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Front Microbiol. 2018 Sep 12;9:2192. doi: 10.3389/fmicb.2018.02192. eCollection 2018.
The Cellular DExD/H-Box RNA Helicase UAP56 Co-localizes With the Influenza A Virus NS1 Protein.
Chiba S1, Hill-Batorski L1, Neumann G1, Kawaoka Y1,2,3.
Author information
Abstract
UAP56, a member of the DExD/H-box RNA helicase family, is essential for pre-mRNA splicing and mRNA export in eukaryotic cells. In influenza A virus-infected cells, UAP56 mediates viral mRNA nuclear export, facilitates viral ribonucleoprotein complex formation through direct interaction with the viral nucleoprotein, and may indirectly affect antiviral host responses by binding to and/or facilitating the activation of the antiviral host factors MxA and PKR. Here, we demonstrate that UAP56 also co-localizes with the influenza A viral NS1 protein, which counteracts host cell innate immune responses stimulated by virus infection. The UAP56-NS1 association relies on the RNA-binding residues R38 and K41 in NS1 and may be mediated by single-stranded RNA. UAP56 association with NS1 does not affect the NS1-mediated downregulation of cellular innate immune pathways in reporter gene assays, leaving in question the exact biological role and relevance of the UAP56-NS1 association.
KEYWORDS:
UAP56; host factors; influenza A NS1; influenza A virus; nuclear localization
PMID: 30258431 PMCID: PMC6144874 DOI: 10.3389/fmicb.2018.02192
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The Cellular DExD/H-Box RNA Helicase UAP56 Co-localizes With the Influenza A Virus NS1 Protein.
Chiba S1, Hill-Batorski L1, Neumann G1, Kawaoka Y1,2,3.
Author information
Abstract
UAP56, a member of the DExD/H-box RNA helicase family, is essential for pre-mRNA splicing and mRNA export in eukaryotic cells. In influenza A virus-infected cells, UAP56 mediates viral mRNA nuclear export, facilitates viral ribonucleoprotein complex formation through direct interaction with the viral nucleoprotein, and may indirectly affect antiviral host responses by binding to and/or facilitating the activation of the antiviral host factors MxA and PKR. Here, we demonstrate that UAP56 also co-localizes with the influenza A viral NS1 protein, which counteracts host cell innate immune responses stimulated by virus infection. The UAP56-NS1 association relies on the RNA-binding residues R38 and K41 in NS1 and may be mediated by single-stranded RNA. UAP56 association with NS1 does not affect the NS1-mediated downregulation of cellular innate immune pathways in reporter gene assays, leaving in question the exact biological role and relevance of the UAP56-NS1 association.
KEYWORDS:
UAP56; host factors; influenza A NS1; influenza A virus; nuclear localization
PMID: 30258431 PMCID: PMC6144874 DOI: 10.3389/fmicb.2018.02192
Free full text