Involved in endoplasmic reticulum to Golgi vesicle-mediated transport; membrane fusion; and transcytosis. Predicted to be located in several cellular components, including Golgi apparatus; fibrillar center; and perinuclear region of cytoplasm. Predicted to be active in ER to Golgi transport vesicle membrane; Golgi stack; and endoplasmic reticulum. Orthologous to human USO1 (USO1 vesicle transport factor). [provided by Alliance of Genome Resources, Apr 2022]