Atypical ubiquitin E3 ligase complex Skp1-Pam-Fbxo45 controls the core epithelial-to-mesenchymal transition-inducing transcription factors.

Atypical ubiquitin E3 ligase complex Skp1-Pam-Fbxo45 controls the core epithelial-to-mesenchymal transition-inducing transcription factors.
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非典型泛素 E3 连接酶复合体 Skp1-Pam-Fbxo45 控制核心上皮间质转化诱导转录因子

DOI:
10.18632/oncotarget.2825
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发表时间:
2015-01-20
期刊:
影响因子:
--
通讯作者:
Yu J
Yu J
中科院分区:
其他
文献类型:
--
作者:
Xu M;Zhu C;Zhao X;Chen C;Zhang H;Yuan H;Deng R;Dou J;Wang Y;Huang J;Chen Q;Jiang B;Yu J

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上皮-间质转化(EMT)通过促进迁移/侵袭在肿瘤转移的发展中起关键作用。EMT的标志之一是E-cadherin表达的缺失和N-cadherin表达的增加,这受到核心EMT诱导转录因子(EMT-TF)如Zeb 1/2、Snai 1/2和Twist 1的调节。在这里,我们发现EMT-TF可以动态降解的非典型泛素E3连接酶复合物Skp 1-Pam-Fbxo 45(SPFFbxo 45)通过泛素蛋白酶体系统(UPS)。关键步骤是Fbxo 45通过其SPRY结构域识别Zeb 2,或通过F-box结构域分别识别其他三个EMT-TF Snai 1,Snai 2和Twist 1。Zeb 2上K48连接的泛素化能力依赖于其功能性SBD结构域。此外,miR-27 a * 可直接下调Fbxo 45的表达,阻止EMT-TF的降解,从而确保EMT表型。我们认为Fbxo 45是miR-27 a */Fbxo 45/EMT-TFs信号转导轴的关键节点。
Epithelial-mesenchymal transition (EMT) plays a critical role in the development of tumor metastases by enhancing migration/invasion. One of the hallmarks of EMT is loss of E-cadherin and gain of N-cadherin expression, which are regulated by the core EMT-inducing transcription factors (EMT-TFs), such as Zeb1/2, Snai1/2 and Twist1. Here, we find that EMT-TFs can be dynamically degraded by an atypical ubiquitin E3 ligase complex Skp1-Pam-Fbxo45 (SPFFbxo45) through the ubiquitin proteasome system (UPS). The key step is recognition of EMT-TFs by Fbxo45 through its SPRY domain for Zeb2, or F-box domain for the other three EMT-TFs Snai1, Snai2 and Twist1, respectively. The K48-linkaged ubiquitination capability on Zeb2 relies on its functional SBD domain. In addition, miR-27a* can directly down-regulate the expression of Fbxo45, preventing degradation of EMT-TFs and thus ensuring EMT phenotype. We suggest that Fbxo45 is a key node of the miR-27a*/Fbxo45/EMT-TFs signaling axis.
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