The first three domains of the insulin receptor differ structurally from the insulin-like growth factor 1 receptor in the regions governing ligand specificity.
Lou, M., Garrett, T.P., McKern, N.M., Hoyne, P.A., Epa, V.C., Bentley, J.D., Lovrecz, G.O., Cosgrove, L.J., Frenkel, M.J., Ward, C.W.(2006) Proc Natl Acad Sci U S A 103: 12429-12434
- PubMed: 16894147 
- DOI: 10.1073/pnas.0605395103
- Primary Citation of Related Structures:  
2HR7 - PubMed Abstract: 
The insulin receptor (IR) and the type-1 insulin-like growth factor receptor (IGF1R) are homologous multidomain proteins that bind insulin and IGF with differing specificity. Here we report the crystal structure of the first three domains (L1-CR-L2) of human IR at 2 ...