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Critical scaffolding regions of the tumor suppressor Axin1 are natively unfolded.

机译:肿瘤抑制因子Axin1的关键支架区域自然展开。

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摘要

The Wnt pathway tumor-suppressor protein Axin coordinates the formation of a critical multiprotein destruction complex that serves to downregulate beta-catenin protein levels, thereby preventing target gene activation. Given the lack of structural information on some of the major functional parts of Axin, it remains unresolved how the recruitment and positioning of Wnt pathway kinases, such as glycogen synthase kinase 3beta, are coordinated to bring about beta-catenin phosphorylation. Using various biochemical and biophysical methods, we demonstrate here that the central region of Axin that is implicated in binding glycogen synthase kinase 3beta and beta-catenin is natively unfolded. Our results support a model in which the unfolded nature of these critical scaffolding regions in Axin facilitates dynamic interactions with a kinase and its substrate, which in turn act upon each other.
机译:Wnt途径的肿瘤抑制蛋白Axin协调关键的多蛋白破坏复合物的形成,该复合物可下调β-catenin蛋白的水平,从而阻止靶基因的激活。由于缺乏关于Axin某些主要功能部分的结构信息,如何解决Wnt途径激酶(例如糖原合酶激酶3beta)的募集和定位如何协调以引起β-catenin磷酸化尚待解决。使用各种生化和生物物理方法,我们在这里证明与结合糖原合酶激酶3beta和β-catenin牵连的Axin的中央区域是天然展开的。我们的结果支持一种模型,其中Axin中这些关键支架区域的未折叠性质促进了与激酶及其底物的动态相互作用,而后者又相互作用。

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