GTPase-activating protein (GAP) for ADP ribosylation factor (ARF). Involved in protein trafficking by controlling ARF1 activity; may participate in COPI vesicle formation at the Golgi complex. Activated by binding to phosphatidic acid. Interacts with ARF1. Expressed in leaves, stems, flower buds and flowers. Plants overexpressing AGD7 show a relocation of proteins from the Golgi complex to the endoplasmic reticulum.