Involved in endoplasmic reticulum to Golgi transport. Involved in a protein-transport step blocked by brefeldin A, which disrupts the Golgi apparatus and its incoming protein flux. May also be involved for mass growth or cell proliferation. Up-regulated during cold stress and following nutrient replenishment by dilution of cells fron exhausted to fresh minimal medium. Present with 15400 molecules/cell in log phase SD medium. Belongs to the AATF family.