Required for protein transport from the ER to the Golgi complex. Homodimer. Dimerizes by parallel association of the tails, resulting in an elongated structure with two globular head domains side by side, and a long rod-like tail structure. Probably present on vesicles operational between the ER and the Golgi complex. Composed of a globular head region and a rod-like C-terminal coiled coil domain. The rodlike tail sequence is highly repetitive, composed of a heptapeptide repeat pattern characteristic of alpha-helical coiled coils. May form filamentous structures in the cell. Present with 2330 molecules/cell in log phase SD medium. Belongs to the VDP/USO1/EDE1 family.