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RNA Modulates the Interaction Between Influenza A Virus NS1 and Human PABP1

Overview
Journal Biochemistry
Specialty Biochemistry
Date 2018 May 22
PMID 29782795
Citations 7
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Abstract

Nonstructural protein 1 (NS1) is a multifunctional protein involved in preventing host-interferon response in influenza A virus (IAV). Previous studies have indicated that NS1 also stimulates the translation of viral mRNA by binding to conserved sequences in the viral 5'-UTR. Additionally, NS1 binds to poly(A) binding protein 1 (PABP1) and eukaryotic initiation factor 4G (eIF4G). The interaction of NS1 with the viral 5'-UTR, PABP1, and eIF4G has been suggested to specifically enhance the translation of viral mRNAs. In contrast, we report that NS1 does not directly bind to sequences in the viral 5'-UTR, indicating that NS1 is not responsible for providing the specificity to stimulate viral mRNA translation. We also monitored the interaction of NS1 with PABP1 using a new, quantitative FRET assay. Our data show that NS1 binds to PABP1 with high affinity; however, the binding of double-stranded RNA (dsRNA) to NS1 weakens the binding of NS1 to PABP1. Correspondingly, the binding of PABP1 to NS1 weakens the binding of NS1 to double-stranded RNA (dsRNA). In contrast, the affinity of PABP1 for binding to poly(A) RNA is not significantly changed by NS1. We propose that the modulation of NS1·PABP1 interaction by dsRNA may be important for the viral cycle.

Citing Articles

Structural Investigations of Interactions between the Influenza a Virus NS1 and Host Cellular Proteins.

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PMID: 37896840 PMC: 10612106. DOI: 10.3390/v15102063.


Role of CIV NS1 Protein in Innate Immunity and Viral Replication.

Fu C, Zhu W, Cao N, Liu W, Lu Z, Wong Z Int J Mol Sci. 2023; 24(12).

PMID: 37373204 PMC: 10298371. DOI: 10.3390/ijms241210056.


Strategies of Influenza A Virus to Ensure the Translation of Viral mRNAs.

Li H, Yang C, Lo S Pathogens. 2022; 11(12).

PMID: 36558855 PMC: 9783940. DOI: 10.3390/pathogens11121521.


Interaction of the Influenza A Virus NS1 Protein with the 5'-m7G-mRNA·eIF4E·eIF4G1 Complex.

Cruz A, Joseph S Biochemistry. 2022; 61(14):1485-1494.

PMID: 35797022 PMC: 10164398. DOI: 10.1021/acs.biochem.2c00019.


Influenza A Virus NS1 Protein Binds as a Dimer to RNA-Free PABP1 but Not to the PABP1·Poly(A) RNA Complex.

de Rozieres C, Joseph S Biochemistry. 2020; 59(46):4439-4448.

PMID: 33172261 PMC: 8034803. DOI: 10.1021/acs.biochem.0c00666.


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