Human parainfluenza virus type 4 is incapable of evading the interferon-induced antiviral effect
- PMID: 16282476
- PMCID: PMC1287573
- DOI: 10.1128/JVI.79.23.14756-14768.2005
Human parainfluenza virus type 4 is incapable of evading the interferon-induced antiviral effect
Abstract
The V proteins of some paramyxoviruses have developed the ability to efficiently inactivate STAT protein function as a countermeasure for evading interferon (IFN) responses. Human parainfluenza virus type 4 (hPIV4) is one of the rubulaviruses, which are members of the family Paramyxoviridae, and has a V protein with a highly conserved cysteine-rich domain that is the hallmark of paramyxovirus V proteins. In order to study the function of the hPIV4 V protein, we established HeLa cells expressing the hPIV4A V protein (HeLa/FlagPIV4V). The hPIV4 V protein had no ability to reduce the level of STAT1 or STAT2, although it associated with STAT1, STAT2, DDB1, and Cul4A. It interfered with neither STAT1 and STAT2 tyrosine phosphorylation nor IFN-induced STAT nuclear accumulation. In addition, HeLa/FlagPIV4V cells are fully sensitive to both beta interferon (IFN-beta) and IFN-gamma, indicating that the hPIV4 V protein has no ability to block IFN-induced signaling. We further established HeLa cells expressing various chimeric proteins between the hPIV2 and hPIV4A V proteins. The lack of IFN-antagonistic activity of the hPIV4 V protein is caused by both the P/V common and V-specific domains. At least two regions (amino acids [aa] 32 to 45 and aa 143 to 164) of hPIV4 V in the P/V common domain and one region (aa 200 to 212) of the C terminus are involved in the inability to evade the IFN-induced signaling. Moreover, we established HeLa cells persistently infected with hPIV4 to make sure of the inability to escape IFN and confirmed that hPIV4 is the only paramyxovirus analyzed to date that can't evade the IFN-induced antiviral responses.
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