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- W3203287622 abstract "Viral antagonism of innate immune pathways is a common mechanism by which viruses evade immune surveillance. Infection of host cells with reovirus leads to the blockade of NF-κB, a key transcriptional regulator of the host's innate immune response. One mechanism by which reovirus infection results in inhibition of NF-κB is through a diminishment in levels of upstream activators, IKKβ and NEMO. Here, we demonstrate a second, distinct mechanism by which reovirus blocks NF-κB. We report that expression of a single viral protein, σ3, is sufficient to inhibit expression of NF-κB target genes. Further, σ3-mediated blockade of NF-κB occurs without changes to IKK levels or activity. Expression of only a subset of NF-κB target genes is reduced. Among NF-κB targets, the expression of type I interferon is significantly diminished by σ3 expression. Correspondingly, ectopic expression of σ3 enhances viral replication. Expression of NF-κB target genes varies following infection with closely related reovirus strains. Our genetic analysis identifies that these differences are controlled by polymorphisms in the amino acid sequence of σ3. This work identifies a new role for reovirus σ3 as a viral antagonist of the NF-κB-dependent antiviral pathways." @default.
- W3203287622 created "2021-10-11" @default.
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- W3203287622 date "2021-10-06" @default.
- W3203287622 modified "2023-10-16" @default.
- W3203287622 title "The reovirus σ3 protein inhibits NF-κB-dependent antiviral signaling" @default.
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- W3203287622 doi "https://doi.org/10.1101/2021.10.05.463132" @default.
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