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