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AP3S2 is a 22-kDa protein that belongs to the adaptor complexes small subunit family. AP3S2 is a subunit of the AP-3 complex which is associated with the Golgi region as well as more peripheral structures. Adaptor protein (AP) complexes are cytosolic heterotetramers that mediate the sorting of membrane proteins in the secretory and endocytic pathways. AP-3 complex is composed of two large adaptins (AP3D1 and AP3B1 or AP3B2), a medium adaptin (AP3M1 or AP3M2) and a small adaptin (APS1 or AP3S2).