Human IFIT3 Modulates IFIT1 RNA Binding Specificity and Protein Stability.

Human IFIT3 Modulates IFIT1 RNA Binding Specificity and Protein Stability.
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DOI:
10.1016/j.immuni.2018.01.014
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发表时间:
2018-03-20
期刊:
影响因子:
32.4
通讯作者:
Amarasinghe GK
Amarasinghe GK
中科院分区:
医学1区
文献类型:
--
作者:
Johnson B;VanBlargan LA;Xu W;White JP;Shan C;Shi PY;Zhang R;Adhikari J;Gross ML;Leung DW;Diamond MS;Amarasinghe GK

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干扰素诱导的三肽重复序列蛋白(IFIT)通过识别病毒RNA来抑制病毒感染,但其调控机制尚不清楚。我们报告的晶体结构的帽0(m7 GpppN)-RNA结合的人IFIT 1在复杂的C-末端结构域的人IFIT 3。结构、生物化学和遗传学研究表明,IFIT 3与IFIT 1结合具有双重调节功能:(a)延长IFIT 1的半衰期,从而增加其在细胞中的稳态水平;(B)变构调节IFIT 1 RNA结合通道,从而增强识别cap 0而非cap 1(m7 GpppNm)或5′-ppp RNA的特异性。小鼠Ifit 3缺乏这个关键的C-末端结构域,并且不结合小鼠Ifit 1。IFIT 3与IFIT 1的相互作用对于限制RNA帽结构中缺乏2′-O甲基化的病毒的感染是重要的。我们的实验建立了IFIT 1直系同源物调控的差异,并确定了调节人IFIT蛋白活性的靶点。
Interferon-induced proteins with tetratricopeptide repeats (IFIT) inhibit infection of many viruses by recognizing their RNA, but the mechanisms regulating their remain unclear. We report a crystal structure of cap 0 (m7GpppN)-RNA-bound to human IFIT1 in complex with the C-terminal domain of human IFIT3. Structural, biochemical, and genetic studies suggest that IFIT3 binding to IFIT1 has dual regulatory functions: (a) extending the half-life of IFIT1, which increases its steady-state levels in cells and (b) allosterically regulating the IFIT1 RNA-binding channel, which enhances the specificity of recognition for cap 0 but not cap 1 (m7GpppNm) or 5′-ppp RNA. Mouse Ifit3 lacks this key C-terminal domain and does not bind mouse Ifit1. The IFIT3 interaction with IFIT1 was important for restricting infection of viruses lacking 2′-O methylation in their RNA cap structures. Our experiments establish differences in regulation of IFIT1 orthologs and define targets for modulating the activity of human IFIT proteins.
开发具有针对西尼罗河病毒的治疗潜力的人源化单克隆抗体。
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