Acts as a lipid phosphatase, removing the phosphate in the D3 position of the inositol ring from phosphatidylinositol 3,4,5-trisphosphate.
Shows no phosphoinositide phosphatase activity.
Subcellular locations: Endoplasmic reticulum membrane
Subcellular locations: Endoplasmic reticulum membrane, Golgi apparatus membrane
Subcellular locations: Cytoplasm
Isoform 3 is expressed in testis, brain and stomach while isoform 4 seems to be testis-specific.