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 language | English |
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Pages (from-to) | 1527-1536 |
Number of pages | 10 |
Journal | Journal of Medical Virology |
Volume | 79 |
Issue number | 10 |
DOIs | |
Publication status | Published - 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