May regulate the synthesis and function of lysosomes and of highly specialized organelles, such as melanosomes and platelet dense granules (By similarity). Acts as cargo adapter for the dynein-dynactin motor complex to mediate the transport of lysosomes from the cell periphery to the perinuclear region. Facilitates retrograde lysosomal trafficking by linking the motor complex to lysosomes, and perinuclear positioning of lysosomes is crucial for the delivery of endocytic cargos to lysosomes, for lysosome maturation and functioning (PubMed:25189619). Component of the biogenesis of lysosome-related organelles complex-2 (or BLOC2) composed of HPS3, HPS5 and HPS6. Interacts with HPS5 and HPS3. Interacts with biogenesis of lysosome-related organelles complex-1 (BLOC1). Interacts with dynein intermediate chain (By similarity). Interacts with AP-3 complex (PubMed:19010779). Interacts with DCTN1 (PubMed:25189619). Widely expressed, with lowest expression in skeletal muscle. Defects in Hps6 are the cause of Hermansky-Pudlak-like syndrome, a syndrome characterized by hypopigmented eyes and coat, melanosomes greatly reduced in number and morphologically bizarre, kidney proximal tubules secreting lysosomal enzymes into urine at greatly reduced rates, platelet dense granules deficient in critical components, such as serotonin and adenine nucleotides, leading to functionally abnormal platelets and prolonged bleeding times, and mast cell granules undergoing unregulated 'kiss-and-run' fusion at the plasma membrane.