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CUTTING EDGE |
* Department of Oral Biology, School of Dental Medicine and
Department of Microbiology and Immunology, School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, Buffalo, NY 14214; and
Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health Twinbrook II Facility, Bethesda, MD 20852
IL-17 and its receptor are founding members of a novel inflammatory cytokine family. To date, only one IL-17 receptor subunit has been identified, termed IL-17RA. All known cytokine receptors consist of a complex of multiple subunits. Although IL-17-family cytokines exist as homodimers, the configuration and stoichiometry of the IL-17R complex remain unknown. We used fluorescence resonance energy transfer (FRET) to determine whether IL-17RA subunits multimerize, and, if so, whether they are preassembled in the plasma membrane. HEK293 cells coexpressing IL-17RA fused to cyan or yellow fluorescent proteins (CFP or YFP) were used to evaluate FRET before and after IL-17A or IL-17F treatment. In the absence of ligand, IL-17RA molecules exhibited significant specific FRET efficiency, demonstrating that they exist in a multimeric, preformed receptor complex. Strikingly, treatment with IL-17A or IL-17F markedly reduced FRET efficiency, suggesting that IL-17RA subunits within the IL-17R complex undergo a conformational change upon ligand binding.
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