Disruption of interferon-β production by the Npro of atypical porcine pestivirus.

Abstract:

:Atypical porcine pestivirus (APPV) is an emerging porcine virus that threatens global swine production. Pestiviruses can prevent interferon (IFN) production to avoid the host innate immune response, and the Npro viral protein can play a critical role. Knowledge of the host immune response to APPV infection is limited. Here, we showed that the IFN-β production was suppressed by APPV-Npro and the IFN regulatory factor 3 (IRF3) promoter activity stimulated by adaptor molecules of the IFN-β signaling pathway was also inhibited in the APPV-Npro-expressed cells. The APPV-Npro was able to interact with IRF3 and interfere the phosphorylation of IRF3, indicated that the IFN-β antagonism of APPV-Npro mainly depended on blocking IRF3 activity. To identify the functional region of APPV-Npro, a panel of truncated APPV-Npro was constructed, and its influence on the IRF3 activation was investigated. The results showed that the N-terminal 31-51 amino acids of APPV-Npro were mainly associated with inhibition of the IFN-β response. Taken together, this is the first study focusing on elucidating the function of APPV protein by revealing a novel mechanism of Npro in disruption of host IFN-β production, which will enlighten future study in addressing APPV pathogenesis and immune evasion.

journal_name

Virulence

journal_title

Virulence

authors

Mou C,Pan S,Wu H,Chen Z

doi

10.1080/21505594.2021.1880773

keywords:

["Atypical porcine pestivirus","IFN regulatory factor 3","IFN-β production","nonstructural protein Npro "]

subject

Has Abstract

pub_date

2021-12-01 00:00:00

pages

654-665

issue

1

eissn

2150-5594

issn

2150-5608

journal_volume

12

pub_type

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