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. May also play a role in intracellular vesicle trafficking. As part of a BORC-like complex may play a role in lysosomes movement and localization at the cell periphery. Associated with the cytosolic face of lysosomes, this complex may couple lysosomes to microtubule plus-end-directed kinesin motor. Component of the biogenesis of lysosome-related organelles complex 1 (BLOC-1). Belongs to the BLOC1S2 family.