Article ; Online: SnoN Stabilizes the SMAD3/SMAD4 Protein Complex.
2017 Volume 7, Page(s) 46370
Abstract: TGF-β signaling regulates cellular processes such as proliferation, differentiation and apoptosis through activation of SMAD transcription factors that are in turn modulated by members of the Ski-SnoN family. In this process, Ski has been shown to ... ...
Abstract | TGF-β signaling regulates cellular processes such as proliferation, differentiation and apoptosis through activation of SMAD transcription factors that are in turn modulated by members of the Ski-SnoN family. In this process, Ski has been shown to negatively modulate TGF-β signaling by disrupting active R-SMAD/Co-SMAD heteromers. Here, we show that the related regulator SnoN forms a stable complex with the R-SMAD (SMAD3) and the Co-SMAD (SMAD4). To rationalize this stabilization at the molecular level, we determined the crystal structure of a complex between the SAND domain of SnoN and the MH2-domain of SMAD4. This structure shows a binding mode that is compatible with simultaneous coordination of R-SMADs. Our results show that SnoN, and SMAD heteromers can form a joint structural core for the binding of other transcription modulators. The results are of fundamental importance for our understanding of the molecular mechanisms behind the modulation of TGF-β signaling. |
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MeSH term(s) | Humans ; Intracellular Signaling Peptides and Proteins/metabolism ; Models, Molecular ; Protein Binding ; Protein Conformation ; Proto-Oncogene Proteins/metabolism ; Signal Transduction/physiology ; Smad3 Protein/metabolism ; Smad4 Protein/metabolism |
Chemical Substances | Intracellular Signaling Peptides and Proteins ; Proto-Oncogene Proteins ; SKIL protein, human ; SMAD3 protein, human ; SMAD4 protein, human ; Smad3 Protein ; Smad4 Protein |
Language | English |
Publishing date | 2017-04-11 |
Publishing country | England |
Document type | Journal Article ; Research Support, Non-U.S. Gov't |
ZDB-ID | 2615211-3 |
ISSN | 2045-2322 ; 2045-2322 |
ISSN (online) | 2045-2322 |
ISSN | 2045-2322 |
DOI | 10.1038/srep46370 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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