一种促生存糖蛋白,积极调节Wnt信号。了解Dkk3作用机制的一个重要步骤是鉴定其在Wnt途径中的相互作用蛋白。在这项研究中,我们使用了一系列的生化和功能检测,以调查Dkk3和Wnt通路受体Kremen 1(Krm1),Kremen 2(Krm2)和低密度脂蛋白受体相关蛋白6(LRP 6)之间的相互作用。在这里,我们报告说,与以前的研究相反,Dkk3与Krm1和Krm2相互作用。然而,Dkk3不与LRP6相互作用或改变LRP6的表达。阻断蛋白质糖基化没有改变Dkk3和Krm蛋白之间的相互作用。此外,Krm2消除了Dkk3介导的Wnt信号转导增强。因此,我们的数据确定Krm蛋白是Dkk3的新型结合伴侣,并提出了Dkk3增强Wnt信号传导的机制。
Wnt signaling regulates essential biological processes ranging from embryogenesis to neurodegeneration. Recently, we demonstrated that Dickkopf3 (Dkk3) is a pro-survival glycoprotein that positively modulates Wnt signaling. An important step in understanding the mechanism of action of Dkk3 is identifying its interacting proteins in the Wnt pathway. In this study, we used a series of biochemical and functional assays to investigate the interaction between Dkk3 and the Wnt pathway receptors Kremen1 (Krm1), Kremen 2 (Krm2) and low-density lipoprotein receptor-related protein 6 (LRP6). Here, we report that, contrary to previous studies, Dkk3 interacts with Krm1 and Krm2. However, Dkk3 did not interact with, or alter expression of, LRP6. Blocking protein glycosylation did not alter the interaction between Dkk3 and Krm proteins. Additionally, Krm2 abolished Dkk3-mediated potentiation of Wnt signaling. Therefore, our data establish that Krm proteins are novel binding partners of Dkk3 and suggest a mechanism by which Dkk3 potentiates Wnt signaling.
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