Activated type I receptor kinase directly phosphorylates two of the C-terminal serine residues of SMAD1, SMAD5 or SMAD8. Binding of these R-SMADs to the L45 loop of the type I receptor is critical for this event.
Wrana, JL, O'Connor, MB, Stapleton, M, Attisano, L, Abdollah, S, Haerry, T, Hoodless, PA
Massague, J, Kretzschmar, M, Doody, J, Liu, F, Hata, A
transmembrane receptor protein serine/threonine kinase activity of BMP:p-BMPR:Endofin:SMAD1/5/8 [early endosome membrane]
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