Phosphatidylinositol phosphatase PTPRQ (Ptprq)

May act by regulating the amount of phosphatidylinositol 4,5-bisphosphate (PIP2) level in the basal area of hair bundles. Can dephosphorylate a broad assortment of phosphatidylinositol phosphates, including phosphatidylinositol 3,4,5-trisphosphate and many phosphatidylinositol monophosphates and diphosphates.

Phosphate can be hydrolyzed from the D3 and D5 positions in the inositol ring. Has reduced tyrosine-protein phosphatase activitynonetheless, the relevance of these activity in vivo is unclear.