Tula and Puumala hantavirus NSs ORFs are functional and the products inhibit activation of the interferon-beta promoter

KM Jääskeläinen, KM Kaukinen, ES Minskaya, A Plyusnina, O Vapalahti, Richard Michael Elliott, F Weber, A Vaheri, A Plyusnin

Research output: Contribution to journalArticlepeer-review

Abstract

The S RNA genome segment of hantaviruses carried by Arvicolinae and Sigmodontinae rodents encodes the nucleocapsid (N) protein and has an overlapping (+1) open reading frame (ORF) for a putative nonstructural protein (NSs). The aim of this study was to determine whether the ORF is functional. A protein corresponding to the predicted size of Tula virus (TULV) NSs was detected using coupled in vitro transcription and translation from a cloned S segment cDNA, and a protein corresponding to the predicted size of Puumala virus (PUUV) NSs was detected in infected cells by Western blotting with an anti-peptide serum. The activities of the interferon beta (IFN-beta) promoter, and nuclear factor kappa B (NF-kappa beta)- and interferon regulatory factor-3 (IRF-3) responsive promoters, were inhibited in COS-7 cells transiently expressing TULV or PUUV NSs. Also IFN-beta mRNA levels in IFN-competent MRC5 cells either infected with TULV or transiently expressing NSs were decreased. These data demonstrate that Tula and Puumala hantaviruses have a functional NSs ORE The findings may explain why the NSs ORF has been preserved in the genome of most hantaviruses during their long evolution and why hantavirus-infected cells secrete relatively low levels of lFNs.

Original languageEnglish
Pages (from-to)1527-1536
Number of pages10
JournalJournal of Medical Virology
Volume79
Issue number10
DOIs
Publication statusPublished - Oct 2007

Keywords

  • hantavirus
  • TULV
  • PUUV
  • NSs ORF
  • innate immunity
  • IFN
  • NONSTRUCTURAL PROTEIN NSS
  • NUCLEOCAPSID PROTEIN
  • ENDOTHELIAL-CELLS
  • FEVER VIRUS
  • NONPATHOGENIC HANTAVIRUSES
  • HEMORRHAGIC-FEVER
  • RNA-POLYMERASE
  • HANTAAN VIRUS
  • I INTERFERON
  • MXA PROTEIN

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