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FEAR antiviral response pathway is independent of interferons and countered by poxvirus proteins

ABSTRACT: FEAR antiviral response pathway is independent of interferons and countered by poxvirus proteins

PROVIDER: PRJNA770967 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR16313957_1.fastq.gz	Fastqsanger.gz
	SRR16313957_2.fastq.gz	Fastqsanger.gz
	SRR16313958_1.fastq.gz	Fastqsanger.gz
	SRR16313958_2.fastq.gz	Fastqsanger.gz
	SRR16313959_1.fastq.gz	Fastqsanger.gz

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FEAR antiviral response pathway is independent of interferons and countered by poxvirus proteins

Project description:The human facilitates chromatin transcription (FACT) complex is a chromatin remodeller composed of human suppressor of Ty 16 homologue (hSpt16) and structure-specific recognition protein-1 subunits that regulates cellular gene expression. Whether FACT regulates host responses to infection remained unclear. We identify a FACT-mediated, interferon-independent, antiviral pathway that restricts poxvirus replication. Cell culture and bioinformatics approaches suggest that early viral gene expression triggers nuclear accumulation of SUMOylated hSpt16 subunits required for the expression of E26 transformation-specific sequence-1 (ETS-1)-a transcription factor that activates virus restriction programs. However, biochemical studies show that poxvirus-encoded A51R proteins block ETS-1 expression by outcompeting structure-specific recognition protein-1 binding to SUMOylated hSpt16 and by tethering SUMOylated hSpt16 to microtubules. Furthermore, A51R antagonism of FACT enhances poxvirus replication in human cells and virulence in mice. Finally, we show that FACT also restricts rhabdoviruses, flaviviruses and orthomyxoviruses, suggesting broad roles for FACT in antiviral immunity. Our study reveals the FACT-ETS-1 antiviral response (FEAR) pathway to be critical for eukaryotic antiviral immunity and describes a unique mechanism of viral immune evasion.

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Project description:Background Vaccinia virus (VACV) infection induces prominent changes in host cell metabolism. Little is known about the global metabolic reprogramming that takes place in the whole tissue during viral infection. Here, we performed an unbiased longitudinal metabolomics study in VACV-infected mice to investigate metabolic changes in the tissue during infection. We assessed metabolites in homogenized skin over time in the presence or absence of antigen-specific T cells using untargeted mass spectrometry. VACV infection induced several significant metabolic changes, including in the levels of nucleic acid metabolites (reflecting the impact of viral replication on the skin metabolome). Furthermore, monocyte- and antiviral T cell-produced metabolites, including itaconic acid, glutamine, and glutathione, were significantly increased following infection, highlighting the immune response’s contribution to the global skin metabolome. Additional RNA-Seq of infected skin tissue recapitulated transcriptional changes identified via metabolomics. Overall, our study reveals the metabolic balance of viral replication and the antiviral immune response in the skin and identifies metabolic pathways that could contribute to cutaneous poxvirus control in vivo.

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