The AP1 adaptor complex is a heterotetrameric cargo-selection complex associated with clathrin-mediated traffic involving the Golgi apparatus and endosomes. It links membrane cargo and coat assembly at selected sites. Its role differs from that of the AP2 adaptor complex, which acts prominently at the plasma cell membrane. Adaptor identity helps determine which cargo is incorporated and where budding occurs. [ref]
Molecular Biology of the Cell, 4th edition by Bruce Alberts and others. Chapter 13, Transport from the Trans Golgi Network to Lysosomes: clathrin adaptors
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