Predicted to enable endopeptidase activity. Involved in several processes, including apical protein localization; egg-laying behavior; and regulation of signal transduction. Located in perinuclear region of cytoplasm. Expressed in touch receptor neurons. Used to study Alzheimer's disease. Human ortholog(s) of this gene implicated in several diseases, including Alzheimer's disease 3; Alzheimer's disease 4; Pick's disease; dilated cardiomyopathy (multiple); and hidradenitis suppurativa. Is an ortholog of human PSEN1 (presenilin 1) and PSEN2 (presenilin 2).