Reaction catalyzed by phosphatidylinositol-4-phosphate 3-kinase (2.7.1.154)
ATP
+
=
ADP
+
ATP
+
1-phosphatidyl-1D-myo-inositol 4-phosphate
=
ADP
+
1-phosphatidyl-1D-myo-inositol 3,4-bisphosphate