Contributes to the neddylation of all cullins by transferring NEDD8 from N-terminally acetylated NEDD8-conjugating E2s enzyme to different cullin C-terminal domain-RBX complexes which is necessary for the activation of cullin-RING E3 ubiquitin ligases (CRLs) (PubMed:19617556, PubMed:23201271, PubMed:26906416). May play a role in DNA damage response and may participate in cell proliferation and anchorage-independent cell growth (PubMed:23098533, PubMed:24192928). {ECO:0000269|PubMed:19617556, ECO:0000269|PubMed:23098533, ECO:0000269|PubMed:23201271, ECO:0000269|PubMed:24192928, ECO:0000269|PubMed:26906416}. This is the function of DCUN1D5 (defective in cullin neddylation 1 domain containing 5, ENSG00000137692).