1887

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Volume 88, Issue 11

West Nile virus-induced cytoplasmic membrane structures provide partial protection against the interferon-induced antiviral MxA protein Free

Abstract

The human MxA protein is a type I and III interferon (IFN)-induced protein with proven antiviral activity against RNA viruses. In this study, we investigated the effect of MxA expression on the replication of West Nile Virus strain Kunjin (WNV). Pretreatment of A549 cells with IFN- lead to increased expression of MxA, which contributed to inhibition of WNV replication and secretion. However, in Vero cells stably expressing the MxA protein, WNV replication, maturation and secretion was not inhibited. Biochemical and subcellular localization studies of WNV proteins and MxA suggest that the MxA activity was not compromised by a flavivirus-encoded antagonist. Instead, we show that characteristic membranous structures induced during WNV replication provide partial protection from MxA, possibly by ‘hiding’ WNV replication components. This distinct compartmentalization of viral replication and components of the cellular antiviral response may be an evolutionary mechanism by which flaviviruses can hide from host surveillance.

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2007-11-01
2023-09-25
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West Nile virus-induced cytoplasmic membrane structures provide partial protection against the interferon-induced antiviral MxA protein
J. Gen. Virol. 88, 3013 (2007); https://doi.org/10.1099/vir.0.83125-0
/content/journal/jgv/10.1099/vir.0.83125-0
/content/journal/jgv/10.1099/vir.0.83125-0
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