catalytic activity:ATP + 1-phosphatidyl-1D-myo-inositol 4-phosphate = ADP + 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate.,caution:It is unsure if the enzyme has intrinsic kinase activity.,function:May act as a scaffold to localize and regulate type I PI(4)P 5-kinases to specific compartments within the cell, where they generate PI(4,5)P2 for actin nucleation, signaling and scaffold protein recruitment and conversion to PI(3,4,5)P3.,similarity:Contains 1 PI5K domain.,subcellular location:Localized to large cytoplasmic vesicular structures.,subunit:Heterodimerizes with other type I phosphatidylinositol-4-phosphate 5-kinase.,
Cytoplasm. Membrane. Localized to large cytoplasmic vesicular structures. .
Brain,
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