CC2-LZ is a leucine-zipper domain associated with the CC2 coiled-coil region of NF-kappa-B essential modulator, NEMO. It plays a regulatory role, along with the very C-terminal zinc-finger; it contains a ubiquitin-binding domain (UBD) and represents one region that contributes to NEMO oligomerisation. NEMO itself is an integral part of the IkappaB kinase complex and serves as a molecular switch via which the NF-kappaB signalling pathway is regulated [1].

1: DARPin-assisted crystallography of the CC2-LZ domain of NEMO reveals a coupling between dimerization and ubiquitin binding. Grubisha O, Kaminska M, Duquerroy S, Fontan E, Cordier F, Haouz A, Raynal B, Chiaravalli J, Delepierre M, Israel A, Veron M, Agou F; J Mol Biol. 2010;395:89-104. PMID:19854204