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The p53 tumor suppressor protein is a short-lived protein, which is stabilized in response to cellular stress. The ubiquitination and degradation of p53 are largely controlled by Mdm2, an oncogenic E3 ligase. Stress signals lead to p53 stabilization either by induction of covalent modifications in Mdm2 and p53, or through altered protein–protein interactions. Mdm2 also harbors a post-ubiquitination...
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