Protease-Mediated Entry via the Endosome of Human Coronavirus 229E

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Published inJournal of Virology Vol. 83; no. 2; pp. 712 - 721
Main Authors Kawase, Miyuki, Shirato, Kazuya, Matsuyama, Shutoku, Taguchi, Fumihiro
Format Journal Article
LanguageEnglish
Published Washington, DC American Society for Microbiology 15.01.2009
American Society for Microbiology (ASM)
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AbstractList Human coronavirus 229E, classified as a group I coronavirus, utilizes human aminopeptidase N (APN) as a receptor; however, its entry mechanism has not yet been fully elucidated. We found that HeLa cells infected with 229E via APN formed syncytia when treated with trypsin or other proteases but not in a low-pH environment, a finding consistent with syncytium formation by severe acute respiratory syndrome coronavirus (SARS-CoV). In addition, trypsin induced cleavage of the 229E S protein. By using infectious viruses and pseudotyped viruses bearing the 229E S protein, we found that its infection was profoundly blocked by lysosomotropic agents as well as by protease inhibitors that also prevented infection with SARS-CoV but not that caused by murine coronavirus mouse hepatitis virus strain JHMV, which enters cells directly from the cell surface. We found that cathepsin L (CPL) inhibitors blocked 229E infection the most remarkably among a variety of protease inhibitors tested. Furthermore, 229E infection was inhibited in CPL knockdown cells by small interfering RNA, compared with what was seen for a normal counterpart producing CPL. However, its inhibition was not so remarkable as that found with SARS-CoV infection, which seems to indicate that while CPL is involved in the fusogenic activation of 229E S protein in endosomal infection, not-yet-identified proteases could also play a part in that activity. We also found 229E virion S protein to be cleaved by CPL. Furthermore, as with SARS-CoV, 229E entered cells directly from the cell surface when cell-attached viruses were treated with trypsin. These findings suggest that 229E takes an endosomal pathway for cell entry and that proteases like CPL are involved in this mode of entry.
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Human coronavirus 229E, classified as a group I coronavirus, utilizes human aminopeptidase N (APN) as a receptor; however, its entry mechanism has not yet been fully elucidated. We found that HeLa cells infected with 229E via APN formed syncytia when treated with trypsin or other proteases but not in a low-pH environment, a finding consistent with syncytium formation by severe acute respiratory syndrome coronavirus (SARS-CoV). In addition, trypsin induced cleavage of the 229E S protein. By using infectious viruses and pseudotyped viruses bearing the 229E S protein, we found that its infection was profoundly blocked by lysosomotropic agents as well as by protease inhibitors that also prevented infection with SARS-CoV but not that caused by murine coronavirus mouse hepatitis virus strain JHMV, which enters cells directly from the cell surface. We found that cathepsin L (CPL) inhibitors blocked 229E infection the most remarkably among a variety of protease inhibitors tested. Furthermore, 229E infection was inhibited in CPL knockdown cells by small interfering RNA, compared with what was seen for a normal counterpart producing CPL. However, its inhibition was not so remarkable as that found with SARS-CoV infection, which seems to indicate that while CPL is involved in the fusogenic activation of 229E S protein in endosomal infection, not-yet-identified proteases could also play a part in that activity. We also found 229E virion S protein to be cleaved by CPL. Furthermore, as with SARS-CoV, 229E entered cells directly from the cell surface when cell-attached viruses were treated with trypsin. These findings suggest that 229E takes an endosomal pathway for cell entry and that proteases like CPL are involved in this mode of entry.Human coronavirus 229E, classified as a group I coronavirus, utilizes human aminopeptidase N (APN) as a receptor; however, its entry mechanism has not yet been fully elucidated. We found that HeLa cells infected with 229E via APN formed syncytia when treated with trypsin or other proteases but not in a low-pH environment, a finding consistent with syncytium formation by severe acute respiratory syndrome coronavirus (SARS-CoV). In addition, trypsin induced cleavage of the 229E S protein. By using infectious viruses and pseudotyped viruses bearing the 229E S protein, we found that its infection was profoundly blocked by lysosomotropic agents as well as by protease inhibitors that also prevented infection with SARS-CoV but not that caused by murine coronavirus mouse hepatitis virus strain JHMV, which enters cells directly from the cell surface. We found that cathepsin L (CPL) inhibitors blocked 229E infection the most remarkably among a variety of protease inhibitors tested. Furthermore, 229E infection was inhibited in CPL knockdown cells by small interfering RNA, compared with what was seen for a normal counterpart producing CPL. However, its inhibition was not so remarkable as that found with SARS-CoV infection, which seems to indicate that while CPL is involved in the fusogenic activation of 229E S protein in endosomal infection, not-yet-identified proteases could also play a part in that activity. We also found 229E virion S protein to be cleaved by CPL. Furthermore, as with SARS-CoV, 229E entered cells directly from the cell surface when cell-attached viruses were treated with trypsin. These findings suggest that 229E takes an endosomal pathway for cell entry and that proteases like CPL are involved in this mode of entry.
Author Miyuki Kawase
Shutoku Matsuyama
Fumihiro Taguchi
Kazuya Shirato
AuthorAffiliation Laboratory of Respiratory Viral Infections, Department of Virology III, National Institute of Infectious Diseases, Musashi-Murayama, 208-0011 Tokyo, Japan
AuthorAffiliation_xml – name: Laboratory of Respiratory Viral Infections, Department of Virology III, National Institute of Infectious Diseases, Musashi-Murayama, 208-0011 Tokyo, Japan
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  givenname: Kazuya
  surname: Shirato
  fullname: Shirato, Kazuya
  organization: Laboratory of Respiratory Viral Infections, Department of Virology III, National Institute of Infectious Diseases, Musashi-Murayama, 208-0011 Tokyo, Japan
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  givenname: Shutoku
  surname: Matsuyama
  fullname: Matsuyama, Shutoku
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  organization: Laboratory of Respiratory Viral Infections, Department of Virology III, National Institute of Infectious Diseases, Musashi-Murayama, 208-0011 Tokyo, Japan
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Corresponding author. Mailing address: Laboratory of Viral Respiratory Infections, Department of Virology III, National Institute of Infectious Diseases, Musashi-Murayama, 208-0011 Tokyo, Japan. Phone: 81-42-561-0771, ext. 3533. Fax: 81-42-567-5631. E-mail: ftaguchi@nih.go.jp
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Snippet Article Usage Stats Services JVI Citing Articles Google Scholar PubMed Related Content Social Bookmarking CiteULike Delicious Digg Facebook Google+ Mendeley...
Human coronavirus 229E, classified as a group I coronavirus, utilizes human aminopeptidase N (APN) as a receptor; however, its entry mechanism has not yet been...
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SubjectTerms Biological and medical sciences
Cathepsin L
Cathepsins - antagonists & inhibitors
Cathepsins - metabolism
Coronavirus 229E, Human - physiology
Cysteine Endopeptidases - metabolism
Endosomes - virology
Fundamental and applied biological sciences. Psychology
Gene Knockdown Techniques
HeLa Cells
Human coronavirus 229e
Humans
Hydrogen-Ion Concentration
Membrane Glycoproteins - metabolism
Microbiology
Miscellaneous
Murine coronavirus
Murine hepatitis virus
Murine hepatitis virus - physiology
Peptide Hydrolases - metabolism
RNA, Small Interfering - genetics
RNA, Small Interfering - metabolism
SARS coronavirus
SARS Virus - physiology
Spike Glycoprotein, Coronavirus
Viral Envelope Proteins - metabolism
Viral Plaque Assay
Virology
Virus Internalization
Virus-Cell Interactions
Title Protease-Mediated Entry via the Endosome of Human Coronavirus 229E
URI http://jvi.asm.org/content/83/2/712.abstract
https://www.ncbi.nlm.nih.gov/pubmed/18971274
https://www.proquest.com/docview/21499830
https://www.proquest.com/docview/66783753
https://pubmed.ncbi.nlm.nih.gov/PMC2612384
Volume 83
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