Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5533358 | Journal of Molecular Biology | 2016 | 18 Pages |
â¢Crystal structure of the FERM/SH2 domains of JAK1 with part of the intracellular domain of IFNLR1â¢Both box1 and box2 regions of IFNLR1 are shown to bind simultaneously to JAK1.â¢First example of a complete interaction network between JAK1 and IFNLR1
The crystal structure of a construct consisting of the FERM and SH2-like domains of the human Janus kinase 1 (JAK1) bound to a fragment of the intracellular domain of the interferon-λ receptor 1 (IFNLR1) has been determined at the nominal resolution of 2.1 à . In this structure, the receptor peptide forms an 85-à -long extended chain, in which both the previously identified box1 and box2 regions bind simultaneously to the FERM and SH2-like domains of JAK1. Both domains of JAK1 are generally well ordered, with regions not seen in the crystal structure limited to loops located away from the receptor-binding regions. The structure provides a much more complete and accurate picture of the interactions between JAK1 and IFNLR1 than those given in earlier reports, illuminating the molecular basis of the JAK-cytokine receptor association. A glutamate residue adjacent to the box2 region in IFNLR1 mimics the mode of binding of a phosphotyrosine in classical SH2 domains. It was shown here that a deletion of residues within the box1 region of the receptor abolishes stable interactions with JAK1, although it was previously shown that box2 alone is sufficient to stabilize a similar complex of the interferon-α receptor and TYK2.
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