Phosphatidylinositol-4-phosphate-binding protein that may antagonize the action of GOLPH3 which is required for the process of vesicle budding at the Golgi and anterograde transport to the plasma membrane. Homooligomer. Does not interact MYO18; differs from GOLPH3 by its inability to interact with MYO18. May interact with ARF1 (By similarity). Phosphatidylinositol 4-phosphate (PtdIns4P)-binding mediates recruitment to Golgi membranes. Expressed in a subset of tissues tested with higher expression in salivary gland, small intestine and skin (at protein level). Belongs to the GOLPH3/VPS74 family.