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The interaction of soluble forms of the human cation-independent insulin-like growth factor-II/mannose 6-phosphate receptor (IGF-IIR) with IGFs and mannosylated ligands was analyzed in real time. IGF-IIR proteins containing domains 1-15, 10-13, 11-13, or 11-12 were combined with rat CD4 domains 3 and 4. Following transient expression in 293T cells, secreted protein was immobilized onto biosensor chips. beta-Glucuronidase and latent transforming growth factor-beta1 bound only to domains 1-15. IGF-II bound to all constructs except a control, which contained a point mutation in domain 11. The affinity of domains 1-15, 10-13, 11-13, and 11-12 to IGF-II were 14, 120, 100, and 450 nm, respectively. Our data suggest that domain 13 acts as an enhancer of IGF-II affinity by slowing the rate of dissociation, but additional enhancement by domains other than 10-13 also occurs. As the receptor functions to transport ligands from either the trans-Golgi network or extracellular space to the endosomes, the interaction of IGF-IIR extracellular domains with IGF-II was analyzed over a pH range of 5.0-7.4. The constructs behaved differently in response to pH and in recovery after low pH exposure, suggesting that pH stability of the extracellular domains depends on domains other than 10-13.

Original publication

DOI

10.1074/jbc.M100700200

Type

Journal article

Journal

J Biol Chem

Publication Date

29/06/2001

Volume

276

Pages

23986 - 23991

Keywords

Animals, Biotinylation, Cell Line, Hydrogen-Ion Concentration, Insulin-Like Growth Factor II, Kinetics, Mannose, Protein Binding, Protein Structure, Tertiary, Receptor, IGF Type 2, Recombinant Fusion Proteins, Surface Plasmon Resonance