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A novel dimer configuration revealed by the crystal structure at 2.4 Å resolution of human interleukin-5

Abstract

INTERLEUKIN-5 (IL-5) is a lineage-specific cytokine for eosinophilpoiesis and plays an important part in diseases associ-ated with increased eosinophils, such as asthma1,2. Human IL-5 is a disulphide-linked homodimer with 115 amino-acid residues in each chain2. The crystal structure at 2.4 Å resolution reveals a novel two-domain structure, with each domain showing a striking similarity to the cytokine fold found in granulocyte macrophage3 and macrophage4 colony-stimulating factors, IL-2 (ref. 5), IL-4 (ref. 6), and human7 and porcine8 growth hormones. IL-5 is unique in that each domain requires the participation of two chains. The IL-5 structure consists of two left-handed bundles of four helices laid end to end and two short β-sheets on opposite sides of the molecule. Surprisingly, the C-terminal strand and helix of one chain complete a bundle of four helices and a β-sheet with the N-terminal three helices and one strand of the other chain. The structure of IL-5 provides a molecular basis for the design of antagonists and agonists that would delineate receptor recognition determinants critical in signal transduction. This structure determination extends the family of the cytokine bundle of four helices and emphasizes its fundamental significance and versatility in recognizing its receptor.

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Milburn, M., Hassell, A., Lambert, M. et al. A novel dimer configuration revealed by the crystal structure at 2.4 Å resolution of human interleukin-5. Nature 363, 172–176 (1993). https://doi.org/10.1038/363172a0

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