Induction of p100 processing by NF-kappaB-inducing kinase involves docking IkappaB kinase alpha (IKKalpha) to p100 and IKKalpha-mediated phosphorylation.
Xiao G, Fong A, Sun SC, J Biol Chem, 2004 Jul 16 - link

IKKgamma serves as a docking subunit of the IkappaB kinase (IKK) and mediates interaction of IKK with the human T-cell leukemia virus Tax protein.
Harhaj EW, Sun SC, J Biol Chem, 1999 Aug 13 - link