Abstract：
:Both p53 and Mdmx are ubiquitinated and degraded by the same E3 ligase Mdm2; interestingly, however, while p53 is rapidly degraded by Mdm2, Mdmx is a stable protein in most cancer cells. Thus, the mechanism by which Mdmx is degraded by Mdm2 needs further elucidation. Here, we identified the noncoding 5S rRNA as a major component of Mdmx-associated complexes from human cells. We show that 5S rRNA acts as a natural inhibitor of Mdmx degradation by Mdm2. RNAi-mediated knockdown of endogenous 5S rRNA, while not affecting p53 levels, significantly induces Mdmx degradation and, subsequently, activates p53-dependent growth arrest. Notably, 5S rRNA binds the RING domain of Mdmx and blocks its ubiquitination by Mdm2, whereas Mdm2-mediated p53 ubiquitination remains intact. These results provide insights into the differential effects on p53 and Mdmx by Mdm2 in vivo and reveal a critical role for noncoding 5S rRNA in modulating the p53-Mdmx axis.
journal_name
Mol Celljournal_title
Molecular cellauthors
Li M,Gu Wdoi
10.1016/j.molcel.2011.08.020subject
Has Abstractpub_date
2011-09-16 00:00:00pages
1023-32issue
6eissn
1097-2765issn
1097-4164pii
S1097-2765(11)00640-Xjournal_volume
43pub_type
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