Hermansky-Pudlak syndrome 1 protein (HPS1)

Part of the BLOC-3 complex, a complex that acts as a guanine exchange factor (GEF) for RAB32 and RAB38, promotes the exchange of GDP to GTP, converting them from an inactive GDP-bound form into an energetic GTP-bound form. The BLOC-3 complex plays an important role in the control of melanin production and melanosome biogenesis and boosts the membrane localization of RAB32 and RAB38 (PubMed:23084991).

.