Molecular linkage between the kinase ATM and NF-kappaB signaling in response to genotoxic stimuli.
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Wu ZH, Shi Y, Tibbetts RS, Miyamoto S
Molecular linkage between the kinase ATM and NF-kappaB signaling in response to genotoxic stimuli.
Science. 2006 Feb 24;311(5764):1141-6.
- PubMed ID
- 16497931 [ View in PubMed]
- Abstract
The transcription factor NF-kappaB modulates apoptotic responses induced by genotoxic stress. We show that NF-kappaB essential modulator (NEMO), the regulatory subunit of IkappaB kinase (IKK) (which phosphorylates the NF-kappaB inhibitor IkappaB), associates with activated ataxia telangiectasia mutated (ATM) after the induction of DNA double-strand breaks. ATM phosphorylates serine-85 of NEMO to promote its ubiquitin-dependent nuclear export. ATM is also exported in a NEMO-dependent manner to the cytoplasm, where it associates with and causes the activation of IKK in a manner dependent on another IKK regulator, a protein rich in glutamate, leucine, lysine, and serine (ELKS). Thus, regulated nuclear shuttling of NEMO links two signaling kinases, ATM and IKK, to activate NF-kappaB by genotoxic signals.