Background: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, plays a central role in bridging PI4KA to EFR3B and FAM126A, via direct interactions(PubMed:26571211).