Component of the biogenesis of lysosome-related organelles complex-1 (BLOC-1) involved in pigment granule biogenesis (PubMed:20015953). May participate in the coupling of lysosomes to microtubule plus-end-directed kinesin motor (By similarity). Component of the biogenesis of lysosome-related organelles complex-1 (BLOC-1) composed of Blos1, Blos2, Blos3, Blos4, Dysb, Muted, Pldn and Snapin. Interacts with Blos2 and Dysb. Belongs to the SNAPIN family.