GO:0016308

1-phosphatidylinositol-4-phosphate 5-kinase activity

Details:

Catalysis of the reaction: 1-phosphatidyl-1D-myo-inositol 4-phosphate + ATP = 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate + ADP + 2 H(+).