Phosphatidylinositol-4-phosphate-binding protein that may play a role in the process of vesicle budding at the Golgi and anterograde transport to the plasma membrane. Homooligomer. Phosphatidylinositol 4-phosphate (PtdIns4P)-binding mediates recruitment to Golgi membranes. Belongs to the GOLPH3/VPS74 family.