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. 2018 Jun 8;3:15. doi: 10.1038/s41392-018-0015-8

Fig. 5.

Fig. 5

Regulation of Ski and SnoN protein stability by the TGF-β/Smad signaling pathway. TGF-β induces Ski and SnoN protein degradation by the ubiquitin-proteasome system (UPS) after 15–30 min of treatment because activated R-Smads are adapters for ubiquitin E3-ligases APC, Smurf2, and Arkadia