Protein cappuccino homolog is a protein that in humans is encoded by the CNOgene.[5][6][7]
This intronless gene encodes a protein that may play a role in organelle biogenesis associated with melanosomes, platelet dense granules, and lysosomes. A similar protein in mouse is a component of a protein complex termed biogenesis of lysosome-related organelles complex 1 (BLOC-1), and is a model for Hermansky–Pudlak syndrome. The encoded protein may play a role in intracellular vesicular trafficking.[7]