Component of the biogenesis of lysosome-related organelles complex-1 (BLOC-1) involved in gut granule biogenesis. Component of the biogenesis of lysosome-related organelles complex-1 (BLOC-1) composed at least of blos-1, blos-2, blos-4, dsbn-1, glo-2, mutd-1 and snpn-1. Belongs to the BLOC1S5 family.