PH and SEC7 domain-containing protein 4 (PSD4)

Guanine nucleotide exchange factor for ARF6 and ARL14/ARF7. During ARL14 activation, controls the movement of MHC class II-containing vesicles along the actin cytoskeleton in dendritic cells.

Involved in membrane recycling. Interacts with different phosphatidylinositol phosphate species, including phosphatidylinositol 3,4-bisphosphate, phosphatidylinositol 3,5- bisphosphate and phosphatidylinositol 4,5-bisphosphate.