Component of the biogenesis of lysosome-related organelles complex-1 (BLOC-1), a complex that mediates the vacuolar degradative transport via the intracellular vesicle trafficking from the endosome to the vacuole. Component of the biogenesis of lysosome-related organelles complex-1 (BLOC-1) (By similarity). Interacts with BLOS1 and SNX1. Belongs to the BLOC1S2 family. The predicted gene has been split into 2 genes: At5g49550 and At5g49555.