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Molecular and Cellular Biology, February 2007, p. 1056-1068, Vol. 27, No. 3
0270-7306/07/$08.00+0     doi:10.1128/MCB.01307-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Cancer-Associated Mutations in the MDM2 Zinc Finger Domain Disrupt Ribosomal Protein Interaction and Attenuate MDM2-Induced p53 Degradation{triangledown}

Mikael S. Lindström,1,2,{dagger} Aiwen Jin,1,{dagger} Chad Deisenroth,2,4 Gabrielle White Wolf,2,4 and Yanping Zhang1,2,3*

Department of Radiation Oncology,1 Lineberger Comprehensive Cancer Center,2 Department of Pharmacology,3 Curriculum in Genetics and Molecular Biology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-75124

Received 17 July 2006/ Returned for modification 20 August 2006/ Accepted 1 November 2006

The p53-inhibitory function of the oncoprotein MDM2 is regulated by a number of MDM2-binding proteins, including ARF and ribosomal proteins L5, L11, and L23, which bind the central acidic domain of MDM2 and inhibit its E3 ubiquitin ligase activity. Various human cancer-associated MDM2 alterations targeting the central acidic domain have been reported, yet the functional significance of these mutations in tumor development has remained unclear. Here, we show that cancer-associated missense mutations targeting MDM2's central zinc finger disrupt the interaction of MDM2 with L5 and L11. We found that the zinc finger mutant MDM2 is impaired in undergoing nuclear export and proteasomal degradation as well as in promoting p53 degradation, yet retains the function of suppressing p53 transcriptional activity. Unlike the wild-type MDM2, whose p53-suppressive activity can be inhibited by L11, the MDM2 zinc finger mutant escapes L11 inhibition. Hence, the MDM2 central zinc finger plays a critical role in mediating MDM2's interaction with ribosomal proteins and its ability to degrade p53, and these roles are disrupted by human cancer-associated MDM2 mutations.

* Corresponding author. Mailing address: Department of Radiation Oncology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7512. Phone: (919) 966-7713. Fax: (919) 966-7681. E-mail: ypzhang{at}med.unc.edu.

{triangledown} Published ahead of print on 20 November 2006.

{dagger} M.S.L. and A.J. contributed equally to this study.

Molecular and Cellular Biology, February 2007, p. 1056-1068, Vol. 27, No. 3
0270-7306/07/$08.00+0     doi:10.1128/MCB.01307-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



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