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Journal of Virology, February 2003, p. 2747-2752, Vol. 77, No. 4
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.4.2747-2752.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Novel Gene Product of Thogoto Virus Segment 6 Codes for an Interferon Antagonist

Kathrin Hagmaier, Stephanie Jennings, Johanna Buse, Friedemann Weber, and Georg Kochs*

Abteilung Virologie, Institut für Medizinische Mikrobiologie und Hygiene, Universität Freiburg, D-79008 Freiburg, Germany

Received 19 July 2002/ Accepted 19 November 2002

Thogoto virus (THOV) is a tick-transmitted orthomyxovirus with a genome of six negative-stranded RNA segments. The sixth segment encodes two different transcripts: a spliced transcript that is translated into the matrix protein (M) and an unspliced transcript. Here, we report that the unspliced transcript encodes an elongated form of M named ML. A THOV isolate deficient in ML expression was an efficient interferon inducer, whereas ML-expressing wild-type strains were poor interferon inducers. These results were confirmed with recombinant THOVs rescued from cDNAs. Expression of ML efficiently suppressed activation of the beta interferon promoter by double-stranded RNA. These results indicate that ML is an accessory protein that functions as a potent interferon antagonist by blocking transcriptional activation of alpha/beta interferons.


* Corresponding author. Mailing address: Abteilung Virologie, Institut für Medizinische Mikrobiologie und Hygiene, Universität Freiburg, D-79008 Freiburg, Germany. Phone: 49-761-2036623. Fax: 49-761-2036562. E-mail: KOCHS{at}UKL.UNI-FREIBURG.DE.


Journal of Virology, February 2003, p. 2747-2752, Vol. 77, No. 4
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.4.2747-2752.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.




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