Key result
IBV Nsp15 endoribonuclease activity suppressed stress granule formation, while EndoU-deficient IBV induced colocalization of viral N protein/dsRNA with TIA1, suppressing viral replication.
Why the study?
Endoribonuclease is conserved in coronaviruses and affects viral replication and pathogenicity, and IBV causes substantial economic losses to the poultry industry.
Mutating the viral endoribonuclease poly(U) in IBV induces stress granule formation and impairs viral replication, suggesting a potential antiviral target for coronaviruses.
Answers are grounded in this paper and cite their sources.
Supports further investigation of coronavirus endoribonucleases as antiviral targets; should not yet influence clinical management of human infections.
Endoribonuclease is conserved in coronaviruses and affects viral replication and pathogenicity. Infectious bronchitis virus (IBV), a γ-coronavirus, infects respiratory, renal, and reproductive systems, causing millions of dollars in lost revenue to the poultry industry worldwide annually. Mutating the viral endoribonuclease poly(U) resulted in SG formation, and TIA1 protein colocalized with the viral N protein and dsRNA, thus damaging IBV replication. These results suggest a new antiviral target design strategy for coronaviruses.
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Zhao et al. (2022) studied Infectious bronchitis virus (IBV) infection. EndoU-deficient IBV / Nsp15 endoribonuclease mutation vs. Wild-type IBV was evaluated on Stress granule formation and viral replication. IBV Nsp15 endoribonuclease activity suppressed stress granule formation, while EndoU-deficient IBV induced colocalization of viral N protein/dsRNA with TIA1, suppressing viral replication.
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