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MDM2 recruitment of lysine methyltransferases regulates p53 transcriptional output
Author(s) -
Chen Lihong,
Li Zhenyu,
Zwolinska Aleksandra K,
Smith Matthew A,
Cross Brittany,
Koomen John,
Yuan ZhiMin,
Jenuwein Thomas,
Marine JeanChristophe,
Wright Kenneth L,
Chen Jiandong
Publication year - 2010
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1038/emboj.2010.140
Subject(s) - mdm2 , biology , methyltransferase , histone methyltransferase , histone h3 , ezh2 , histone methylation , methylation , histone deacetylase , ubiquitin ligase , cancer research , histone , microbiology and biotechnology , gene knockdown , ubiquitin , biochemistry , dna methylation , apoptosis , gene expression , gene
MDM2 is a key regulator of the p53 tumor suppressor acting primarily as an E3 ubiquitin ligase to promote its degradation. MDM2 also inhibits p53 transcriptional activity by recruiting histone deacetylase and corepressors to p53. Here, we show that immunopurified MDM2 complexes have significant histone H3‐K9 methyltransferase activity. The histone methyltransferases SUV39H1 and EHMT1 bind specifically to MDM2 but not to its homolog MDMX. MDM2 mediates formation of p53–SUV39H1/EHMT1 complex capable of methylating H3‐K9 in vitro and on p53 target promoters in vivo . Furthermore, MDM2 promotes EHMT1‐mediated p53 methylation at K373. Knockdown of SUV39H1 and EHMT1 increases p53 activity during stress response without affecting p53 levels, whereas their overexpression inhibits p53 in an MDM2‐dependent manner. The p53 activator ARF inhibits SUV39H1 and EHMT1 binding to MDM2 and reduces MDM2‐associated methyltransferase activity. These results suggest that MDM2‐dependent recruitment of methyltransferases is a novel mechanism of p53 regulation through methylation of both p53 itself and histone H3 at target promoters.