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IKK2 is one of the most crucial signaling kinases for activation of the transcription factor NF-kappa B. Since many NF-kappa B activating pathways converge at the level of IKK2, we searched for interaction partners of this kinase using the C-terminal part (aa 466-756) as bait in a yeast two-hybrid system. We identified the N-terminal part (aa 1228) of the TNF-receptor associated factor TRAF1 as putative interaction partner, which was subsequently confirmed in mammalian cells by coimmunoprecipitation experiments. However, this interaction seemed weaker than the interaction between TRAF1 and TRAF2, an important activating adapter molecule of NF-kappa B signaling indicating that relative levels of IKK2, TRAF1 and TRAF2 might be important for the final biological readout. Reporter gene and kinase assays using ectopic expression of TRAF1 indicated that it can have both activating and inhibiting functions for IKK2 and NF-kappa B. Coexpression of fluorescently tagged TRAF1 and TRAF2 at different ratios implied that TRAF1 can affect clustering and presumably the activating function of TRAF2 in a dose dependent manner.

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Interaction of the TNFR-receptor associated factor TRAF1 with I-kappa B kinase 2 (IKK2, IKK-beta, IKBKB) and TRAF2 indicating a dose dependent regulatory function of TRAF1 for NF-kappa B signaling