ArticleJournal of immunology (Baltimore, Md. : 1950)2020
Middle East Respiratory Syndrome Coronavirus ORF8b Accessory Protein Suppresses Type I IFN Expression by Impeding HSP70-Dependent Activation of IRF3 Kinase IKKε.
Article in Journal of immunology (Baltimore, Md. : 1950), 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 31 papers.
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Who cites it
31 citing papers in PubMed, 44 citations in OpenAlex.
- Modulation of Host Innate Immune Response by Highly Pathogenic Human Coronaviruses during Viral Infection.Journal of microbiology and biotechnology · 2026Review
- Investigating the Potential Role of Capsaicin in Facilitating the Spread of Coxsackievirus B3 via Extracellular Vesicles.International journal of molecular sciences · 2026Article
- MERS-CoV accessory ORF proteins in innate immune evasion: an evidence-graded functional framework.Frontiers in immunology · 2026Review
- Airway immunometabolic responses during pulmonary bacterial and viral infections.Cell reports · 2025Review
- Heterologous expression of HCoV-HKU1 ORF 7b by mouse hepatitis virus protects against severe disease during murine infection.PLoS pathogens · 2025Article
- Betacoronavirus internal protein: role in immune evasion and viral pathogenesis.Journal of virology · 2025Review
- Review
- MERS-CoV-nsp5 expression in human epithelial BEAS 2b cells attenuates type I interferon production by inhibiting IRF3 nuclear translocation.Cellular and molecular life sciences : CMLS · 2024Article
- Mouse hepatitis virus JHMV I protein is required for maximal virulence.Journal of virology · 2024Article
- Molluscum contagiosum virus protein MC089 inhibits interferon regulatory factor 3 activation.The Journal of general virology · 2024Article
- NFκB and NLRP3/NLRC4 inflammasomes regulate differentiation, activation and functional properties of monocytes in response to distinct SARS-CoV-2 proteins.Nature communications · 2024Article
- RanBP2/Nup358 Mediates Sumoylation of STAT1 and Antagonizes Interferon-α-Mediated Antiviral Innate Immunity.International journal of molecular sciences · 2023Article
- Epstein-Barr Virus Envelope Glycoprotein gp110 Inhibits IKKi-Mediated Activation of NF-κB and Promotes the Degradation of β-Catenin.Microbiology spectrum · 2023Article
- Suppression of cGAS- and RIG-I-mediated innate immune signaling by Epstein-Barr virus deubiquitinase BPLF1.PLoS pathogens · 2023Article
- Plant Molecular Pharming and Plant-Derived Compounds towards Generation of Vaccines and Therapeutics against Coronaviruses.Vaccines · 2022Review
- UBR5 Acts as an Antiviral Host Factor against MERS-CoV via Promoting Ubiquitination and Degradation of ORF4b.Journal of virology · 2022Article
- Article
- Homology-based classification of accessory proteins in coronavirus genomes uncovers extremely dynamic evolution of gene content.Molecular ecology · 2022Article
- Intranasal administration of a single dose of a candidate live attenuated vaccine derived from an NSP16-deficient SARS-CoV-2 strain confers sterilizing immunity in animals.Cellular & molecular immunology · 2022Article
- The N-Terminal Region of Middle East Respiratory Syndrome Coronavirus Accessory Protein 8b Is Essential for Enhanced Virulence of an Attenuated Murine Coronavirus.Journal of virology · 2022Article
Corrections and comments
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Authors and funding
15 authors at 2 institutions in 1 country.
Funding
Abstract
Middle East respiratory syndrome coronavirus (MERS-CoV) is a highly pathogenic human coronavirus causing severe disease and mortality. MERS-CoV infection failed to elicit robust IFN response, suggesting that the virus might have evolved strategies to evade host innate immune surveillance. In this study, we identified and characterized type I IFN antagonism of MERS-CoV open reading frame (ORF) 8b accessory protein. ORF8b was abundantly expressed in MERS-CoV-infected Huh-7 cells. When ectopically expressed, ORF8b inhibited IRF3-mediated IFN-β expression induced by Sendai virus and poly(I:C). ORF8b was found to act at a step upstream of IRF3 to impede the interaction between IRF3 kinase IKKε and chaperone protein HSP70, which is required for the activation of IKKε and IRF3. An infection study using recombinant wild-type and ORF8b-deficient MERS-CoV further confirmed the suppressive role of ORF8b in type I IFN induction and its disruption of the colocalization of HSP70 with IKKε. Ectopic expression of HSP70 relieved suppression of IFN-β expression by ORF8b in an IKKε-dependent manner. Enhancement of IFN-β induction in cells infected with ORF8b-deficient virus was erased when HSP70 was depleted. Taken together, HSP70 chaperone is important for IKKε activation, and MERS-CoV ORF8b suppresses type I IFN expression by competing with IKKε for interaction with HSP70.
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