DCN1-like protein 1

DCUN1D1 (DCN1-like protein 1, DCNL1) is a 259-amino-acid protein that functions as a component of E3 ubiquitin ligase complexes regulating neddylation (UniProt: Q96GG9). It promotes the conjugation of NEDD8 to cullin proteins by facilitating their nuclear translocation, enhancing E2-NEDD8 recruitment, and antagonizing CAND1-mediated inhibition of cullin-RING ligase assembly. The protein localizes to the cytoplasm and nucleus, operating within the broader ubiquitin-proteasome pathway that controls protein degradation and cell cycle regulation.

DCUN1D1 participates in fundamental cellular quality control mechanisms through its role in cullin neddylation, a process essential for maintaining E3 ligase activity across diverse cellular functions. While UniProt lists no explicit disease associations for this protein, its involvement in ubiquitin signaling implicates it in processes relevant to neuronal homeostasis.

DCUN1D1 is upregulated in Alzheimer's Disease brain tissue, with a mean log2 fold-change of +0.80 relative to age-matched controls (Chaparral AD proteomics). This upregulation was detected in post-mortem human AD brain via TMT-labeled proteomics across subcellular fractions, suggesting altered neddylation-mediated protein quality control may accompany AD pathology.