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Receptor epitope usage by an interleukin-5 mimetic peptide
Journal article   Open access   Peer reviewed

Receptor epitope usage by an interleukin-5 mimetic peptide

Tetsuya Ishino, Cecilia Urbina, Madhushree Bhattacharya, Dominick Panarello and Irwin Chaiken
The Journal of biological chemistry, v 280(24), pp 22951-22961
17 Jun 2005
DOI: https://doi.org/10.1074/jbc.M502341200
PMID: 15826943
Featured in Collection :   UN Sustainable Development Goals @ Drexel
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https://doi.org/10.1074/jbc.M502341200View
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Abstract

Surface Plasmon Resonance Receptors, Interleukin - chemistry Humans Molecular Sequence Data Alanine - chemistry Interleukin-5 Receptor alpha Subunit Cytokines - chemistry Time Factors Base Sequence Escherichia coli - metabolism Inhibitory Concentration 50 Thioredoxins - chemistry Binding, Competitive Interleukin-5 - chemistry Protein Structure, Tertiary Amino Acid Sequence Interleukin-3 - metabolism Peptides - chemistry Interleukin-5 - metabolism Models, Molecular Recombinant Proteins - chemistry Recombinant Fusion Proteins - chemistry Plasmids - metabolism Arginine - chemistry Sequence Homology, Amino Acid DNA - chemistry Fibronectins - chemistry Biosensing Techniques Cell Line, Tumor Protein Binding Polymers - chemistry Epitopes - chemistry Kinetics Genetic Vectors Granulocyte-Macrophage Colony-Stimulating Factor - chemistry
The cyclic peptide AF17121 is a library-derived antagonist for human interleukin-5 (IL5) receptor alpha (IL5Ralpha) and inhibits IL5 activity. Our previous results have demonstrated that the sixth arginine residue of the peptide is crucial for the inhibitory effect and that several acidic residues in the N- and C-terminal regions also make a contribution, although to a lesser extent (Ruchala, P., Varadi, G., Ishino, T., Scibek, J., Bhattacharya, M., Urbina, C., Van Ryk, D., Uings, I., and Chaiken, I. (2004) Biopolymers 73, 556-568). However, the recognition mechanism of the receptor has remained unresolved. In this study, AF17121 was fused to thioredoxin by recombinant DNA techniques and examined for IL5Ralpha interaction using a surface plasmon resonance biosensor method. Kinetic analysis revealed that the dissociation rate of the peptide.receptor complex is comparable with that of the cytokine.receptor complex. The fusion peptide competed with IL5 for both biological function and interaction with IL5Ralpha, indicating that the binding sites on the receptor are shared by AF17121 and IL5. To define the epitope residues for AF17121, we defined its binding footprint on IL5Ralpha by alanine substitution of Asp(55), Asp(56), Glu(58), Lys(186), Arg(188), and Arg(297) of the receptor. Marked effects on the interaction were observed in all three fibronectin type III domains of IL5Ralpha, in particular Asp(55), Arg(188), and Arg(297) in the D1, D2, and D3 domains, respectively. This footprint represents a significant subset of that for IL5 binding. The fact that AF17121 mimics the receptor binding capability of IL5 but antagonizes biological function evokes several models for how IL5 induces activation of the multisubunit receptor system.

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Web of Science research areas
Biochemistry & Molecular Biology
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