Component of a complex required to localize phosphatidylinositol 4-kinase (PI4K) to the plasma membrane. The complex acts as a regulator of phosphatidylinositol 4-phosphate (PtdIns(4)P) synthesis. In the complex, efr3a probably acts as the membrane-anchoring component. Component of a phosphatidylinositol 4-kinase (PI4K) complex. Palmitoylation anchors the protein to the plasma membrane. Palmitoylated at its N-terminus, anchoring the protein to the plasma membrane. Belongs to the EFR3 family.