The function of Ensembl gene identifier ENSG00000143801 (PSEN2, presenilin 2) is as follows. Catalytic subunit of the gamma-secretase complex, an endoprotease complex that catalyzes the intramembrane cleavage of integral membrane proteins such as Notch receptors and APP (amyloid- beta precursor protein) (PubMed:10497236, PubMed:10652302, PubMed:16752394, PubMed:27293189, PubMed:36272978). Selectively cleaves late endosomal/lysosomal localized substrates and generates the prominent pool of intracellular amyloid beta that contains longer amyloid beta (PubMed:27293189). The holoprotein functions as a calcium- leak channel that allows the passive movement of calcium from endoplasmic reticulum to cytosol and is involved in calcium homeostasis (PubMed:16959576). Is a regulator of mitochondrion-endoplasmic reticulum membrane tethering and modulates calcium ions shuttling between ER and mitochondria (PubMed:21285369). {ECO:0000269|PubMed:10497236, ECO:0000269|PubMed:10652302, ECO:0000269|PubMed:16752394, ECO:0000269|PubMed:16959576, ECO:0000269|PubMed:21285369, ECO:0000269|PubMed:27293189, ECO:0000269|PubMed:36272978}.