Negative regulation of transforming growth factor-beta (TGF-beta) signaling by WW domain-containing protein 1 (WWP1)

Oncogene
Akiyoshi KomuroKeiji Miyazawa

Abstract

Smad7 negatively regulates transforming growth factor (TGF)-beta superfamily signaling by binding to activated type I receptors, thereby preventing the phosphorylation of receptor-regulated Smads (R-Smads), as well as by recruiting HECT-type E3 ubiquitin ligases to degrade type I receptors through a ubiquitin-dependent mechanism. To elucidate the regulatory mechanisms of TGF-beta signaling, we searched for novel members of proteins that interact with Smad7 using a yeast two-hybrid system. One of the proteins identified was the WW domain-containing protein 1 (WWP1) that is structurally related to Smad ubiquitin regulatory factors (Smurfs), E3 ubiquitin ligases for Smads and TGF-beta superfamily receptors. Using a TGF-beta-responsive reporter in mammalian cells, we found that WWP1 inhibited transcriptional activities induced by TGF-beta. Similar to Smurfs, WWP1 associated with Smad7 and induced its nuclear export, and enhanced binding of Smad7 to TGF-beta type I receptor to cause ubiquitination and degradation of the receptor. Consistent with these results, WWP1 inhibited phosphorylation of Smad2 induced by TGF-beta. WWP1 thus negatively regulates TGF-beta signaling in cooperation with Smad7. However, unlike Smurfs, WWP1 failed t...Continue Reading

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