Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 281, Issue 39, Pages 28575-28583Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M513311200
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The Mdm2 protein is the major regulator of the tumor suppressor protein p53. We show that the p53 protein associates both with the N-terminal and with the central domain of Mdm2. The central p53-binding site of Mdm2 encompasses amino acids 235-300. Binding of p53 to the central domain is significantly enhanced after phosphorylation of the central domain of Mdm2. The N-terminal and central domains of Mdm2 act synergistically in binding to p53. p53 mutants that have mutations in the tetramerization domain and that fail to oligomerize do not show such an enhancement of binding in the presence of the other binding site.
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