Phosphatidylinositol 4-phosphate
Phosphatidylinositol-4-phosphate (PtdIns4"P", PI-4-P, PI4P, or PIP) is a precursor of phosphatidylinositol (4,5)-bisphosphate. PtdIns4"P" is prevalent in the membrane of the Golgi apparatus. In the Golgi apparatus, PtdIns4"P" binds to the GTP-binding protein ARF and to effector proteins, including four-phosphate-adaptor protein 1 and 2 (PLEKHA3 and PLEKHA8). This three molecule complex recruits proteins that need to be carried to the cell membrane. There is now evidence that PI-4-P is capable of deforming lipid systems into tightly curved assemblies, this is consistent with similar behaviour observed in phosphatidylinositol.