Involved in anterograde synaptic vesicle transport. Predicted to be located in trans-Golgi network. Predicted to be part of AP-3 adaptor complex. Is expressed in adrenal gland; gut; nervous system; sensory organ; and testis. Human ortholog(s) of this gene implicated in developmental and epileptic encephalopathy 48. Orthologous to human AP3B2 (adaptor related protein complex 3 subunit beta 2). [provided by Alliance of Genome Resources, Apr 2022]