SENP8 (SUMO peptidase family member, NEDD8 specific) is a deNEDDylase enzyme that plays a critical role in regulating the NEDD8 conjugation pathway by removing NEDD8 modifications from target proteins 1. SENP8 demonstrates exquisite specificity for NEDD8 over ubiquitin, with substrate recognition primarily determined by residue differences at positions 51 and 72 2. The enzyme prevents aberrant neddylation of NEDD8 pathway components, including auto-neddylation of the E2 enzyme Ubc12, thereby maintaining proper cullin-RING ligase (CRL) function and proteostasis 1. SENP8 localizes predominantly to the cytoplasm in human cell lines, with some nuclear presence in certain contexts 3. Functionally, SENP8 serves as a proximal regulator of cullin neddylation, controlling inflammatory responses through NF-κB and HIF-1α pathways in endothelial cells 4. In cancer contexts, SENP8 mediates SHP2 deneddylation in response to CD47/SIRPα signaling, promoting tumor immunosuppression 5. Loss of SENP8 function leads to accumulation of CRL substrates, defective cell cycle progression, and can confer resistance to certain therapeutic agents by limiting CRL4 activity 16. The enzyme's activity can be downregulated by viral proteins like adenovirus E4orf6, facilitating viral-mediated degradation of host restriction factors 7.