期刊
MOLECULAR CELL
卷 40, 期 4, 页码 521-532出版社
CELL PRESS
DOI: 10.1016/j.molcel.2010.10.029
关键词
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资金
- Ludwig Institute for Cancer Research
- VINNOVA
- Swedish Research Council [K2007-66X-14936-04-3]
The versatile cytokine transforming growth factor beta (TGF-beta) regulates cellular growth, differentiation, and migration during embryonic development and adult tissue homeostasis. Activation of TGF-beta receptors leads to phosphorylation of Smad2 and Smad3, which oligomerize with Smad4 and accumulate in the nucleus where they recognize gene regulatory regions and orchestrate transcription. Termination of Smad-activated transcription involves Smad dephosphorylation, nuclear export, or ubiquitin-mediated degradation. In an unbiased proteomic screen, we identified poly(ADP-ribose) polymerase-1 (PARP-1) as a Smad-interacting partner. PARP-1 dissociates Smad complexes from DNA by ADP-ribosylating Smad3 and Smad4, which attenuates Smad-specific gene responses and TGF-beta-induced epithelial-mesenchymal transition. Thus, our results identify ADP-ribosylation of Smad proteins by PARP-1 as a key step in controlling the strength and duration of Smad-mediated transcription.
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