ID:PSN2_HUMAN DESCRIPTION: RecName: Full=Presenilin-2; Short=PS-2; EC=3.4.23.-; AltName: Full=AD3LP; AltName: Full=AD5; AltName: Full=E5-1; AltName: Full=STM-2; Contains: RecName: Full=Presenilin-2 NTF subunit; Contains: RecName: Full=Presenilin-2 CTF subunit; FUNCTION: Probable 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 (beta-amyloid precursor protein). Requires the other members of the gamma-secretase complex to have a protease activity. May play a role in intracellular signaling and gene expression or in linking chromatin to the nuclear membrane. May function in the cytoplasmic partitioning of proteins. SUBUNIT: Interacts with DOCK3 (By similarity). Homodimer. Component of the gamma-secretase complex, a complex composed of a presenilin homodimer (PSEN1 or PSEN2), nicastrin (NCSTN), APH1 (APH1A or APH1B) and PEN2. Such minimal complex is sufficient for secretase activity, although other components may exist. Interacts with HERPUD1, FLNA, FLNB and PARL. INTERACTION: Q14204:DYNC1H1; NbExp=3; IntAct=EBI-2010251, EBI-356015; Q9BQ95:ECSIT; NbExp=4; IntAct=EBI-2010251, EBI-712452; Q53EL6:PDCD4; NbExp=3; IntAct=EBI-2010251, EBI-935824; SUBCELLULAR LOCATION: Endoplasmic reticulum membrane; Multi-pass membrane protein. Golgi apparatus membrane; Multi-pass membrane protein. TISSUE SPECIFICITY: Isoform 1 is seen in the placenta, skeletal muscle and heart while isoform 2 is seen in the heart, brain, placenta, liver, skeletal muscle and kidney. DOMAIN: The PAL motif is required for normal active site conformation (By similarity). PTM: Heterogeneous proteolytic processing generates N-terminal and C-terminal fragments. PTM: Phosphorylated on serine residues. DISEASE: Defects in PSEN2 are the cause of Alzheimer disease type 4 (AD4) [MIM:606889]. AD is an autosomal dominant Alzheimer disease. Alzheimer disease is a neurodegenerative disorder characterized by progressive dementia, loss of cognitive abilities, and deposition of fibrillar amyloid proteins as intraneuronal neurofibrillary tangles, extracellular amyloid plaques and vascular amyloid deposits. The major constituent of these plaques is the neurotoxic amyloid-beta-APP 40-42 peptide (s), derived proteolytically from the transmembrane precursor protein APP by sequential secretase processing. The cytotoxic C- terminal fragments (CTFs) and the caspase-cleaved products such as C31 derived from APP, are also implicated in neuronal death. DISEASE: Defects in PSEN2 are the cause of cardiomyopathy dilated type 1V (CMD1V) [MIM:613697]. It is a disorder characterized by ventricular dilation and impaired systolic function, resulting in congestive heart failure and arrhythmia. Patients are at risk of premature death. SIMILARITY: Belongs to the peptidase A22A family. WEB RESOURCE: Name=Alzheimer Research Forum; Note=Presenilins mutations; URL="http://www.alzforum.org/res/com/mut/pre/default.asp"; WEB RESOURCE: Name=GeneReviews; URL="http://www.ncbi.nlm.nih.gov/sites/GeneTests/lab/gene/PSEN2";
ModBase Predicted Comparative 3D Structure on P49810
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