Predicted to be involved in several processes, including autophagosome maturation; melanosome localization; and regulation of lysosomal lumen pH. Predicted to act upstream of or within pigmentation; platelet formation; and regulation of developmental pigmentation. Located in cytoplasmic vesicle. Orthologous to human VPS33A (VPS33A core subunit of CORVET and HOPS complexes). [provided by Alliance of Genome Resources, Apr 2022]