期刊
MOLECULAR CELL
卷 40, 期 1, 页码 75-86出版社
CELL PRESS
DOI: 10.1016/j.molcel.2010.09.010
关键词
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资金
- National Institutes of Health (HIH) [R01CA77474, R01GM083681]
- UTHSC
- Leukemia Research Foundation
- Agency for Science Technology and Research (A*Star), Singapore
Activation of the transcription factor NF-kappa B by multiple genotoxic stimuli modulates cancer cell survival. This response is mediated by a conserved pathway involving the nuclear ATM kinase and cytoplasmic I kappa B kinase (IKK); however, the molecular link between them remains incompletely understood. Here we show that ATM activates the IKK kinase TAK1 in a manner dependent on IKK gamma/NEMO and ELKS (a protein rich in glutamate, leucine, lysine, and serine). K63-linked polyubiquitination of ELKS, dependent on the ubiquitin ligase XIAP and the conjugating enzyme UBC13, allows ELKS association with TAK1 via its ubiquitin-binding subunits TAB2/3. Although NEMO mutants defective in ubiquitin binding permit ATM-dependent TAK1 activation, they block NEMO association with ELKS and IKK activation. Thus, ATM- and NEMO-dependent ubiquitination of ELKS leads to the ubiquitin-dependent assembly of TAK1/TAB2/3 and NEMO/IKK complexes, resulting in IKK and NF-kappa B activation following genotoxic stimuli.
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