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TGFbeta-stimulated Smad1/5 phosphorylation requires the ALK5 L45 loop and mediates the pro-migratory TGFbeta switch.

Publication ,  Journal Article
Liu, IM; Schilling, SH; Knouse, KA; Choy, L; Derynck, R; Wang, X-F
Published in: EMBO J
January 21, 2009

During the course of breast cancer progression, normally dormant tumour-promoting effects of transforming growth factor beta (TGFbeta), including migration, invasion, and metastasis are unmasked. In an effort to identify mechanisms that regulate the pro-migratory TGFbeta 'switch' in mammary epithelial cells in vitro, we found that TGFbeta stimulates the phosphorylation of Smad1 and Smad5, which are typically associated with bone morphogenetic protein signalling. Mechanistically, this phosphorylation event requires the kinase activity and, unexpectedly, the L45 loop motif of the type I TGFbeta receptor, ALK5, as evidenced by studies using short hairpin RNA-resistant ALK5 mutants in ALK5-depleted cells and in vitro kinase assays. Functionally, Smad1/5 co-depletion studies demonstrate that this phosphorylation event is essential to the initiation and promotion of TGFbeta-stimulated migration. Moreover, this phosphorylation event is preferentially detected in permissive environments such as those created by tumorigenic cells or oncogene activation. Taken together, our data provide evidence that TGFbeta-stimulated Smad1/5 phosphorylation, which occurs through a non-canonical mechanism that challenges the notion of selective Smad phosphorylation by ALK5, mediates the pro-migratory TGFbeta switch in mammary epithelial cells.

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Published In

EMBO J

DOI

EISSN

1460-2075

Publication Date

January 21, 2009

Volume

28

Issue

2

Start / End Page

88 / 98

Location

England

Related Subject Headings

  • Transforming Growth Factor beta
  • Smad5 Protein
  • Smad1 Protein
  • Signal Transduction
  • Receptors, Transforming Growth Factor beta
  • Receptor, Transforming Growth Factor-beta Type I
  • Protein Serine-Threonine Kinases
  • Protein Isoforms
  • Protein Binding
  • Phosphorylation
 

Citation

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Liu, I. M., Schilling, S. H., Knouse, K. A., Choy, L., Derynck, R., & Wang, X.-F. (2009). TGFbeta-stimulated Smad1/5 phosphorylation requires the ALK5 L45 loop and mediates the pro-migratory TGFbeta switch. EMBO J, 28(2), 88–98. https://doi.org/10.1038/emboj.2008.266
Liu, Irwin M., Stephen H. Schilling, Kristin A. Knouse, Lisa Choy, Rik Derynck, and Xiao-Fan Wang. “TGFbeta-stimulated Smad1/5 phosphorylation requires the ALK5 L45 loop and mediates the pro-migratory TGFbeta switch.EMBO J 28, no. 2 (January 21, 2009): 88–98. https://doi.org/10.1038/emboj.2008.266.
Liu IM, Schilling SH, Knouse KA, Choy L, Derynck R, Wang X-F. TGFbeta-stimulated Smad1/5 phosphorylation requires the ALK5 L45 loop and mediates the pro-migratory TGFbeta switch. EMBO J. 2009 Jan 21;28(2):88–98.
Liu, Irwin M., et al. “TGFbeta-stimulated Smad1/5 phosphorylation requires the ALK5 L45 loop and mediates the pro-migratory TGFbeta switch.EMBO J, vol. 28, no. 2, Jan. 2009, pp. 88–98. Pubmed, doi:10.1038/emboj.2008.266.
Liu IM, Schilling SH, Knouse KA, Choy L, Derynck R, Wang X-F. TGFbeta-stimulated Smad1/5 phosphorylation requires the ALK5 L45 loop and mediates the pro-migratory TGFbeta switch. EMBO J. 2009 Jan 21;28(2):88–98.

Published In

EMBO J

DOI

EISSN

1460-2075

Publication Date

January 21, 2009

Volume

28

Issue

2

Start / End Page

88 / 98

Location

England

Related Subject Headings

  • Transforming Growth Factor beta
  • Smad5 Protein
  • Smad1 Protein
  • Signal Transduction
  • Receptors, Transforming Growth Factor beta
  • Receptor, Transforming Growth Factor-beta Type I
  • Protein Serine-Threonine Kinases
  • Protein Isoforms
  • Protein Binding
  • Phosphorylation