UCHL3 and SENP8 (DEN1) remove the C-terminal extension of NEDD8 propeptides, exposing a C-terminal Gly residue. UCHL3 can also process ubiquitin (Wada et al. 1998). UCHL3 and SENP8 are probably functionally redundant in NEDD8 processing as deletion of either enzyme does not lead to neddylation defects (Chan et al. 2008, Kurihara et al. 2000).