Predicted to be involved in intra-Golgi vesicle-mediated transport. Part of Golgi transport complex. Is expressed in several structures, including embryonic proventriculus inner layer; embryonic/larval midgut primordium; embryonic/larval salivary gland; foregut primordium; and gut section. Human ortholog(s) of this gene implicated in congenital disorder of glycosylation type IIl. Orthologous to human COG6 (component of oligomeric golgi complex 6).