RNF111 (Arkadia) polyubiquitinates SMAD7 (Koinuma et al. 2003). This was inferred from studies using recombinant mouse Smad7 and recombinant mouse Rnf111 expressed in human embryonic kidney cell line HEK293.
Miyazono, K, Goto, K, Shinozaki, M, Imamura, T, Nukiwa, T, Komuro, A, Ebina, M, Miyazawa, K, Saitoh, M, Hanyu, A, Koinuma, D
ubiquitin-protein transferase activity of SMAD7:RNF111 [nucleoplasm]
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