PMID- 10380931 OWN - NLM STAT- MEDLINE DCOM- 19990722 LR - 20190705 IS - 0092-8674 (Print) IS - 0092-8674 (Linking) VI - 97 IP - 6 DP - 1999 Jun 11 TI - A structural explanation for the binding of multiple ligands by the alpha-adaptin appendage domain. PG - 805-15 AB - The alpha subunit of the endocytotic AP2 adaptor complex contains a 30 kDa "appendage" domain, which is joined to the rest of the protein via a flexible linker. The 1.9 A resolution crystal structure of this domain reveals a single binding site for its ligands, which include amphiphysin, Eps15, and epsin. This domain when overexpressed in COS7 fibroblasts is shown to inhibit transferrin uptake, whereas mutants in which interactions with its binding partners are abolished do not. DPF/W motifs present in appendage domain-binding partners are shown to play a crucial role in their interactions with the domain. A single site for binding multiple ligands would allow for temporal and spatial regulation in the recruitment of components of the endocytic machinery. FAU - Owen, D J AU - Owen DJ AD - MRC Laboratory of Molecular Biology, Cambridge, United Kingdom. FAU - Vallis, Y AU - Vallis Y FAU - Noble, M E AU - Noble ME FAU - Hunter, J B AU - Hunter JB FAU - Dafforn, T R AU - Dafforn TR FAU - Evans, P R AU - Evans PR FAU - McMahon, H T AU - McMahon HT LA - eng SI - PDB/1B9K PT - Journal Article PL - United States TA - Cell JT - Cell JID - 0413066 RN - 0 (Adaptor Protein Complex 2) RN - 0 (Adaptor Protein Complex alpha Subunits) RN - 0 (Adaptor Proteins, Vesicular Transport) RN - 0 (Ligands) RN - 0 (Membrane Proteins) SB - IM MH - Adaptor Protein Complex 2 MH - Adaptor Protein Complex alpha Subunits MH - Adaptor Proteins, Vesicular Transport MH - Amino Acid Sequence MH - Animals MH - Binding Sites MH - COS Cells MH - Crystallography, X-Ray MH - Endocytosis MH - Ligands MH - Membrane Proteins/*chemistry/genetics/metabolism MH - Molecular Sequence Data MH - Protein Conformation EDAT- 1999/06/25 00:00 MHDA- 1999/06/25 00:01 CRDT- 1999/06/25 00:00 PHST- 1999/06/25 00:00 [pubmed] PHST- 1999/06/25 00:01 [medline] PHST- 1999/06/25 00:00 [entrez] AID - S0092-8674(00)80791-6 [pii] AID - 10.1016/s0092-8674(00)80791-6 [doi] PST - ppublish SO - Cell. 1999 Jun 11;97(6):805-15. doi: 10.1016/s0092-8674(00)80791-6.