Acts upstream of or within endoplasmic reticulum to Golgi vesicle-mediated transport and protein localization to endoplasmic reticulum exit site. Predicted to be located in endoplasmic reticulum and membrane. Predicted to be integral component of membrane. Predicted to be active in endoplasmic reticulum membrane. Is expressed in alimentary system; ganglia; liver lobe; telencephalon ventricular layer; and vibrissa. Orthologous to human BCAP29 (B cell receptor associated protein 29). [provided by Alliance of Genome Resources, Apr 2022]