Synaptojanin

Synaptojanin is a protein involved in vesicle uncoating in neurons. This is an important regulatory lipid phosphatase. It dephosphorylates the D-5 position phosphate from phosphatidylinositol (3,4,5)-trisphosphate (PIP₃) and Phosphatidylinositol (4,5)-bisphosphate(PIP₂). It belongs to family of 5-phosphatases, which are structurally unrelated to D-3 inositol phosphatases like PTEN. Other members of the family of 5'phosphoinositide phosphatases include OCRL, SHIP1, SHIP2, INPP5J, INPP5E, INPP5B, INPP5A and SKIP.