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Phage display technique identifies the interaction of severe acute respiratory syndrome coronavirus open reading frame 6 protein with nuclear pore complex interacting protein NPIPB3 in modulating Type I interferon antagonism.

J Microbiol Immunol Infect. 2017 Jun;50(3):277-285. Epub 2015 Jul 31
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摘要


BACKGROUND/PURPOSE:Severe acute respiratory syndrome coronavirus (SARS-CoV) proteins including ORF6 inhibit Type I interferon (IFN) signaling. METHODS:This study identified SARS-CoV ORF6-interacting proteins using the phage displayed human lung cDNA libraries, and examined the association of ORF6-host factor interaction with Type I IFN antagonism. After the fifth round of biopanning with Escherichia coli-synthesized ORF6-His tagged protein, the relative binding affinity of phage clones to ORF6 was determined using direct enzyme-linked immunosorbent assay. RESULTS:The highest affinity clone to ORF6 displayed the C-terminal domain of NPIPB3 (nuclear pore complex interacting protein family, member B3; also named as phosphatidylinositol-3-kinase-related kinase SMG-1 isoform 1 homolog). The coimmunoprecipitation assay demonstrated the direct binding of ORF6 to the C-terminal domain of NPIPB3 in vitro. Confocal imaging revealed a close colocalization of SARS-CoV ORF6 protein with NPIPB3 in human promonocytes. The dual luciferase reporter assay showed that the C-terminal domain of NPIPB3 attenuated the antagonistic activity of SARS-CoV ORF6 on IFN-β-induced ISRE (IFN stimulated response element)-responsive firefly luciferase activity. In addition, confocal imaging and Western blotting assays revealed that the increases in nuclear translocation and phosphorylation occurred in the transfected cells expressing both genes of ORF6 and NPIPB3, but not in the ORF6-expressing cells in response to IFN-β. CONCLUSION:The overexpression of NPIPB3 restored the IFN-β responses in SARS-CoV ORF6 expressing cells, indicating that the interaction of SARS CoV ORF6 and NPIPB3 reduced Type I IFN antagonism by SARS-CoV ORF6.

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