Acts upstream of or within endoplasmic reticulum to Golgi vesicle-mediated transport. Located in Golgi membrane and cytosol. Part of TRAPP complex. Is expressed in central nervous system; ganglia; olfactory epithelium; and thymus primordium. Orthologous to human TRAPPC3 (trafficking protein particle complex subunit 3). [provided by Alliance of Genome Resources, Apr 2022]