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Characterization of SMAD Phosphorylation and SMAD/Receptor Interaction

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Signaling by transforming growth factor-(β superfamily members is initiated when ligand binds to and induces formation of a heteromeric receptor complex composed of type I and type II serine/threonine kinase receptors (reviewed in refs. 1 4 ). Upon formation of this complex, receptor II phosphorylates receptor I in a highly conserved juxtamembrane region, known as the GS domain. Phosphorylated receptor I is then activated to phosphorylate its downstream targets, the members of the Smad family of proteins. These Smads are now known to be the critical intracellular mediators of TGF-(β superfamily signaling (reviewed in refs. 1 4 ).
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