1887

Abstract

The sixth genomic segment of (THOV) encodes two proteins, the viral matrix protein (M) and an accessory protein with an interferon (IFN)-antagonistic function named ML. M and ML are shown in this study to be structural components of the virion. Using an system based on the reconstitution of functional THOV ribonucleoprotein complexes from cloned cDNAs, it was demonstrated that M has an inhibitory effect on the viral RNA-dependent RNA polymerase (RdRP) and is essential for the formation of virus-like particles (VLPs). The functional domain responsible for the regulation of RdRP activity resides within the C-terminal half of M, while full-length M protein is required for VLP formation. The ML protein cannot complement M with respect to either RdRP downregulation or particle formation, although it is identical to M apart from a 38 aa extension at the C terminus. In contrast, ML, but not M, is able to prevent the induction of IFN- by double-stranded RNA. This function is contained within the C-terminal half of ML. These data suggest major structural differences between M and ML that could explain the different activities of the two proteins.

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2004-12-01
2019-11-18
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