phosphatidylinositol-3,4-bisphosphate 3-phosphatase activity
phosphatidylinositol-3,4-bisphosphate 3-phosphatase activity
Catalysis of the reaction: 1-phosphatidyl-1D-myo-inositol 3,4-bisphosphate + H2O = 1-phosphatidyl-1D-myo-inositol 4-phosphate + phosphate.