Required for normal morphology of late endosomes and/or lysosomes in neurons (By similarity). Binds phosphatidylinositol 3,5-bisphosphate (PtdIns(3,5)P2).
Subcellular locations: Golgi apparatus, Trans-Golgi network membrane, Cytoplasmic vesicle, Clathrin-coated vesicle, Early endosome membrane