Abstract
Smad2 and Smad4 are related tumour-suppressor proteins1,2, which, when stimulated by the growth factor TGF-β, form a complex to inhibit growth3. The effector function of Smad2 and Smad4 is located in the conserved carboxy-terminal domain (C domain) of these proteins and is inhibited by the presence of their amino-terminal domains (N domain)4,5. This inhibitory function of the N domain is shown here to involve an interaction with the C domain that prevents the association of Smad2 with Smad4. This inhibitory function is increased in tumour-derived forms of Smad2 and 4 that carry a missense mutation in a conserved N domain arginine residue. The mutant N domains have an increased affinity for their respective C domains, inhibit the Smad2–Smad4 interaction, and prevent TGFβ-induced Smad2–Smad4 association and signalling. Whereas mutations in the C domain disrupt the effector function of the Smad proteins, N-domain arginine mutations inhibit SMAD signalling through a gain of autoinhibitory function. Gain of autoinhibitory function is a new mechanism for inactivating tumour suppressors.
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Acknowledgements
We thank Y. Shi for recombinant Smad2 proteins, and I. Reynisdóttir, J. Doody and S. Lee for advice and technical assistance. G.L. thanks A. Hemmati-Brivanlou for support and advice. This work was supported by NIH Breast Spore and Cancer Center grants. D.W. is the recipient of a postdoctoral fellowship from the Human Frontier Science Program. A.H. is a research associate and J.M. an investigator of the Howard Hughes Medical Institute.
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Hata, A., Lo, R., Wotton, D. et al. Mutations increasing autoinhibition inactivate tumour suppressors Smad2 and Smad4. Nature 388, 82–87 (1997). https://doi.org/10.1038/40424
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DOI: https://doi.org/10.1038/40424
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