Predicted to be involved in protein secretion and vesicle-mediated transport. Predicted to be located in membrane. Predicted to be active in Golgi membrane. Is expressed in several structures, including adult head; anterior endoderm; embryonic/larval midgut primordium; gland; and gut section. Orthologous to several human genes including TVP23A (trans-golgi network vesicle protein 23 homolog A) and TVP23B (trans-golgi network vesicle protein 23 homolog B).