Download MendeleyStructural basis for recruitment of the adaptor protein APS to the activated insulin receptor.
Hu, J., Liu, J., Ghirlando, R., Saltiel, A.R., Hubbard, S.R.(2003) Mol Cell 12: 1379-1389
- PubMed: 14690593
- DOI: https://doi.org/10.1016/s1097-2765(03)00487-8
- Primary Citation of Related Structures:
1RPY, 1RQQ - PubMed Abstract:
The adaptor protein APS is a substrate of the insulin receptor and couples receptor activation with phosphorylation of Cbl to facilitate glucose uptake. The interaction with the activated insulin receptor is mediated by the Src homology 2 (SH2) domain of APS. Here, we present the crystal structure of the APS SH2 domain in complex with the phosphorylated tyrosine kinase domain of the insulin receptor. The structure reveals a novel dimeric configuration of the APS SH2 domain, wherein the C-terminal half of each protomer is structurally divergent from conventional, monomeric SH2 domains. The APS SH2 dimer engages two kinase molecules, with pTyr-1158 of the kinase activation loop bound in the canonical phosphotyrosine binding pocket of the SH2 domain and a second phosphotyrosine, pTyr-1162, coordinated by two lysine residues in beta strand D. This structure provides a molecular visualization of one of the initial downstream recruitment events following insulin activation of its dimeric receptor.
Organizational Affiliation:
Skirball Institute of Biomolecular Medicine and Department of Pharmacology, New York University School of Medicine, New York, NY 10016, USA.
