Thiol protease that recognizes and hydrolyzes a peptide bond at the C-terminal glycine of either ubiquitin or NEDD8 (PubMed:17371404, PubMed:31658303, PubMed:20042598). Essential for parasite blood stage survival (PubMed:20042598). Thiol-dependent hydrolysis of ester, thioester, amide, peptide and isopeptide bonds formed by the C-terminal Gly of ubiquitin (a 76-residue protein attached to proteins as an intracellular targeting signal). kcat is 3.2 sec(-1) with ubiquitin-AMC as substrate. Expressed during the parasite blood stage, in schizonts (at protein level). Belongs to the peptidase C12 family.