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Journal of Virology, November 2002, p. 11476-11483, Vol. 76, No. 22
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.22.11476-11483.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Nipah Virus V Protein Evades Alpha and Gamma Interferons by Preventing STAT1 and STAT2 Activation and Nuclear Accumulation

Jason J. Rodriguez, Jean-Patrick Parisien, and Curt M. Horvath*

Immunobiology Center, Mount Sinai School of Medicine, New York, New York 10029

Received 3 May 2002/ Accepted 26 July 2002

Characterization of recent outbreaks of fatal encephalitis in southeast Asia identified the causative agent to be a previously unrecognized enveloped negative-strand RNA virus of the Paramyxoviridae family, Nipah virus. One feature linking Nipah virus to this family is a conserved cysteine-rich domain that is the hallmark of paramyxovirus V proteins. The V proteins of other paramyxovirus species have been linked with evasion of host cell interferon (IFN) signal transduction and subsequent antiviral responses by inducing proteasomal degradation of the IFN-responsive transcription factors, STAT1 or STAT2. Here we demonstrate that Nipah virus V protein escapes IFN by a distinct mechanism involving direct inhibition of STAT protein function. Nipah virus V protein differs from other paramyxovirus V proteins in its subcellular distribution but not in its ability to inhibit cellular IFN responses. Nipah virus V protein does not induce STAT degradation but instead inhibits IFN responses by forming high-molecular-weight complexes with both STAT1 and STAT2. We demonstrate that Nipah virus V protein accumulates in the cytoplasm by a Crm1-dependent mechanism, alters the STAT protein subcellular distribution in the steady state, and prevents IFN-stimulated STAT redistribution. Consistent with the formation of complexes, STAT protein tyrosine phosphorylation is inhibited in cells expressing the Nipah virus V protein. As a result, Nipah virus V protein efficiently prevents STAT1 and STAT2 nuclear translocation in response to IFN, inhibiting cellular responses to both IFN-{alpha} and IFN-{gamma}.

* Corresponding author. Mailing address: Immunobiology Center, Mount Sinai School of Medicine, One Gustave L. Levy Pl., Box 1630, New York, NY 10029. Phone: (212) 659-9406. Fax: (212) 849-2525. E-mail: curt.horvath{at}mssm.edu.

Journal of Virology, November 2002, p. 11476-11483, Vol. 76, No. 22
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.22.11476-11483.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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