Predicted to be involved in anterograde synaptic vesicle transport and vesicle-mediated transport. Predicted to be located in membrane. Predicted to be part of AP-3 adaptor complex. Predicted to be active in intracellular membrane-bounded organelle. Orthologous to human AP3S1 (adaptor related protein complex 3 subunit sigma 1). [provided by Alliance of Genome Resources, Apr 2022]