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  • IL-22R, IL-10R2, and IL-22BP Binding Sites Are Topologically Juxtaposed on Adjacent and Overlapping Surfaces of IL-22
  • Add time:08/09/2019         Source:sciencedirect.com

    Interleukin (IL) 22 is a type II cytokine that is produced by immune cells and acts on nonimmune cells to regulate local tissue inflammation. As a product of the recently identified T helper 17 lineage of CD4 + effector lymphocytes, IL-22 plays a critical role in mucosal immunity as well as in dysregulated inflammation observed in autoimmune diseases. We used comprehensive mutagenesis combined with mammalian cell expression, ELISA cell-based, and structural methods to evaluate how IL-22 interacts with its cell surface receptor, IL-22R/IL-10R2, and with secreted IL-22 binding protein. This study identifies those amino acid side chains of IL-22 that are individually important for optimal binding to IL-22R, considerably expands the definition of IL-22 surface required for binding to IL-10R2, and demonstrates how IL-22 binding protein prevents IL-22R from binding to IL-22. The IL-22R and IL-10R2 binding sites are juxtaposed on adjacent IL-22 surfaces contributed mostly by helices A, D, and F and loop AB. Our results also provide a model for how IL-19, IL-20, IL-24, and IL-26 which are other IL-10-like cytokines, interact with their respective cell surface receptors.

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