Interaction with Smad4 is Indispensable for Suppression of BMP Signaling by C-Ski

Overview

Journal Mol Biol Cell

Specialties Cell Biology
Molecular Biology

Date 2003 Dec 31

PMID 14699069

Citations 17

Authors

Masafumi Takeda

Masafumi Mizuide

Masako Oka

Tetsuro Watabe

Hirofumi Inoue

Hiroyuki Suzuki

Toshiro Fujita

Takeshi Imamura

Kohei Miyazono

Keiji Miyazawa

Affiliations

Soon will be listed here.

Abstract

c-Ski is a transcriptional corepressor that interacts strongly with Smad2, Smad3, and Smad4 but only weakly with Smad1 and Smad5. Through binding to Smad proteins, c-Ski suppresses signaling of transforming growth factor-beta (TGF-beta) as well as bone morphogenetic proteins (BMPs). In the present study, we found that a mutant of c-Ski, termed c-Ski (ARPG) inhibited TGF-beta/activin signaling but not BMP signaling. Selectivity was confirmed in luciferase reporter assays and by determination of cellular responses in mammalian cells (BMP-induced osteoblastic differentiation of C2C12 cells and TGF-beta-induced epithelial-to-mesenchymal transdifferentiation of NMuMG cells) and Xenopus embryos. The ARPG mutant recruited histone deacetylases 1 (HDAC1) to the Smad3-Smad4 complex but not to the Smad1/5-Smad4 complex. c-Ski (ARPG) was unable to interact with Smad4, and the selective loss of suppression of BMP signaling by c-Ski (ARPG) was attributed to the lack of Smad4 binding. We also found that c-Ski interacted with Smad3 or Smad4 without disrupting Smad3-Smad4 heteromer formation. c-Ski (ARPG) would be useful for selectively suppressing TGF-beta/activin signaling.

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