DCUN1D2 Protein, Human (His)

DCUN1D2 protein plays a crucial role in the neddylation process of all cullins, facilitating the transfer of NEDD8 from N-terminally acetylated NEDD8-conjugating E2s enzymes to various cullin C-terminal domain-RBX complexes. This function is essential for regulating the activity of SCF (SKP1-CUL1-F-box protein)-type complexes. Through its DCUN1 domain, DCUN1D2 interacts with unneddylated cullins, including CUL1, CUL2, CUL3, CUL4A, CUL4B, and CUL5. The specificity of these interactions is influenced by the identity of the cullin, dictating the affinity of the interaction. DCUN1D2 may also engage with regulators or subunits of cullin-RING ligases, such as RBX1, RNF7, ELOB, and DDB1, with these interactions being mediated by cullins. Additionally, DCUN1D2 forms complexes with CAND1, inhibiting the neddylation of CUL3. Notably, the CAND1-cullin-DCNL complexes undergo neddylation only in the presence of a substrate adapter. Furthermore, DCUN1D2 interacts with the N-terminally acetylated forms of UBE2M and UBE2F, highlighting its involvement in intricate protein-protein interactions within the neddylation pathway.