Enables amyloid-beta binding activity. Predicted to be involved in chemical synaptic transmission and regulation of synaptic vesicle exocytosis. Predicted to act upstream of or within in utero embryonic development; locomotory behavior; and regulation of gene expression. Located in plasma membrane. Orthologous to human APBA2 (amyloid beta precursor protein binding family A member 2). [provided by Alliance of Genome Resources, Apr 2022]