The PI(5)P Lipid Kinase Substrate has been specifically optimized for use with Type II PIP kinases (e.g., PIP4K2A). The substrate consists of solubilized phosphatidylinositol 5-phosphate (PI(5)P) in an aqueous buffer, and is used in combination with our Adapta™ Universal Kinase Assay to help identify unique kinase inhibitors.