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Dynamic Modulation of Binding Affinity as a Mechanism for Regulating Interferon Signaling

机译:作为调节干扰素信号传导机制的粘合亲和力的动态调制

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How structural dynamics affects cytokine signaling is under debate. Here, we investigated the dynamics of the type I interferon (IFN) receptor, IFNAR1, and its effect on signaling upon binding IFN and IFNAR2 using a combination of structure-based mechanistic studies, in situ binding, and gene induction assays. Our study reveals that IFNAR1 flexibility modulates ligand-binding affinity, which, in turn, regulates biological signaling. We identified the hinge sites and key interactions implicated in IFNAR1 inter-subdomain (SD1-SD4) movements. We showed that the predicted cooperative movements are essential to accommodate intermolecular interactions. Engineered disulfide bridges, computationally predicted to interfere with IFNAR1 dynamics, were experimentally confirmed. Notably, introducing disulfide bonds between subdomains SD2 and SD3 modulated IFN binding and activity in accordance with the relative attenuation of cooperative movements with varying distance from the hinge center, whereas locking the SD3 SD4 interface flexibility in favor of an extended conformer increased activity. (C) 2017 Elsevier Ltd. All rights reserved.
机译:结构动力学如何影响细胞因子信令是在辩论中的争论。在这里,我们研究了I型干扰素(IFN)受体,IFNAR1的动态,以及利用基于结构的机械研究,原位结合和基因诱导测定的组合结合IFN和IFNAR2时对信号传导的影响。我们的研究表明,IFNAR1柔韧性调节配体结合亲和力,反过来调节生物信号传导。我们识别了IFNAR IFNAR INDOMAIN(SD1-SD4)运动中涉及的铰链站点和关键交互。我们表明,预测的合作运动对于适应分子间相互作用至关重要。经过实验证实,工程化的二硫化物桥梁,预计会干扰IFNAR1动态。值得注意的是,根据与铰链中心不同距离的协同运动的相对衰减引入子域SD2和SD3之间的二硫键,而锁定SD3 SD4界面的灵活性,有利于延伸的符合子增加的活动。 (c)2017 Elsevier Ltd.保留所有权利。

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