1. Daxx is reciprocally regulated by Mdm2 and Hausp
- Author
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Tang, Jun, Qu, Like, Pang, Mingsu, and Yang, Xiaolu
- Subjects
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GENETIC regulation , *PROTEIN analysis , *UBIQUITIN , *GENE expression , *APOPTOSIS , *GENETIC transcription , *LIGASES - Abstract
Abstract: Daxx is a multifunctional protein, regulating a wide range of important functions including apoptosis and transcription. However, the way Daxx is regulated is poorly understood. In our previous studies, we have found that Daxx forms a complex with the E3 ubiquitin ligase Mdm2 and the de-ubiquitinase Hausp. In the present work, we show that Daxx is ubiquitinated by Mdm2 in both in vitro and in vivo systems and Mdm2 reduces Daxx expression upon over-expression. We further demonstrate that Hausp critically controls the cellular level of Daxx most likely by inducing Daxx de-ubiquitination. These results reveal Mdm2 and Hausp as important regulators for Daxx functions by controlling Daxx ubiquitination and stability. [Copyright &y& Elsevier]
- Published
- 2010
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