Phase separation of Axin organizes the β-catenin destruction complex.

Phase separation of Axin organizes the β-catenin destruction complex.
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Axin 的相分离组织 β-连环蛋白破坏复合物

DOI:
10.1083/jcb.202012112
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发表时间:
2021-04-05
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Chen YG
Chen YG
中科院分区:
其他
文献类型:
--
作者:
Nong J;Kang K;Shi Q;Zhu X;Tao Q;Chen YG

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破坏复合体的组装对Wnt/β-连环蛋白信号转导至关重要。Nong等人的研究成果。发现Axin发生了液-液分离,这是由APC促进的。相分离的Axin为Gsk3β、Ck1α和β-catenin的募集提供了支架,并促进了Gsk3β介导的β-catenin的磷酸化,从而促进了降解。在WNT/β-连环蛋白信号转导中,β-连环蛋白的蛋白水平被有意地由多蛋白β-连环蛋白破坏复合体的组装所控制,该复合体由Axin、腺瘤性息肉病、糖原合成酶激酶3β(Gsk3β)、酪蛋白激酶1α(CK1α)等组成。在这里,我们提供了令人信服的证据,证明破坏复合体的形成是由Axin的蛋白质液-液相分离(LLP)驱动的。Axin中一个固有的无序区域在驱动其LLP方面发挥着重要作用。相分离的Axin为招募Gsk3β、Ck1α和β-catenin提供了支架。APC还在体外进行LLP,并增强轴蛋白相液滴的大小和动力学。LLPS驱动的破坏复合体的组装促进了β-连环蛋白的β磷酸化,对于调节β-连环蛋白的稳定性,从而调节WNT/β-连环蛋白信号转导至关重要。
Assembly of the destruction complex is critical for Wnt/β-catenin signaling. Nong et al. find that Axin undergoes liquid–liquid phase separation, which is promoted by APC. Phase-separated Axin provides a scaffold for recruitment of GSK3β, CK1α, and β-catenin and facilitates GSK3β-mediated β-catenin phosphorylation and thus degradation. In Wnt/β-catenin signaling, the β-catenin protein level is deliberately controlled by the assembly of the multiprotein β-catenin destruction complex composed of Axin, adenomatous polyposis coli (APC), glycogen synthase kinase 3β (GSK3β), casein kinase 1α (CK1α), and others. Here we provide compelling evidence that formation of the destruction complex is driven by protein liquid–liquid phase separation (LLPS) of Axin. An intrinsically disordered region in Axin plays an important role in driving its LLPS. Phase-separated Axin provides a scaffold for recruiting GSK3β, CK1α, and β-catenin. APC also undergoes LLPS in vitro and enhances the size and dynamics of Axin phase droplets. The LLPS-driven assembly of the destruction complex facilitates β-catenin phosphorylation by GSK3β and is critical for the regulation of β-catenin protein stability and thus Wnt/β-catenin signaling.
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