Required for normal morphology of late endosomes and/or lysosomes in neurons (By similarity). Binds phosphatidylinositol 3,5- bisphosphate (PtdIns(3,5)P2). {ECO:0000250, ECO:0000269|PubMed:19651769}. This is the function of Ensembl gene identifier ENSG00000146352 (CLVS2, clavesin 2).