Abstract
High-affinity receptors for granulocyte-macrophage colony-stimulating factor (GM-CSF), interleukin 3, and interleukin 5 consist of ligand-specific alpha chains (low-affinity subunits) and a common beta chain (beta c) that converts each complex to a high-affinity form. Although beta c alone has no detectable cytokine-binding activity, amino acid substitutions for Glu-21 of human GM-CSF significantly reduce high-affinity but not low-affinity binding, implying that beta c interacts directly with GM-CSF during formation of the high-affinity receptor but only in the presence of the alpha chain. A potential GM-CSF-binding determinant was identified in the second hemopoietin domain of beta c, and the role of individual residues within this region was investigated by determining the ability of mutated beta c chains to confer high-affinity binding when coexpressed with the alpha subunit of the GM-CSF receptor in COS cells. Substitutions involving Met-363, Arg-364, Tyr-365, and Glu-366 did not affect high-affinity binding. However, substitution of His-367 by lysine or glutamine abolished high-affinity binding, suggesting that this residue may form an important part of the high-affinity GM-CSF-binding determinant. Consistent with the loss of high-affinity binding, higher concentrations of human GM-CSF were required to stimulate proliferation of CTLL-2 cell lines transfected with cDNAs for GM-CSF receptor alpha chain and His-367 beta c mutant than those expressing GM-CSF receptor alpha subunit and beta c wild type.
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