O-GlcNAc transferase promotes influenza A virus–induced cytokine storm by targeting interferon regulatory factor–5

IAV regulates inflammatory signaling via glucose metabolism. In this study, we demonstrated an essential function of the hexosamine biosynthesis pathway (HBP)–associated O-linked β-N-acetylglucosamine (O-GlcNAc) signaling in influenza A virus (IAV)–induced cytokine storm. O-GlcNAc transferase (OGT), a key enzyme for protein O-GlcNAcylation, mediated IAV-induced cytokine production. Upon investigating the mechanisms driving this event, we determined that IAV induced OGT to bind to interferon regulatory factor–5 (IRF5), leading to O-GlcNAcylation of IRF5 on serine-430. O-GlcNAcylation of IRF5 is required for K63-linked ubiquitination of IRF5 and subsequent cytokine production. Analysis of clinical samples revealed that IRF5 is O-GlcNAcylated, and higher levels of proinflammatory cytokines correlated with higher levels of blood glucose in IAV-infected patients. We identified a molecular mechanism by which HBP-mediated O-GlcNAcylation regulates IRF5 function during IAV infection, highlighting the importance of glucose metabolism in IAV-induced cytokine storm.

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