This domain binds to cullins and to Rbx-1, components of an E3 ubiquitin ligase complex for neddylation [1-3]. Neddylation is the process by which the C-terminal glycine of the ubiquitin-like protein Nedd8 is covalently linked to lysine residues in a protein through an isopeptide bond. The structure of this domain is composed entirely of alpha helices [1,2].

1: Structural basis for the function of DCN-1 in protein Neddylation. Yang X, Zhou J, Sun L, Wei Z, Gao J, Gong W, Xu RM, Rao Z, Liu Y; J Biol Chem. 2007;282:24490-24494. PMID:17597076

2: Dcn1 functions as a scaffold-type E3 ligase for cullin neddylation. Kurz T, Chou YC, Willems AR, Meyer-Schaller N, Hecht ML, Tyers M, Peter M, Sicheri F; Mol Cell. 2008;29:23-35. PMID:18206966

3: SCCRO (DCUN1D1) is an essential component of the E3 complex for neddylation. Kim AY, Bommelje CC, Lee BE, Yonekawa Y, Choi L, Morris LG, Huang G, Kaufman A, Ryan RJ, Hao B, Ramanathan Y, Singh B; J Biol Chem. 2008;283:33211-33220. PMID:18826954