Schematic representation of IKKγ domains. HLX, helix; CC, coiled coil; LZ, leucine zipper; ZF, zinc finger; KBD, kinase binding domain; MOD, minimal oligomerization domain; UBAN, ubiquitin binding in ABIN and NEMO domain. The positions for site-directed mutagenesis of the IKKγ mutants used in this study are shown: L227P L230R (solid triangles), F238R D242R (open arrows), K277E (open diamond), K285R K309R (open triangles), and F312A (shaded triangle).