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- Title
Axin stimulates p53 functions by activation of HIPK2 kinase through multimeric complex formation.
- Authors
Yanning Rui; Zhen Xu; Shuyong Lin; Qinxi Li; Hongliang Rui; Wen Luo; Hai-Meng Zhou; Po-Yan Cheung; Zhenguo Wu; Zhiyun Ye; Peng Li; Jiahuai Han; Sheng-Cai Lin
- Abstract
Axin and p53 are tumor suppressors, controlling cell growth, apoptosis, and development. We show that Axin interacts with homeodomain-interacting protein kinase-2 (HIPK2), which is linked to UV-induced p53-dependent apoptosis by interacting with, and phosphorylating Ser 46 of, p53. In addition to association with p53 via HIPK2, Axin contains a separate domain that directly interacts with p53 at their physiological concentrations. Axin stimulates p53-dependent reporter transcription in 293 cells, but not in 293T, H1299, or SaOS-2 cells that are defective in p53 signaling. Axin, but not Axin?HIPK2, activates HIPK2-mediated p53 phosphorylation at Ser 46, facilitating p53-dependent transcriptional activity and apoptosis. Specific knockdown of Axin by siRNA reduced UV-induced Ser-46 phosphorylation and apoptosis. Kinase-dead HIPK2 reduced Axin-induced p53-dependent transcriptional activity, indicating that Axin stimulates p53 function through HIPK2 kinase activity. Interestingly, HIPK2?Axin that lacks its Axin-binding region acts as a dominant-positive form in p53 activation, suggesting that the Axin-binding region of HIPK2 is a putative autoinhibitory domain. These results show that Axin acts as a tumor suppressor by facilitating p53 function through integration of multiple factors.
- Publication
EMBO Journal, 2004, Vol 23, Issue 23, p4583
- ISSN
0261-4189
- Publication type
Academic Journal
- DOI
10.1038/sj.emboj.7600475