AP-3 complex subunit mu-1 is a protein that in humans is encoded by the AP3M1 gene .[ 5] [ 6]
The protein encoded by this gene is the medium subunit of AP-3, which is an adaptor-related protein complex associated with the Golgi region as well as more peripheral intracellular structures. AP-3 facilitates the budding of vesicles from the Golgi membrane and may be directly involved in protein sorting to the endosomal /lysosomal system. AP-3 is a heterotetrameric protein complex composed of two large subunits (delta and beta3 ), a medium subunit (mu3 ), and a small subunit (sigma 3 ). Mutations in one of the large subunits of AP-3 have been associated with the Hermansky-Pudlak syndrome , a genetic disorder characterized by defective lysosome-related organelles . Alternatively spliced transcript variants encoding the same protein have been observed.[ 6]
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