Aspartic protease (PubMed:22933181, PubMed:21266539). Inhibited by pepstatin, diazoacetyl-DL-norleucine methyl ester (DAN) and nelfinavir (PubMed:22933181). Inhibited by the proteinase inhibitors lopinavir and ritonavir (PubMed:21266539). Optimum pH is 5 with RE-(EDANS)-SQNYPIVQK-(DABCYL)-R as substrate. Belongs to the DDI1 family.