Siah-1 binds and regulates the function of Numb
Author(s) -
Laurent Susini,
Brent J. Passer,
Nathalie Amzallag-Elbaz,
Tamar JuvenGershon,
Sylvie Prieur,
Nicolas Privat,
Marcel Tuynder,
MarieClaude Gendron,
Alain Israël,
Robert Amson,
Moshe Oren,
Adam Telerman
Publication year - 2001
Publication title -
proceedings of the national academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.261571998
Subject(s) - numb , regulator , notch signaling pathway , microbiology and biotechnology , cell fate determination , biology , cytoplasm , transcription factor , genetics , gene , signal transduction
The Drosophila Seven in absentia (Sina) gene product originally was described as a protein that controls cell fate decisions during eye development. Its mammalian homolog, Siah-1, recently was found to be involved in p53-dependent and -independent pathways of apoptosis and G(1) arrest. We report that Siah-1 interacts directly with and promotes the degradation of the cell fate regulator Numb. Siah-1-mediated Numb degradation leads to redistribution of endogenous cell-surface Notch to the cytoplasm and nucleus and to augmented Notch-regulated transcriptional activity. These data imply that through its ability to target Numb for degradation, Siah-1 can act as a key regulator of Numb-related activities, including Notch signaling.
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