The structure of the extracellular domains of human interleukin 11α receptor reveals mechanisms of cytokine engagement
Journal of Biological Chemistry(2020)
摘要
Interleukin (IL) 11 activates multiple intracellular signaling pathways by forming a complex with its cell surface ?-receptor, IL-11R?, and the ?-subunit receptor, gp130. Dysregulated IL-11 signaling has been implicated in several diseases, including some cancers and fibrosis. Mutations in IL-11R? that reduce signaling are also associated with hereditary cranial malformations. Here we present the first crystal structure of the extracellular domains of human IL-11R? and a structure of human IL-11 that reveals previously unresolved detail. Disease-associated mutations in IL-11R? are generally distal to putative ligand-binding sites. Molecular dynamics simulations showed that specific mutations destabilize IL-11R? and may have indirect effects on the cytokine-binding region. We show that IL-11 and IL-11R? form a 1:1 complex with nanomolar affinity and present a model of the complex. Our results suggest that the thermodynamic and structural mechanisms of complex formation between IL-11 and IL-11R? differ substantially from those previously reported for similar cytokines. This work reveals key determinants of the engagement of IL-11 by IL-11R? that may be exploited in the development of strategies to modulate formation of the IL-11?IL-11R? complex.
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关键词
cytokine,receptor structure-function,interleukin,signaling,structural biology,inflammation,cancer,fibrosis,gp130,IL6 family cytokine
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