NF-κB activation by a signaling complex containing TRAF2, TANK and TBK1, a novel IKK-related kinase

Joel L. Pomerantz, David Baltimore

Research output: Contribution to journalArticlepeer-review

Abstract

The activation of NF-κB by receptors in the tumor necrosis factor (TNF) receptor and Toll/interleukin-1 (IL-1) receptor families requires the TRAF family of adaptor proteins. Receptor oligomerization causes the recruitment of TRAFs to the receptor complex, followed by the activation of a kinase cascade that results in the phosphorylation of IκB. TANK is a TRAF-binding protein that can inhibit the binding of TRAFs to receptor tails and can also inhibit NF-κB activation by these receptors. However, TANK also displays the ability to stimulate TRAF-mediated NF-κB activation. In this report, we investigate the mechanism of the stimulatory activity of TANK. We find that TANK interacts with TBK1 (TANK-binding kinase 1), a novel IKK-related kinase that can activate NF-κB in a kinase-dependent manner. TBK1, TANK and TRAF2 can form a ternary complex, and complex formation appears to be required for TBK1 activity. Kinase-inactive TBK1 inhibits TANK-mediated NF-κB activation but does not block the activation mediated by TNF-α, IL-1 or CD40. The TBK1-TANK-TRAF2 signaling complex functions upstream of NIK and the IKK complex and represents an alternative to the receptor signaling complex for TRAF-mediated activation of NF-κB.

Original languageEnglish (US)
Pages (from-to)6694-6704
Number of pages11
JournalEMBO Journal
Volume18
Issue number23
StatePublished - Dec 1 1999
Externally publishedYes

Keywords

  • IKK
  • NF-κB
  • TANK
  • TBK1
  • TRAF2

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)

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