Kibra functions as a tumor suppressor protein that regulates Hippo signaling in conjunction with Merlin and Expanded.

Kibra functions as a tumor suppressor protein that regulates Hippo signaling in conjunction with Merlin and Expanded.
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DOI:
10.1016/j.devcel.2009.12.012
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发表时间:
2010-02-16
期刊:
影响因子:
11.8
通讯作者:
Pan D
Pan D
中科院分区:
生物学1区
文献类型:
--
作者:
Yu J;Zheng Y;Dong J;Klusza S;Deng WM;Pan D

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Hippo 信号通路调节从果蝇到哺乳动物的器官大小和组织稳态。该通路的核心是激酶级联反应,其中 Hippo (Hpo) 与 Salvador (Sav) 复合,磷酸化并激活 Warts (Wts),Warts (Wts) 反过来又磷酸化并灭活 Yorkie (Yki) 癌蛋白,该蛋白在哺乳动物细胞中被称为 YAP 共激活剂。 FERM 结构域蛋白 Merlin (Mer) 和 Expanded (Ex) 是通过未知机制调节 Hpo 活性的上游组件。在这里,我们将 Kibra (Kbr) 确定为 Hippo 信号通路的另一个上游组件。我们表明,Kbr 在位于上皮细胞顶端域的蛋白质复合物中与 Mer 和 Ex 一起发挥作用,并且该蛋白质复合物通过直接结合 Hpo 和 Sav 来调节 Hippo 激酶级联。这些结果揭示了 Ex 和 Mer 功能的机制,并暗示 Kbr 作为与神经纤维瘤病相关的潜在肿瘤抑制因子。
The Hippo signaling pathway regulates organ size and tissue homeostasis from Drosophila to mammals. Central to this pathway is a kinase cascade wherein Hippo (Hpo), in complex with Salvador (Sav), phosphorylates and activates Warts (Wts), which in turn phosphorylates and inactivates the Yorkie (Yki) oncoprotein, known as the YAP coactivator in mammalian cells. The FERM domain proteins Merlin (Mer) and Expanded (Ex) are upstream components that regulate Hpo activity through unknown mechanisms. Here we identify Kibra (Kbr) as another upstream component of the Hippo signaling pathway. We show that Kbr functions together with Mer and Ex in a protein complex localized to the apical domain of epithelial cells, and that this protein complex regulates the Hippo kinase cascade via direct binding to Hpo and Sav. These results shed light on the mechanism of Ex and Mer function, and implicate Kbr as a potential tumor suppressor with relevance to neurofibromatosis.
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