The type I TGF-β receptor engages TRAF6 to activate TAK1 in a receptor kinase-independent manner (original) (raw)

Nature Cell Biology volume 10, pages 1199–1207 (2008)Cite this article

Abstract

Transforming growth factor-β (TGF-β) is a multifunctional cytokine that regulates embryonic development and tissue homeostasis; however, aberrations of its activity occur in cancer1,2. TGF-β signals through its Type II and Type I receptors (TβRII and TβRI) causing phosphorylation of Smad proteins3,4. TGF-β-associated kinase 1 (TAK1), a member of the mitogen-activated protein kinase kinase kinase (MAPKKK) family, was originally identified as an effector of TGF-β-induced p38 activation5. However, the molecular mechanisms for its activation are unknown. Here we report that the ubiquitin ligase (E3) TRAF6 interacts with a consensus motif present in TβRI. The TβRI–TRAF6 interaction is required for TGF-β-induced autoubiquitylation of TRAF6 and subsequent activation of the TAK1–p38/JNK pathway, which leads to apoptosis. TβRI kinase activity is required for activation of the canonical Smad pathway, whereas E3 activity of TRAF6 regulates the activation of TAK1 in a receptor kinase-independent manner. Intriguingly, TGF-β-induced TRAF6-mediated Lys 63-linked polyubiquitylation of TAK1 Lys 34 correlates with TAK1 activation. Our data show that TGF-β specifically activates TAK1 through interaction of TβRI with TRAF6, whereas activation of Smad2 is not dependent on TRAF6.

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Acknowledgements

We are grateful to P. ten Dijke, K. Miyazono, I. Dikic, K. Matsumoto, J. Ninomiya-Tsuji, Z.J. Chen and V.M. Dixit for providing expression vectors and reagents, and J. Inoue for his gift of wild-type and TRAF6−/− MEFs. We are grateful to U. Engström who synthesized the p-TAK1 peptide used for generation of rabbit anti-serum. We thank J. Ericsson for his valuable advice on how to perform in vitro ubiquitylation assays, and A. Moustakas and A. Morén for their advice on how to perform in vivo ubiquitylation assays. This work was supported in part by grants from the Swedish Medical Research Council, the Swedish Cancer Society, Wenner-Grenska Society and the Torsten and Ragnar Söderbergs Foundation (M.L.).

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Author notes

  1. Alessandro Sorrentino, Noopur Thakur and Susanne Grimsby: These authors contributed equally to this work.

Authors and Affiliations

  1. Ludwig Institute for Cancer Research, Rudbeck Laboratory, Uppsala University, Sweden, Dag Hammarskjöldsv. 20, 85 Uppsala, SE-751, Sweden
    Alessandro Sorrentino, Noopur Thakur, Susanne Grimsby, Anders Marcusson, Verena von Bulow, Norbert Schuster, Shouting Zhang, Carl-Henrik Heldin & Maréne Landström
  2. Department of Genetics and Pathology, Rudbeck Laboratory, Uppsala University, Sweden, Dag Hammarskjöldsv. 20, 85 Uppsala, SE-751, Sweden
    Noopur Thakur, Anders Marcusson & Maréne Landström

Authors

  1. Alessandro Sorrentino
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  2. Noopur Thakur
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  3. Susanne Grimsby
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  4. Anders Marcusson
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  5. Verena von Bulow
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  6. Norbert Schuster
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  7. Shouting Zhang
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  8. Carl-Henrik Heldin
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  9. Maréne Landström
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Contributions

A.S., N.T., S.G., A.M., V.v.B., N.S., S.Z. and M.L. performed the experiments; C.-H.H. and M.L. planned the project; A.S., N.T., C.-H.H. and M.L. prepared the manuscript.

Corresponding author

Correspondence toMaréne Landström.

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The authors declare no competing financial interests.

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Sorrentino, A., Thakur, N., Grimsby, S. et al. The type I TGF-β receptor engages TRAF6 to activate TAK1 in a receptor kinase-independent manner.Nat Cell Biol 10, 1199–1207 (2008). https://doi.org/10.1038/ncb1780

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