期刊
MOLECULAR CELL
卷 7, 期 5, 页码 927-936出版社
CELL PRESS
DOI: 10.1016/S1097-2765(01)00241-6
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资金
- NCI NIH HHS [5PO1 CA73992-02] Funding Source: Medline
The adenomatous polyposis coil (APC) tumor-suppressor protein, together with Axin and GSK3 beta, forms a Wnt-regulated signaling complex that mediates phosphorylation-dependent degradation of beta -catenin by the proteasome. Siah-1, the human homolog of Drosophila seven in absentia, is a p53-inducible mediator of cell cycle arrest, tumor suppression, and apoptosis. We have now found that Siah-1 interacts with the carboxyl terminus of APC and promotes degradation of beta -catenin in mammalian cells. The ability of Siah-1 to downregulate beta -catenin signaling was also demonstrated by hypodorsalization of Xenopus embryos. Unexpectedly, degradation of beta -catenin by Siah-1 was independent of GSK3 beta -mediated phosphorylation and did not require the F box protein beta -TrCP. These results indicate that APC and Siah-1 mediate a novel beta -catenin degradation pathway linking p53 activation to cell cycle control.
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