Report

CARPs enhance p53 turnover by degrading 14-3-3σ and stabilizing MDM2

Volume 7, Issue 5   March 1, 2008
Pages 670 - 682
http://dx.doi.org/10.4161/cc.7.5.5701
Authors: Wensheng Yang, David T. Dicker, Jiandong Chen and Wafik S. El-Deiry

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Abstract:
CARP1 and CARP2 proteins (CARPs) are E3 ligases that target p53 as well as phospho-p53 for degradation. Because MDM2 is a critical regulator of p53 turnover, we investigated and found that CARPs associate with MDM2. We provide evidence that CARPs stabilize MDM2 by inhibiting MDM2 self-ubiquitination. CARPs together with MDM2 enhance p53 degradation, thereby inhibiting p53-mediated cell death. CARP protein levels correlate with MDM2 levels including under hypoxia where both are reduced. CARP2 was found to target 14-3-3σ for degradation, leading to MDM2 stabilization. MDMX, a homolog of MDM2, is not absolutely required for MDM2 stabilization by CARPs, although overexpression of CARP2 enhances MDM2/MDMX interaction. Taken together, our study identifies novel mechanisms by which CARP proteins regulate the p53 signaling pathway.

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