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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Negative regulation of NF-kappaB action by Set9-mediated lysine methylation of the RelA subunit.
EMBO Journal 2009 April 23
Proper regulation of NF-kappaB activity is critical to maintain and balance the inflammatory response. Inactivation of the NF-kappaB complex relies in part on the proteasome-mediated degradation of promoter-bound NF-kappaB, but the detailed molecular mechanism initiating this process remains elusive. Here, we show that the methylation of the RelA subunit of NF-kappaB has an important function in this process. Lysine methyltransferase Set9 physically associates with RelA in vitro and in vivo in response to TNF-alpha stimulation. Mutational and mass spectrometric analyses reveal that RelA is monomethylated by Set9 at lysine residues 314 and 315 in vitro and in vivo. Methylation of RelA inhibits NF-kappaB action by inducing the proteasome-mediated degradation of promoter-associated RelA. Depletion of Set9 by siRNA or mutation of the RelA methylation sites prolongs DNA binding of NF-kappaB and enhances TNF-alpha-induced expression of NF-kappaB target genes. Together, these findings unveil a novel mechanism by which methylation of RelA dictates the turnover of NF-kappaB and controls the NF-kappaB-mediated inflammatory response.
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