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. 1996 Nov 15;15(22):6231–6240.

Phosphorylation of Ser165 in TGF-beta type I receptor modulates TGF-beta1-induced cellular responses.

S Souchelnytskyi 1, P ten Dijke 1, K Miyazono 1, C H Heldin 1
PMCID: PMC452446  PMID: 8947046

Abstract

Transforming growth factor-beta (TGF-beta) signals via an oligomeric complex of two serine/threonine kinase receptors denoted TGF-beta type I receptor (TbetaR-I) and type II receptor (TbetaR-II). We investigated the in vivo phosphorylation sites in TbetaR-I and TbetaR-II after complex formation. Phosphorylation of TbetaR-II was observed at residues in the C-terminus (Ser549 and Ser551) and at residues in the juxtamembrane domain (Ser223, Ser226 and Ser227). TGF-beta1 induced in vivo phosphorylation of serine and threonine residues in the juxtamembrane domain of TbetaR-I in a region rich in glycine, serine and threonine residues (GS domain; Thr185, Thr186, Ser187, Ser189 and Ser191), and more N-terminal of this region (Ser165). Phosphorylation in the GS domain has been shown previously to be involved in activation of the TbetaR-I kinase. We show here that phosphorylation of TbetaR-I at Ser165 is involved in modulation of TGF-beta1 signaling. Mutations of Ser165 in TbetaR-I led to an increase in TGF-beta1-mediated growth inhibition and extracellular matrix formation, but, in contrast, to decreased TGF-beta1-induced apoptosis. A transcriptional activation signal was not affected. Mutations of Ser165 changed the phosphorylation pattern of TbetaR-I. These observations suggest that TGF-beta receptor signaling specificity is modulated by phosphorylation of Ser165 of TbetaR-I.

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Selected References

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