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Mono- Versus Polyubiquitination: Differential Control of p53 Fate by Mdm2
Muyang Li,Christopher L. Brooks,Foon Wu-Baer,Delin Chen,Richard Baer,Wei Gu*
Although Mdm2-mediated ubiquitination is essential for bothdegradation and nuclear export of p53, the molecular basis forthe differential effects of Mdm2 remains unknown. Here we showthat low levels of Mdm2 activity induce monoubiquitination andnuclear export of p53, whereas high levels promote p53's polyubiquitinationand nuclear degradation. A p53-ubiquitin fusion protein thatmimics monoubiquitinated p53 was found to accumulate in thecytoplasm in an Mdm2-independent manner, indicating that monoubiquitinationis critical for p53 trafficking. These results clarify the natureof ubiquitination-mediated p53 regulation and suggest that distinctmechanisms regulate p53 function in accordance with the levelsof Mdm2 activity.
Institute for Cancer Genetics and Department of Pathology, College of Physicians & Surgeons, Columbia University, 1150 St. Nicholas Avenue, New York, NY 10032, USA.
* To whom correspondence should be addressed. E-mail: wg8{at}columbia.edu
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