Component of the BLOC-1 complex, a complex that is required for normal biogenesis of lysosome-related organelles (LRO), such as platelet dense granules and melanosomes. In concert with the AP-3 complex, the BLOC-1 complex is required to target membrane protein cargos into vesicles assembled at cell bodies for delivery into neurites and nerve terminals. The BLOC-1 complex, in association with SNARE proteins, is also proposed to be involved in neurite extension. May play a role in intracellular vesicle trafficking, particularly in the vesicle-docking and fusion process. Octamer composed of one copy each BLOC1S1, BLOC1S2, BLOC1S3, BLOC1S4, BLOC1S5, BLOC1S6, DTNBP1/BLOC1S7 and SNAPIN/BLOC1S8. Interacts with SNAP47 (By similarity). Homodimer. Component of the biogenesis of lysosome-related organelles complex 1 (BLOC-1) composed of BLOC1S1, BLOC1S2, BLOC1S3, BLOC1S4, BLOC1S5, BLOC1S6, DTNBP1/BLOC1S7 and SNAPIN/BLOC1S8. Interacts with BLOC1S4, BLOC1S5, DTNBP1/BLOC1S7, F-actin, SNAP25 isoform 1 and STX12. It can exist as a soluble protein as well as a peripheral membrane protein. Expressed in liver, kidney and spleen (at protein level). Ubiquitously expressed, with the highest expression levels observed in brain, heart, liver and kidney. Phosphorylated. Defects in Pldn are the cause of the pallid (pa) phenotype that is characterized by an altered formation or function of intracellular storage granules in melanocytes, platelets, and lysosomes in kidney. Pallid mice have a prolonged bleeding time owing to the inability of immature platelet dense granules to accumulate normal amounts of ATP, ADP, and serotonin. Pa animals also suffer from pigment dilution, kidney lysosomal enzyme elevation and serum alpha1-antitrypsin activity deficiency. Finally, pallid mice exhibit defects in otolith formation that lead to balance abnormalities. May be due to a competing acceptor splice site. May be due to exon 2 skipping. Belongs to the BLOC1S6 family.