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  • Title: Interaction between Smad anchor for receptor activation and Smad3 is not essential for TGF-beta/Smad3-mediated signaling.
    Author: Goto D, Nakajima H, Mori Y, Kurasawa K, Kitamura N, Iwamoto I.
    Journal: Biochem Biophys Res Commun; 2001 Mar; 281(5):1100-5. PubMed ID: 11243848.
    Abstract:
    Regulation of subcellular localization of Smad proteins is supposed to be critical for the effective initiation and maintenance of TGF-beta signaling. Recently, Smad anchor for receptor activation (SARA) has been identified as a Smad2 binding protein. SARA regulates the subcellular localization of Smad2 and is required for TGF-beta/Smad2-mediated signaling. In this study, we determined whether the interaction between SARA and Smad3 is essential for TGF-beta/Smad3-mediated signaling. We found that a mutant Smad3 (Smad3NS) that lacked the binding to SARA was phosphorylated by TGF-beta type I receptor at the similar level to that in wild-type Smad3 (Smad3WT). Smad3NS also formed complexes with Smad4 and translocalized into the nucleus. Moreover, Smad3NS and Smad3WT equally enhanced TGF-beta-induced transcription. Therefore, these findings indicate that, in contrast to SARA/Smad2 interaction, SARA/Smad3 interaction is not essential for TGF-beta/Smad3-mediated signaling.
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