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Journal of Virology, June 2001, p. 5090-5098, Vol. 75, No. 11
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.11.5090-5098.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Regulation of mRNA Translation and Cellular Signaling by Hepatitis C Virus Nonstructural Protein NS5A

Yupeng He,1 Seng-Lai Tan,1,dagger Semih U. Tareen,2 Sangeetha Vijaysri,3 Jeffrey O. Langland,3 Bertram L. Jacobs,3,4 and Michael G. Katze1,2,*

Department of Microbiology, School of Medicine,1 and Regional Primate Research Center,2 University of Washington, Seattle, Washington 98195, and Department of Microbiology3 and Graduate Degree Program in Molecular and Cellular Biology,4 Arizona State University, Tempe, Arizona 85287

Received 8 December 2000/Accepted 2 March 2001

The NS5A nonstructural protein of hepatitis C virus (HCV) has been shown to inhibit the cellular interferon (IFN)-induced protein kinase R (PKR). PKR mediates the host IFN-induced antiviral response at least in part by inhibiting mRNA translation initiation through phosphorylation of the alpha  subunit of eukaryotic initiation factor 2 (eIF2alpha ). We thus examined the effect of NS5A inhibition of PKR on mRNA translation within the context of virus infection by using a recombinant vaccinia virus (VV)-based assay. The VV E3L protein is a potent inhibitor of PKR. Accordingly, infection of IFN-pretreated HeLa S3 cells with an E3L-deficient VV (VVDelta E3L) resulted in increased phosphorylation levels of both PKR and eIF2alpha . IFN-pretreated cells infected with VV in which the E3L locus was replaced with the NS5A gene (VVNS5A) displayed diminished phosphorylation of PKR and eIF2alpha in a transient manner. We also observed an increase in activation of p38 mitogen-activated protein kinase in IFN-pretreated cells infected with VVDelta E3L, consistent with reports that p38 lies downstream of the PKR pathway. Furthermore, these cells exhibited increased phosphorylation of the cap-binding initiation factor 4E (eIF4E), which is downstream of the p38 pathway. Importantly, these effects were reduced in cells infected with VVNS5A. NS5A was also found to inhibit activation of the p38-eIF4E pathway in epidermal growth factor-treated cells stably expressing NS5A. NS5A-induced inhibition of eIF2alpha and eIF4E phosphorylation may exert counteracting effects on mRNA translation. Indeed, IFN-pretreated cells infected with VVNS5A exhibited a partial and transient restoration of cellular and viral mRNA translation compared with IFN-pretreated cells infected with VVDelta E3L. Taken together, these results support the role of NS5A as a PKR inhibitor and suggest a potential mechanism by which HCV might maintain global mRNA translation rate during early virus infection while favoring cap-independent translation of HCV mRNA during late infection.

* Corresponding author. Mailing address: Department of Microbiology, Box 358070, University of Washington, Seattle, WA 98195. Phone: (206) 732-6135. Fax: (206) 732-6055. E-mail: honey{at}u.washington.edu.

dagger Present address: Infectious Diseases Research, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, IN 46285.

Journal of Virology, June 2001, p. 5090-5098, Vol. 75, No. 11
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.11.5090-5098.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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