The function of APBA2 (amyloid beta precursor protein binding family A member 2, Ensembl gene identifier ENSG00000034053) is as follows. Putative function in synaptic vesicle exocytosis by binding to STXBP1, an essential component of the synaptic vesicle exocytotic machinery. May modulate processing of the amyloid-beta precursor protein (APP) and hence formation of APP-beta.