Structural Congruency of Ligand Binding to the Insulin and Insulin/Type 1 Insulin-like Growth Factor Hybrid Receptors.Menting, J.G., Lawrence, C.F., Kong, G.K., Margetts, M.B., Ward, C.W., Lawrence, M.C.
(2015) Structure 23: 1271-1282
- PubMed: 26027733
- DOI: 10.1016/j.str.2015.04.016
- Primary Citation of Related Structures:
- PubMed Abstract:
- PROTECTIVE HINGE IN INSULIN OPENS TO ENABLE ITS RECEPTOR ENGAGEMENT
(2014) PROC.NATL.ACAD.SCI.USA 111: E3395
- How insulin engages its primary binding site on the insulin receptor
(2013) Nature 493: 241
The homodimeric insulin and type 1 insulin-like growth factor receptors (IR and IGF-1R) share a common architecture and each can bind all three ligands within the family: insulin and insulin-like growth factors I and II (IGF-I and IFG-II). The recept ...
The homodimeric insulin and type 1 insulin-like growth factor receptors (IR and IGF-1R) share a common architecture and each can bind all three ligands within the family: insulin and insulin-like growth factors I and II (IGF-I and IFG-II). The receptor monomers also assemble as heterodimers, the primary ligand-binding sites of which each comprise the first leucine-rich repeat domain (L1) of one receptor type and an α-chain C-terminal segment (αCT) of the second receptor type. We present here crystal structures of IGF-I bound to such a hybrid primary binding site and of a ligand-free version of an IR αCT peptide bound to an IR L1 plus cysteine-rich domain construct (IR310.T). These structures, refined at 3.0-Å resolution, prove congruent to respective existing structures of insulin-complexed IR310.T and the intact apo-IR ectodomain. As such, they provide key missing links in the emerging, but sparse, repertoire of structures defining the receptor family.
Structural Biology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, VIC 3052, Australia.