The transcription factor NF-kappa B coordinates the activation of numerous genes in response to pathogens and pro-inflammatory cytokines, and is, therefore, vital in the development of acute and chronic inflammatory diseases(1-6). NF-kappa B is activated by phsophorylation of its inhibitory subunit, I kappa B-alpha (ref. 7), on serine residues 32 and 36 by cytokine-activated I kappa B kinases (IKKs); this phosphorylation precedes rapid degradation of I kappa B8-11. IKK-alpha and IKK-beta isozymes are found in large complexes of relative molecular mass 700,000-900,000 (M-r 70K-90K), but little is known about other components that organize and regulate these complexes(12-17). IKK-alpha was independently discovered as a NF-kappa B-inducing kinase(18) (NIK)-associated protein in a yeast two-hybrid screen(19), and IKK-beta was also identified by homology screening(20). It is, however, unknown whether NIK is part of the IKK complex. Here we isolate large, interleukin-1-inducible IKK complexes that contain NIK, IKK-alpha, IKK-beta, I kappa B-alpha, NF-kappa B/RelA and a protein of M-r 150K. This latter component is a new protein, termed IKK-complex-associated protein (IKAP), which can bind NIK and IKKs and assemble them into an active kinase complex. We show that IKAP is a scaffold protein and a regulator for three different kinases involved in pro-inflammatory cytokine signalling.