Presenilin 1 (PS1) and Presenilin 2 (PS2) are transmembrane proteins which belong to Presenilin family, and their mutations are associated with early onset familial Alzheimer's disease. Presenilins facilitate gamma-secretase cleavage of the beta-amyloid precursor protein and the intramembraneous cleavage of Notch1 (1). Phosphorylation of the PS2 C-terminal fragments at serine residues 327 and 330, located immediately adjacent to the caspase recognition sites, inhibits caspase-mediated cleavage of PS2 and can regulate apoptotic cleavage. PS2 is cleaved by caspases during apoptosis between aspartate 329 and serine 330 (2).
Delta-Notch Signaling Pathway
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