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XB-ART-39174
Cell. January 9, 2009; 136 (1): 123-35.

FAM/USP9x, a deubiquitinating enzyme essential for TGFbeta signaling, controls Smad4 monoubiquitination.

Dupont S , Mamidi A , Cordenonsi M , Montagner M , Zacchigna L , Adorno M , Martello G , Stinchfield MJ , Soligo S , Morsut L , Inui M , Moro S , Modena N , Argenton F , Newfeld SJ , Piccolo S .


Abstract
The assembly of the Smad complex is critical for TGFbeta signaling, yet the mechanisms that inactivate or empower nuclear Smad complexes are less understood. By means of siRNA screen we identified FAM (USP9x), a deubiquitinase acting as essential and evolutionarily conserved component in TGFbeta and bone morphogenetic protein signaling. Smad4 is monoubiquitinated in lysine 519 in vivo, a modification that inhibits Smad4 by impeding association with phospho-Smad2. FAM reverts this negative modification, re-empowering Smad4 function. FAM opposes the activity of Ectodermin/Tif1gamma (Ecto), a nuclear factor for which we now clarify a prominent role as Smad4 monoubiquitin ligase. Our study points to Smad4 monoubiquitination and deubiquitination as a way for cells to set their TGFbeta responsiveness: loss of FAM disables Smad4-dependent responses in several model systems, with Ecto being epistatic to FAM. This defines a regulative ubiquitination step controlling Smads that is parallel to those impinging on R-Smad phosphorylation.

PubMed ID: 19135894
Article link: Cell.
Grant support: CA095875 NCI NIH HHS , CA095875 NCI NIH HHS , CA095875 NCI NIH HHS , CA095875 NCI NIH HHS , CA095875 NCI NIH HHS , CA095875 NCI NIH HHS

Genes referenced: otx2 smad2 smad4.1 smad4.2 szl t tgfb1 trim33 usp9x
Antibodies referenced:
Morpholinos referenced: smad4.1 MO1 smad4.2 MO1 smad4.2 MO2 usp9x MO1
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