Function:Component of the adaptor complexes which link clathrin to receptors in coated vesicles. Clathrin-associated protein complexes are believed to interact with the cytoplasmic tails of membrane proteins , leading to their selection and concentration. AP50 is a subunit of the plasma membrane adaptor. The complex binds polyphosphoinositide-containing lipids. ,PTM:Phosphorylated. ,similarity:Belongs to the adaptor complexes medium subunit family. ,similarity:Contains 1 MHD (mu homology) domain. ,subcellular location:Component of the coat surrounding the cytoplasmic face of coated vesicles in the plasma membrane. ,subunit:Adaptor protein complex 2 (AP-2) is an heterotetramer composed of two large adaptins (alpha-type subunit AP2A1 or AP2A2 and beta-type subunit AP2B1) , a medium adaptin (mu-type subunit AP2M1) and a small adaptin (sigma-type subunit AP2S1) . Interacts with ATP6V1H and MEGF10. ,
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