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- Title
Novel binding sites on clathrin and adaptors regulate distinct aspects of coat assembly.
- Authors
Knuehl, Christine; Chen, Chih-Ying; Manalo, Venus; Hwang, Peter K; Ota, Nobuyuki; Brodsky, Frances M
- Abstract
Clathrin-coated vesicles (CCVs) sort proteins at the plasma membrane, endosomes and trans Golgi network for multiple membrane traffic pathways. Clathrin recruitment to membranes and its self-assembly into a polyhedral coat depends on adaptor molecules, which interact with membrane-associated vesicle cargo. To determine how adaptors induce clathrin recruitment and assembly, we mapped novel interaction sites between these coat components. A site in the ankle domain of the clathrin triskelion leg was identified that binds a common site on the appendages of tetrameric [AP1 and AP2] and monomeric (GGA1) adaptors. Mutagenesis and modeling studies suggested that the clathrin-GGA1 appendage interface is nonlinear, unlike other peptide-appendage interactions, but overlaps with a sandwich domain binding site for accessory protein peptides, allowing for competitive regulation of coated vesicle formation. A novel clathrin box in the GGA1 hinge region was also identified and shown to mediate membrane recruitment of clathrin, while disruption of the clathrin-GGA1 appendage interaction did not affect recruitment. Thus, the distinct sites for clathrin-adaptor interactions perform distinct functions, revealing new aspects to regulation of CCV formation.
- Publication
Traffic (Copenhagen, Denmark), 2006, Vol 7, Issue 12, p1688
- ISSN
1398-9219
- Publication type
Journal Article
- DOI
10.1111/j.1600-0854.2006.00499.x