Predicted to enable calcium ion binding activity. Involved in glutamatergic synaptic transmission and synaptic vesicle exocytosis. Located in synapse. Is expressed in several structures, including NMJ bouton; adult head; ganglia; larval somatic muscle cell; and neuroblasts. Orthologous to human CADPS (calcium dependent secretion activator) and CADPS2 (calcium dependent secretion activator 2).