This entry is a short 101 peptide protein which is the smallest subunit of the gamma-secretase aspartyl protease complex that catalyses the intramembrane cleavage of a subset of type I transmembrane proteins. The other active constituents of the complex are presenilin (PS) nicastrin and anterior pharynx defective-1 (APH-1) protein. PEN-2 adopts a hairpin orientation in the membrane with its N- and C-terminal domains facing the luminal/extracellular space, and the C-terminal domain maintains PS stability within the complex [1].

1: Length and overall sequence of the PEN-2 C-terminal domain determines its function in the stabilization of presenilin fragments. Prokop S, Haass C, Steiner H; J Neurochem. 2005;94:57-62. PMID:15953349