BLOC-1 or biogenesis of lysosome-related organelles complex 1 is a ubiquitously expressed multisubunit protein complex. BLOC-1 is required for normal biogenesis of specialized organelles of the endosomal-lysosomal system, such as melanosomes and platelet dense granules. The complex was first described in 2004.
The identified protein subunits of BLOC-1 include:
^Falcón-Pérez JM, Starcevic M, Gautam R, Dell'Angelica EC (2002). "BLOC-1, a novel complex containing the pallidin and muted proteins involved in the biogenesis of melanosomes and platelet-dense granules". J. Biol. Chem.277 (31): 28191–9. doi:10.1074/jbc.M204011200. PMID12019270.