Journal
MOLECULAR BIOLOGY OF THE CELL
Volume 21, Issue 14, Pages 2500-2513Publisher
AMER SOC CELL BIOLOGY
DOI: 10.1091/mbc.E09-08-0715
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Funding
- National High-Tech Research and Development Program [2006AA02A310]
- Special Funds for Major State Basic Research of China [2006CB910802]
- Chinese National Natural Science Foundation [30621063]
- State Key Laboratory of Proteomics [SKLP-K200801]
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TANK/I-TRAF is a TRAF-binding protein that negatively regulates NF-kappa B activation. The underlying mechanism of this activity remains unclear. Here we show that TANK directly interacts with PLK1, a conserved cell cycle-regulated kinase. PLK1 inhibits NF-kappa B transcriptional activation induced by TNF-alpha, IL-1 beta, or several activators, but not by nuclear transcription factor p65. PLK1 expression reduces the DNA-binding activity of NF-kappa B induced by TNF-alpha. Moreover, endogenous activation of PLK1 reduces the TNF-induced phosphorylation of endogenous I kappa B alpha. PLK1 is bound to NEMO (IKK gamma) through TANK to form a ternary complex in vivo. We describe a new regulatory mechanism for PLK1: PLK1 negatively regulates TNF-induced IKK activation by inhibiting the ubiquitination of NEMO. These findings reveal that the scaffold protein TANK recruits PLK1 to negatively regulate NF-kappa B activation and provide direct evidence that PLK1 is required for the repression function of TANK.
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