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首页> 外文期刊>Biochemistry >The Human Interferon Receptor: NMR-Bsed Modeling, Mapping of the IFN-#alpha#2 Binding Site, and Observed Ligand-Induced Tigtening
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The Human Interferon Receptor: NMR-Bsed Modeling, Mapping of the IFN-#alpha#2 Binding Site, and Observed Ligand-Induced Tigtening

机译:人类干扰素受体:NMR建模,干扰素-#alpha#2结合位点的映射,和观察到的配体诱导的上调。

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The human interferon recptor (IFNAR) mediates the antiviral and antiprolfierative activities of type I interferons (IFNs). This receptor is comprised of subunits IFNAR1 and IFNAR2, the latter exhibiting nanomolar affinity for IFNs. Here the extracelular domain of IFNAR2 (IFNAR2-EC), a soluble 25 Da IFN-binding polypeptide, and its complex with IFN-#alpha#2 wer studied using mutlidimensional NMR. IFNAR2-EC is comprised of two fibronectin-III (FN-III) (FN-III) dimains conne ted by a helical hinge regin. The deduced global fold was utilized to improve the alignment of IFNAR2-EC against structurally related receptors and to model its structue. A striking feature of IFNAR2-EC is the limited and localized deviations in chemical shifts exhibited upon ligand binding, observed for only 15% of its backbone ~1H and ~915)N nuclei. Analysis of these deviations maps the IFN-#alpha#2 binding site upon IFNAR2-EC to a contiguous surfac on the N-terminal domain, including the S3-S4 loop (residues 44-583), the S3-S6 loop and S6 #beta#-strand (srsidues 74-82), and the S7 #beta#-strand and the hinge region (residues 95-105). The C-terminal domain contributes only marginally to ligand binding, and no change in the ypothesized mutagenesis studies in IFN binding, and suggest adjacent residues cooperate in forming the binding surface. D_2O-exchange experiments indicate that binding of IFN-#alpha#2 induces tightening of the N-terminal domain ofIFNAR2-EC. This increase in receptor rigidity may play an improtant role in initiating the intracellular stage of the IFN signaling cascade.
机译:人类干扰素受体(IFNAR)介导I型干扰素(IFNs)的抗病毒和抗增殖活性。该受体由亚基IFNAR1和IFNAR2组成,后者对IFN表现出纳摩尔亲和力。在这里,使用多维NMR研究了IFNAR2的胞外结构域(IFNAR2-EC),可溶性25 Da IFN结合多肽及其与IFN-αα2的复合物。 IFNAR2-EC由通过螺旋铰链连接的两个纤连蛋白-III(FN-III)(FN-III)主体组成。推导的整体折叠被用于改善IFNAR2-EC与结构相关受体的比对并模拟其结构。 IFNAR2-EC的一个显着特征是配体结合后化学位移的局限性和局部性偏差,仅在15%的主链〜1H和〜915)N核中观察到。对这些偏差的分析将IFNAR2-EC上的IFN-#alpha#2结合位点映射到N末端域上的连续表面,包括S3-S4环(残基44-583),S3-S6环和S6# β#-链(残基74-82),S7#beta#-链和铰链区(残基95-105)。 C端结构域仅对配体结合有很小的贡献,而在IFN结合中所进行的诱变研究中没有任何变化,并暗示相邻的残基协同形成结合表面。 D_2O交换实验表明,IFN-#alpha#2的结合可诱导IFNAR2-EC的N端结构域变紧。受体刚性的这种提高可能会在启动IFN信号级联反应的细胞内阶段中起重要作用。

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