May be involved in regulating membrane trafficking in the endosomal pathway. Overexpression induces endosome aggregation. Required to target TOM1 to endosomes (By similarity). Interacts with the C-terminus of TOM1. Does not interact with TOM1L1 or TOM1L2 (By similarity). Localized to early endosomes. Membrane-associated, probably via its association with phosphatidylinositol 3-phosphate (PI3P) (By similarity). The FYVE-type zinc finger is necessary and sufficient for its localization into early endosomes and mediates the association with PI3P.