Structural Activation of Pro-inflammatory Human Cytokine IL-23 by Cognate IL-23 Receptor Enables Recruitment of the Shared Receptor IL-12Rβ1

IL-23, a human cytokine under intense clinical targeting, is pivotal to cellular responses underlying widespread inflammatory and autoimmune diseases, such as psoriasis and rheumatoid arthritis. Bloch et al. determine the structure of IL-23 bound by one of its receptors, IL-23R, and reveal how IL-23R activates IL-23 for recruiting IL-12Rβ1 to the signaling assembly. Together with identifying an interaction hotspot, such findings may contribute to additional approaches for the mechanistic and therapeutic interrogation of receptor complexes mediated by IL-12 family members.

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