Predicted to enable endopeptidase activator activity and protein-macromolecule adaptor activity. Acts upstream of or within several processes, including amyloid-beta formation; chemical synaptic transmission; and prepulse inhibition. Part of gamma-secretase complex. Is expressed in several structures, including nervous system. Human ortholog(s) of this gene implicated in coronary artery disease. Orthologous to human APH1B (aph-1 homolog B, gamma-secretase subunit). [provided by Alliance of Genome Resources, Apr 2022]