Structural and biophysical studies of the human IL-7/IL-7Ralpha complex.

Structural and biophysical studies of the human IL-7/IL-7Ralpha complex.
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DOI:
10.1016/j.str.2008.10.019
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发表时间:
2009-01-14
期刊:
Structure (London, England : 1993)
影响因子:
--
通讯作者:
Walsh ST
Walsh ST
中科院分区:
其他
文献类型:
--
作者:
McElroy CA;Dohm JA;Walsh ST

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IL-7和IL-7Rα与γc受体结合,形成一种复合体,对导致T细胞和B细胞的发育和动态平衡的几个信号级联反应至关重要。我们报道了IL-7Rα胞外结构域通过糖基化来调节其与IL-7的结合常数,这与γc家族的其他受体不同。IL-7与糖基化的IL-7Rα的结合比未糖基化的IL-7Rα紧密300倍,亲和力的增强主要归因于更快的接通率。将复合体中的IL-7与两种形式的IL-7Rα进行结构比较,发现糖基化不直接参与结合界面。IL-7Rα的SCID突变位于与IL-7的结合界面外,提示表达的突变导致IL-7Rα的蛋白质折叠缺陷。IL-7/IL-7Rα结构为研究IL-7信号通路的分子识别事件提供了第一个视角,并为设计治疗IL-7相关疾病的新疗法提供了靶点。
IL-7 and IL-7Rα bind the γc receptor forming a complex crucial to several signaling cascades leading to the development and homeostasis of T and B cells. We report the IL-7Rα ectodomain uses glycosylation to modulate its binding constants to IL-7, unlike the other receptors in the γc family. IL-7 binds glycosylated IL-7Rα 300-fold more tightly than unglycosylated IL-7Rα, and the enhanced affinity is attributed primarily to an accelerated on-rate. Structural comparison of IL-7 in complex to both forms of the IL-7Rα reveals that glycosylation does not participate directly in the binding interface. The SCID mutations of the IL-7Rα locate outside the binding interface with IL-7 suggesting that the expressed mutations cause protein folding defects in IL-7Rα. The IL-7/IL-7Rα structures provide the first view into the molecular recognition events of the IL-7 signaling cascade and provide sites to target for designing new therapeutics to treat IL-7 related diseases.
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