Middle East Respiratory Syndrome Coronavirus Spike Protein Is Not Activated Directly by Cellular Furin during Viral Entry into Target Cells.
Identifieur interne : 000832 ( PubMed/Corpus ); précédent : 000831; suivant : 000833Middle East Respiratory Syndrome Coronavirus Spike Protein Is Not Activated Directly by Cellular Furin during Viral Entry into Target Cells.
Auteurs : Shutoku Matsuyama ; Kazuya Shirato ; Miyuki Kawase ; Yutaka Terada ; Kengo Kawachi ; Shuetsu Fukushi ; Wataru KamitaniSource :
- Journal of virology [ 1098-5514 ] ; 2018.
English descriptors
- KwdEn :
- Amino Acid Chloromethyl Ketones (pharmacology), Animals, Cathepsin B (antagonists & inhibitors), Cathepsin B (genetics), Cathepsin B (metabolism), Cathepsin L (antagonists & inhibitors), Cathepsin L (genetics), Cathepsin L (metabolism), Chlorocebus aethiops, Furin (antagonists & inhibitors), Furin (genetics), Furin (metabolism), Humans, Middle East Respiratory Syndrome Coronavirus (genetics), Middle East Respiratory Syndrome Coronavirus (metabolism), Papain (antagonists & inhibitors), Papain (genetics), Papain (metabolism), Proteolysis, Serine Endopeptidases (genetics), Serine Endopeptidases (metabolism), Spike Glycoprotein, Coronavirus (genetics), Spike Glycoprotein, Coronavirus (metabolism), Vero Cells, Virus Internalization.
- MESH :
- chemical , antagonists & inhibitors : Cathepsin B, Cathepsin L, Furin, Papain.
- chemical , genetics : Cathepsin B, Cathepsin L, Furin, Papain, Serine Endopeptidases, Spike Glycoprotein, Coronavirus.
- chemical , metabolism : Cathepsin B, Cathepsin L, Furin, Papain, Serine Endopeptidases, Spike Glycoprotein, Coronavirus.
- chemical , pharmacology : Amino Acid Chloromethyl Ketones.
- genetics : Middle East Respiratory Syndrome Coronavirus.
- metabolism : Middle East Respiratory Syndrome Coronavirus.
- Animals, Chlorocebus aethiops, Humans, Proteolysis, Vero Cells, Virus Internalization.
Abstract
Middle East respiratory syndrome coronavirus (MERS-CoV) utilizes host cellular proteases to enter cells. A previous report shows that furin, which is distributed mainly in the Golgi apparatus and cycled to the cell surface and endosomes, proteolytically activates the MERS-CoV spike (S) protein following receptor binding to mediate fusion between the viral and cellular membranes. In this study, we reexamined furin usage by MERS-CoV using a real-time PCR-based virus cell entry assay after inhibition of cellular proteases. We found that the furin inhibitor dec-RVKR-CMK blocked entry of MERS-CoV harboring an S protein lacking furin cleavage sites; it even blocked entry into furin-deficient LoVo cells. In addition, dec-RVKR-CMK inhibited not only the enzymatic activity of furin but also those of cathepsin L, cathepsin B, trypsin, papain, and TMPRSS2. Furthermore, a virus cell entry assay and a cell-cell fusion assay provided no evidence that the S protein was activated by exogenous furin. Therefore, we conclude that furin does not play a role in entry of MERS-CoV into cells and that the inhibitory effect of dec-RVKR-CMK is specific for TMPRSS2 and cathepsin L rather than furin.IMPORTANCE Previous studies using the furin inhibitor dec-RVKR-CMK suggest that MERS-CoV utilizes a cellular protease, furin, to activate viral glycoproteins during cell entry. However, we found that dec-RVKR-CMK inhibits not only furin but also other proteases. Furthermore, we found no evidence that MERS-CoV uses furin. These findings suggest that previous studies in the virology field based on dec-RVKR-CMK should be reexamined carefully. Here we describe appropriate experiments that can be used to assess the effect of protease inhibitors on virus cell entry.
DOI: 10.1128/JVI.00683-18
PubMed: 30021905
Links to Exploration step
pubmed:30021905Le document en format XML
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<term>Cathepsin B (genetics)</term>
<term>Cathepsin B (metabolism)</term>
<term>Cathepsin L (antagonists & inhibitors)</term>
<term>Cathepsin L (genetics)</term>
<term>Cathepsin L (metabolism)</term>
<term>Chlorocebus aethiops</term>
<term>Furin (antagonists & inhibitors)</term>
<term>Furin (genetics)</term>
<term>Furin (metabolism)</term>
<term>Humans</term>
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<term>Middle East Respiratory Syndrome Coronavirus (metabolism)</term>
<term>Papain (antagonists & inhibitors)</term>
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<term>Papain (metabolism)</term>
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<term>Serine Endopeptidases (genetics)</term>
<term>Serine Endopeptidases (metabolism)</term>
<term>Spike Glycoprotein, Coronavirus (genetics)</term>
<term>Spike Glycoprotein, Coronavirus (metabolism)</term>
<term>Vero Cells</term>
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<front><div type="abstract" xml:lang="en">Middle East respiratory syndrome coronavirus (MERS-CoV) utilizes host cellular proteases to enter cells. A previous report shows that furin, which is distributed mainly in the Golgi apparatus and cycled to the cell surface and endosomes, proteolytically activates the MERS-CoV spike (S) protein following receptor binding to mediate fusion between the viral and cellular membranes. In this study, we reexamined furin usage by MERS-CoV using a real-time PCR-based virus cell entry assay after inhibition of cellular proteases. We found that the furin inhibitor dec-RVKR-CMK blocked entry of MERS-CoV harboring an S protein lacking furin cleavage sites; it even blocked entry into furin-deficient LoVo cells. In addition, dec-RVKR-CMK inhibited not only the enzymatic activity of furin but also those of cathepsin L, cathepsin B, trypsin, papain, and TMPRSS2. Furthermore, a virus cell entry assay and a cell-cell fusion assay provided no evidence that the S protein was activated by exogenous furin. Therefore, we conclude that furin does not play a role in entry of MERS-CoV into cells and that the inhibitory effect of dec-RVKR-CMK is specific for TMPRSS2 and cathepsin L rather than furin.<b>IMPORTANCE</b>
Previous studies using the furin inhibitor dec-RVKR-CMK suggest that MERS-CoV utilizes a cellular protease, furin, to activate viral glycoproteins during cell entry. However, we found that dec-RVKR-CMK inhibits not only furin but also other proteases. Furthermore, we found no evidence that MERS-CoV uses furin. These findings suggest that previous studies in the virology field based on dec-RVKR-CMK should be reexamined carefully. Here we describe appropriate experiments that can be used to assess the effect of protease inhibitors on virus cell entry.</div>
</front>
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<ArticleTitle>Middle East Respiratory Syndrome Coronavirus Spike Protein Is Not Activated Directly by Cellular Furin during Viral Entry into Target Cells.</ArticleTitle>
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<Abstract><AbstractText>Middle East respiratory syndrome coronavirus (MERS-CoV) utilizes host cellular proteases to enter cells. A previous report shows that furin, which is distributed mainly in the Golgi apparatus and cycled to the cell surface and endosomes, proteolytically activates the MERS-CoV spike (S) protein following receptor binding to mediate fusion between the viral and cellular membranes. In this study, we reexamined furin usage by MERS-CoV using a real-time PCR-based virus cell entry assay after inhibition of cellular proteases. We found that the furin inhibitor dec-RVKR-CMK blocked entry of MERS-CoV harboring an S protein lacking furin cleavage sites; it even blocked entry into furin-deficient LoVo cells. In addition, dec-RVKR-CMK inhibited not only the enzymatic activity of furin but also those of cathepsin L, cathepsin B, trypsin, papain, and TMPRSS2. Furthermore, a virus cell entry assay and a cell-cell fusion assay provided no evidence that the S protein was activated by exogenous furin. Therefore, we conclude that furin does not play a role in entry of MERS-CoV into cells and that the inhibitory effect of dec-RVKR-CMK is specific for TMPRSS2 and cathepsin L rather than furin.<b>IMPORTANCE</b>
Previous studies using the furin inhibitor dec-RVKR-CMK suggest that MERS-CoV utilizes a cellular protease, furin, to activate viral glycoproteins during cell entry. However, we found that dec-RVKR-CMK inhibits not only furin but also other proteases. Furthermore, we found no evidence that MERS-CoV uses furin. These findings suggest that previous studies in the virology field based on dec-RVKR-CMK should be reexamined carefully. Here we describe appropriate experiments that can be used to assess the effect of protease inhibitors on virus cell entry.</AbstractText>
<CopyrightInformation>Copyright © 2018 American Society for Microbiology.</CopyrightInformation>
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<ForeName>Shutoku</ForeName>
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<Initials>Y</Initials>
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</AffiliationInfo>
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<Initials>K</Initials>
<AffiliationInfo><Affiliation>Laboratory of Clinical Research on Infectious Diseases, Osaka University, Osaka, Japan.</Affiliation>
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<Author ValidYN="Y"><LastName>Fukushi</LastName>
<ForeName>Shuetsu</ForeName>
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