alexa The WW domain protein Kibra acts upstream of Hippo in Drosophila.
Oncology

Oncology

Journal of Carcinogenesis & Mutagenesis

Author(s): Baumgartner R, Poernbacher I, Buser N, Hafen E, Stocker H

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Abstract The conserved Hippo kinase pathway plays a pivotal role in organ size control and tumor suppression by restricting proliferation and promoting apoptosis. Whereas the function of the core kinase cascade, consisting of the serine/threonine kinases Hippo and Warts, in phosphorylating and thereby inactivating the transcriptional coactivator Yorkie is well established, much less is known about the upstream events that regulate Hippo signaling activity. The FERM domain proteins Expanded and Merlin appear to represent two different signaling branches that feed into the Hippo pathway. Signaling by the atypical cadherin Fat may act via Expanded, but how Merlin is regulated has remained elusive. Here, we show that the WW domain protein Kibra is a Hippo signaling component upstream of Hippo and Merlin. Kibra acts synergistically with Expanded, and it physically interacts with Merlin. Thus, Kibra predominantly acts in the Merlin branch upstream of the core kinase cascade to regulate Hippo signaling. Copyright (c) 2010 Elsevier Inc. All rights reserved. This article was published in Dev Cell and referenced in Journal of Carcinogenesis & Mutagenesis

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