Abstract
The clathrin-associated adaptor protein (AP) complexes drive the polymerization of clathrin in coated pits to form coated vesicles. It has previously been shown that the carboxyl-terminal hinge/ear domain of the beta 2 chain contains a binding site for clathrin and that removal of this domain from APs or from isolated beta 2 chains abrogates their ability to form clathrin coats in vitro. We show here that the hinge/ear domain is necessary for efficient incorporation of AP complexes into coated pits and coated vesicles in cells, a result that is consistent with the view that the beta chains indeed provide an important interaction between the AP complexes and clathrin.
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