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Model for the E3 ubiquitin ligase activity of Arkadia induced by arsenic versus TGF-β. Upon TGF-β induction, interaction of Arkadia with phosphorylated Smad2 triggers degradation of SnoN, whereas upon arsenic treatment, interaction of Arkadia with poly-SUMO in PML nuclear bodies induces degradation of polysumoylated PML together with RNF4.
