| Literature DB >> 17276978 |
Taisuke Kajino1, Emily Omori, Shunsuke Ishii, Kunihiro Matsumoto, Jun Ninomiya-Tsuji.
Abstract
Transforming growth factor-beta (TGF-beta) regulates a variety of physiologic processes through essential intracellular mediators Smads. The SnoN oncoprotein is an inhibitor of TGF-beta signaling. SnoN recruits transcriptional repressor complex to block Smad-dependent transcriptional activation of TGF-beta-responsive genes. Following TGF-beta stimulation, SnoN is rapidly degraded, thereby allowing the activation of TGF-beta target genes. Here, we report the role of TAK1 as a SnoN protein kinase. TAK1 interacted with and phosphorylated SnoN, and this phosphorylation regulated the stability of SnoN. Inactivation of TAK1 prevented TGF-beta-induced SnoN degradation and impaired induction of the TGF-beta-responsive genes. These data suggest that TAK1 modulates TGF-beta-dependent cellular responses by targeting SnoN for degradation.Entities:
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Year: 2007 PMID: 17276978 PMCID: PMC2175395 DOI: 10.1074/jbc.M700875200
Source DB: PubMed Journal: J Biol Chem ISSN: 0021-9258 Impact factor: 5.157