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Middle East respiratory syndrome coronavirus M protein suppresses type I interferon expression through the inhibition of TBK1-dependent phosphorylation of IRF3.

Identifieur interne : 000F85 ( Main/Exploration ); précédent : 000F84; suivant : 000F86

Middle East respiratory syndrome coronavirus M protein suppresses type I interferon expression through the inhibition of TBK1-dependent phosphorylation of IRF3.

Auteurs : Pak-Yin Lui [République populaire de Chine] ; Lok-Yin Roy Wong [République populaire de Chine] ; Cheuk-Lai Fung [République populaire de Chine] ; Kam-Leung Siu [République populaire de Chine] ; Man-Lung Yeung [République populaire de Chine] ; Kit-San Yuen [République populaire de Chine] ; Chi-Ping Chan [République populaire de Chine] ; Patrick Chiu-Yat Woo [République populaire de Chine] ; Kwok-Yung Yuen [République populaire de Chine] ; Dong-Yan Jin [République populaire de Chine]

Source :

RBID : pubmed:27094905

Descripteurs français

English descriptors

Abstract

Middle East respiratory syndrome coronavirus (MERS-CoV) infection has claimed hundreds of lives and has become a global threat since its emergence in Saudi Arabia in 2012. The ability of MERS-CoV to evade the host innate antiviral response may contribute to its severe pathogenesis. Many MERS-CoV-encoded proteins were identified to have interferon (IFN)-antagonizing properties, which correlates well with the reduced IFN levels observed in infected patients and ex vivo models. In this study, we fully characterized the IFN-antagonizing property of the MERS-CoV M protein. Expression of MERS-CoV M protein suppressed type I IFN expression in response to Sendai virus infection or poly(I:C) induction. This suppressive effect was found to be specific for the activation of IFN regulatory factor 3 (IRF3) but not nuclear factor-κB. MERS-CoV M protein interacted with TRAF3 and disrupted TRAF3-TBK1 association leading to reduced IRF3 activation. M proteins from MERS-CoV and SARS-CoV have three highly similar conserved N-terminal transmembrane domains and a C-terminal region. Using chimeric and truncation mutants, the N-terminal transmembrane domains of the MERS-CoV M protein were found to be sufficient for its inhibitory effect on IFN expression, whereas the C-terminal domain was unable to induce this suppression. Collectively, our findings suggest a common and conserved mechanism through which highly pathogenic MERS-CoV and SARS-CoV harness their M proteins to suppress type I IFN expression at the level of TBK1-dependent phosphorylation and activation of IRF3 resulting in evasion of the host innate antiviral response.

DOI: 10.1038/emi.2016.33
PubMed: 27094905


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<front>
<div type="abstract" xml:lang="en">Middle East respiratory syndrome coronavirus (MERS-CoV) infection has claimed hundreds of lives and has become a global threat since its emergence in Saudi Arabia in 2012. The ability of MERS-CoV to evade the host innate antiviral response may contribute to its severe pathogenesis. Many MERS-CoV-encoded proteins were identified to have interferon (IFN)-antagonizing properties, which correlates well with the reduced IFN levels observed in infected patients and ex vivo models. In this study, we fully characterized the IFN-antagonizing property of the MERS-CoV M protein. Expression of MERS-CoV M protein suppressed type I IFN expression in response to Sendai virus infection or poly(I:C) induction. This suppressive effect was found to be specific for the activation of IFN regulatory factor 3 (IRF3) but not nuclear factor-κB. MERS-CoV M protein interacted with TRAF3 and disrupted TRAF3-TBK1 association leading to reduced IRF3 activation. M proteins from MERS-CoV and SARS-CoV have three highly similar conserved N-terminal transmembrane domains and a C-terminal region. Using chimeric and truncation mutants, the N-terminal transmembrane domains of the MERS-CoV M protein were found to be sufficient for its inhibitory effect on IFN expression, whereas the C-terminal domain was unable to induce this suppression. Collectively, our findings suggest a common and conserved mechanism through which highly pathogenic MERS-CoV and SARS-CoV harness their M proteins to suppress type I IFN expression at the level of TBK1-dependent phosphorylation and activation of IRF3 resulting in evasion of the host innate antiviral response. </div>
</front>
</TEI>
<affiliations>
<list>
<country>
<li>République populaire de Chine</li>
</country>
</list>
<tree>
<country name="République populaire de Chine">
<noRegion>
<name sortKey="Lui, Pak Yin" sort="Lui, Pak Yin" uniqKey="Lui P" first="Pak-Yin" last="Lui">Pak-Yin Lui</name>
</noRegion>
<name sortKey="Chan, Chi Ping" sort="Chan, Chi Ping" uniqKey="Chan C" first="Chi-Ping" last="Chan">Chi-Ping Chan</name>
<name sortKey="Fung, Cheuk Lai" sort="Fung, Cheuk Lai" uniqKey="Fung C" first="Cheuk-Lai" last="Fung">Cheuk-Lai Fung</name>
<name sortKey="Jin, Dong Yan" sort="Jin, Dong Yan" uniqKey="Jin D" first="Dong-Yan" last="Jin">Dong-Yan Jin</name>
<name sortKey="Siu, Kam Leung" sort="Siu, Kam Leung" uniqKey="Siu K" first="Kam-Leung" last="Siu">Kam-Leung Siu</name>
<name sortKey="Wong, Lok Yin Roy" sort="Wong, Lok Yin Roy" uniqKey="Wong L" first="Lok-Yin Roy" last="Wong">Lok-Yin Roy Wong</name>
<name sortKey="Woo, Patrick Chiu Yat" sort="Woo, Patrick Chiu Yat" uniqKey="Woo P" first="Patrick Chiu-Yat" last="Woo">Patrick Chiu-Yat Woo</name>
<name sortKey="Yeung, Man Lung" sort="Yeung, Man Lung" uniqKey="Yeung M" first="Man-Lung" last="Yeung">Man-Lung Yeung</name>
<name sortKey="Yuen, Kit San" sort="Yuen, Kit San" uniqKey="Yuen K" first="Kit-San" last="Yuen">Kit-San Yuen</name>
<name sortKey="Yuen, Kwok Yung" sort="Yuen, Kwok Yung" uniqKey="Yuen K" first="Kwok-Yung" last="Yuen">Kwok-Yung Yuen</name>
</country>
</tree>
</affiliations>
</record>

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