A novel mouse Smad4 mutation reduces protein stability and wild-type protein levels

A novel mouse Smad4 mutation reduces protein stability and wild-type protein levels Smad4 is a key signal transducer of the transforming growth factor-β (TGF-β) superfamily of growth factors that are critical regulators of embryonic patterning and adult tissue homeostasis. The biological activity of the TGF-β signaling is tightly controlled at multiple levels, including the abundance of SMAD4 proteins. We previously recovered a novel allele of Smad4 in a gene-based screen in N-ethyl-N-nitrosourea (ENU)-mutagenized mouse embryonic stem cells. The mutation resulted in an unstable truncated protein that is degraded through proteasomal pathways. In the heterozygous state, this allele acts in a dominant negative fashion to reduce the wild-type protein level as well as signaling output. Biochemical characterization indicated that the truncated protein is able to form a complex with the wild-type protein, thus targeting it for proteasomal degradation as well. Phenotypic analyses of the heterozygous animals provided insight into the threshold requirement of Smad4-dependent signaling in vivo. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Mammalian Genome Springer Journals

A novel mouse Smad4 mutation reduces protein stability and wild-type protein levels

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Publisher
Springer-Verlag
Copyright
Copyright © 2006 by Springer Science+Business Media, Inc.
Subject
Life Sciences; Anatomy; Zoology; Cell Biology
ISSN
0938-8990
eISSN
1432-1777
D.O.I.
10.1007/s00335-005-0074-3
Publisher site
See Article on Publisher Site

Abstract

Smad4 is a key signal transducer of the transforming growth factor-β (TGF-β) superfamily of growth factors that are critical regulators of embryonic patterning and adult tissue homeostasis. The biological activity of the TGF-β signaling is tightly controlled at multiple levels, including the abundance of SMAD4 proteins. We previously recovered a novel allele of Smad4 in a gene-based screen in N-ethyl-N-nitrosourea (ENU)-mutagenized mouse embryonic stem cells. The mutation resulted in an unstable truncated protein that is degraded through proteasomal pathways. In the heterozygous state, this allele acts in a dominant negative fashion to reduce the wild-type protein level as well as signaling output. Biochemical characterization indicated that the truncated protein is able to form a complex with the wild-type protein, thus targeting it for proteasomal degradation as well. Phenotypic analyses of the heterozygous animals provided insight into the threshold requirement of Smad4-dependent signaling in vivo.

Journal

Mammalian GenomeSpringer Journals

Published: Mar 3, 2006

References

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