期刊
NATURE STRUCTURAL & MOLECULAR BIOLOGY
卷 21, 期 4, 页码 375-U115出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nsmb.2794
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资金
- FWO [G0C2214N]
- Hercules Foundation [AUGE-11-029]
- Ghent University
Thymic stromal lymphopoietin (TSLP), a cytokine produced by epithelial cells at barrier surfaces, is pivotal for the development of widespread chronic inflammatory disorders such as asthma and atopic dermatitis. The structure of the mouse TSLP-mediated signaling complex reveals how TSLP establishes extensive interfaces with its cognate receptor (TSLPR) and the shared interleukin 7 receptor alpha-chain (IL-7R alpha) to evoke membrane-proximal receptor-receptor contacts poised for intracellular signaling. Binding of TSLP to TSLPR is a mechanistic prerequisite for recruitment of IL-7R alpha to the high-affinity ternary complex, which we propose is coupled to a structural switch in TSLP at the crossroads of the cytokine-receptor interfaces. Functional interrogation of TSLP-receptor interfaces points to putative interaction hotspots that could be exploited for antagonist design. Finally, we derive the structural rationale for the functional duality of IL-7R alpha and establish a consensus for the geometry of ternary complexes mediated by interleukin 2 (IL-2)-family cytokines.
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