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Since 2012, MERS-CoV has been causing sporadic zoonotic infections in humans, which poses a risk of genetic evolution to become a pandemic virus. MERS-CoV genome encodes five accessory proteins, 3, 4a, 4b, 5 and 8b for which limited information is available in the context of infection. This work describes 4b as a virulence factor <jats:italic>in vivo<\/jats:italic>, since the deletion mutant of a mouse-adapted MERS-CoV-\u03944b (MERS-CoV-MA-\u03944b) was completely attenuated in a humanized DPP4 knock-in mouse model, resulting in no mortality. Attenuation in the absence of 4b was associated with a significant reduction in lung pathology and chemokine expression levels at 4 and 6 days post-infection, suggesting that 4b contributed to the induction of lung inflammatory pathology. The accumulation of 4b in the nucleus <jats:italic>in vivo<\/jats:italic> was not relevant to virulence, since deletion of its nuclear localization signal led to 100% mortality. Interestingly, the presence of 4b protein was found to regulate autophagy in the lungs of mice, leading to upregulation of BECN1, ATG3 and LC3A mRNA. Further analysis in MRC-5 cell line showed that, in the context of infection, MERS-CoV-MA 4b inhibited autophagy, as confirmed by the increase of p62 and the decrease of ULK1 protein levels, either by direct or indirect mechanisms. Together, these results correlated autophagy activation in the absence of 4b with downregulation of a pathogenic inflammatory response, thus contributing to attenuation of MERS-CoV-MA-\u03944b.<\/jats:p>","DOI":"10.1371\/journal.ppat.1010834","type":"journal-article","created":{"date-parts":[[2022,9,21]],"date-time":"2022-09-21T17:28:39Z","timestamp":1663781319000},"page":"e1010834","update-policy":"https:\/\/doi.org\/10.1371\/journal.ppat.corrections_policy","source":"Crossref","is-referenced-by-count":17,"title":["MERS-CoV ORF4b is a virulence factor involved in the inflammatory pathology induced in the lungs of 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