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
中科院分区:
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
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.
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