Phosphatidylinositol-4-phosphate 5-kinase
Phosphatidylinositol-4-phosphate 5-kinases (PIP5Ks, or PI4P5Ks) are a class of enzymes that phosphorylate phosphatidylinositol 4-phosphate. They perform this reaction on the fifth hydroxyl of the myo-inositol ring to form phosphatidylinositol 4,5-bisphosphate.