Publication Date:
2003-04-12
Description:
Rapid turnover of the tumor suppressor protein p53 requires the MDM2 ubiquitin ligase, and both interact with p300-CREB-binding protein transcriptional coactivator proteins. p53 is stabilized by the binding of p300 to the oncoprotein E1A, suggesting that p300 regulates p53 degradation. Purified p300 exhibited intrinsic ubiquitin ligase activity that was inhibited by E1A. In vitro, p300 with MDM2 catalyzed p53 polyubiquitination, whereas MDM2 catalyzed p53 monoubiquitination. E1A expression caused a decrease in polyubiquitinated but not monoubiquitinated p53 in cells. Thus, generation of the polyubiquitinated forms of p53 that are targeted for proteasome degradation requires the intrinsic ubiquitin ligase activities of MDM2 and p300.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Grossman, Steven R -- Deato, Maria E -- Brignone, Chrystelle -- Chan, Ho Man -- Kung, Andrew L -- Tagami, Hideaki -- Nakatani, Yoshihiro -- Livingston, David M -- CA15751/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2003 Apr 11;300(5617):342-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12690203" target="_blank"〉PubMed〈/a〉
Keywords:
Adenovirus E1A Proteins/metabolism
;
Animals
;
Catalysis
;
Cells, Cultured
;
E1A-Associated p300 Protein
;
Embryo, Mammalian
;
Fibroblasts/metabolism
;
Humans
;
Ligases/antagonists & inhibitors/metabolism
;
Mice
;
Nuclear Proteins/antagonists & inhibitors/*metabolism
;
Proto-Oncogene Proteins/metabolism
;
Proto-Oncogene Proteins c-mdm2
;
Recombinant Fusion Proteins/metabolism
;
Recombinant Proteins/metabolism
;
Trans-Activators/antagonists & inhibitors/*metabolism
;
Transfection
;
Tumor Cells, Cultured
;
Tumor Suppressor Protein p53/*metabolism
;
Ubiquitin-Protein Ligases
;
Ubiquitins/*metabolism
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
