Serine endoprotease that processes various proproteins by cleavage at paired basic amino acids, recognizing the RXXX[KR]R consensus motif. Likely functions in the constitutive secretory pathway. Inhibited by zinc and copper. Seems to be localized intracellularly to the trans Golgi network. Expressed in spleen, thymus, prostate, testis, ovary, small intestine, colon and peripheral blood leukocyte. Cysteine residues in the cytoplasmic tail are probably palmitoylated. N-glycosylated. Belongs to the peptidase S8 family.