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Structural Basis for Specific Interaction of TGFβ Signaling Regulators SARA/Endofin with HD-PTP.
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ZFYVE9, also known as SARA (Smad anchor for receptor activation), is a double zinc finger (FYVE domain) protein that interacts directly with SMAD2 and SMAD3, and is involved in Alzheimer's disease. SARA functions to recruit SMAD2/SMAD3 to intracellular membranes and to the TGF-beta receptor. SARA plays a significant role in TGF-mediated signaling by regulating the subcellular location of SMAD2 and SMAD3 and modulating the transcriptional activity of the SMAD3/SMAD4 complex. SARA is possibly associated with TGF-beta receptor internalization.