The ORF7b protein of severe acute respiratory syndrome coronavirus (SARS-CoV) is expressed in virus-infected cells and incorporated into SARS-CoV particles
Identifieur interne : 003B18 ( Main/Exploration ); précédent : 003B17; suivant : 003B19The ORF7b protein of severe acute respiratory syndrome coronavirus (SARS-CoV) is expressed in virus-infected cells and incorporated into SARS-CoV particles
Auteurs : Scott R. Schaecher [États-Unis] ; Jason M. Mackenzie [Australie] ; Andrew Pekosz [États-Unis]Source :
- Journal of virology [ 0022-538X ] ; 2007.
Descripteurs français
- KwdFr :
- Animaux, Cellules Vero, Données de séquences moléculaires, Humains, Lignée cellulaire, Protéines virales (), Protéines virales (génétique), Protéines virales (métabolisme), Séquence d'acides aminés, Séquence nucléotidique, Virion (métabolisme), Virus du SRAS (génétique), Virus du SRAS (métabolisme).
- MESH :
- génétique : Protéines virales, Virus du SRAS.
- métabolisme : Protéines virales, Virion, Virus du SRAS.
- Pascal (Inist)
English descriptors
- KwdEn :
- Amino Acid Sequence, Animals, Base Sequence, Cell Line, Chlorocebus aethiops, Humans, Infected cell, Molecular Sequence Data, Protein, SARS Virus (genetics), SARS Virus (metabolism), Severe acute respiratory syndrome, Severe acute respiratory syndrome virus, Vero Cells, Viral Proteins (chemistry), Viral Proteins (genetics), Viral Proteins (metabolism), Virion (metabolism), Virology.
- MESH :
- chemical , chemistry : Viral Proteins.
- genetics : SARS Virus, Viral Proteins.
- metabolism : SARS Virus, Viral Proteins, Virion.
- Amino Acid Sequence, Animals, Base Sequence, Cell Line, Chlorocebus aethiops, Humans, Molecular Sequence Data, Vero Cells.
Abstract
Coronavirus replication is facilitated by a number of highly conserved viral proteins. The viruses also encode accessory genes, which are virus group specific and believed to play roles in virus replication and pathogenesis in vivo. Of the eight putative accessory proteins encoded by the severe acute respiratory distress syndrome associated coronavirus (SARS-CoV), only two-open reading frame 3a (ORF3a) and ORF7a-have been identified in virus-infected cells to date. The ORF7b protein is a putative viral accessory protein encoded on subgenomic (sg) RNA 7. The ORF7b initiation codon overlaps the ORF7a stop codon in a-1 shifted ORF. We demonstrate that the ORF7b protein is expressed in virus-infected cell lysates and from a cDNA encoding the gene 7 coding region, indicating that the sgRNA7 is bicistronic. The translation of ORF7b appears to be mediated by ribosome leaky scanning, and the protein has biochemical properties consistent with that of an integral membrane protein. ORF7b localizes to the Golgi compartment and is incorporated into SARS-CoV particles. We therefore conclude that the ORF7b protein is not only an accessory protein but a structural component of the SARS-CoV virion.
Affiliations:
- Australie, États-Unis
- Missouri (État)
- Saint-Louis (Missouri)
- École de médecine (Université Washington de Saint-Louis)
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Le document en format XML
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The viruses also encode accessory genes, which are virus group specific and believed to play roles in virus replication and pathogenesis in vivo. Of the eight putative accessory proteins encoded by the severe acute respiratory distress syndrome associated coronavirus (SARS-CoV), only two-open reading frame 3a (ORF3a) and ORF7a-have been identified in virus-infected cells to date. The ORF7b protein is a putative viral accessory protein encoded on subgenomic (sg) RNA 7. The ORF7b initiation codon overlaps the ORF7a stop codon in a-1 shifted ORF. We demonstrate that the ORF7b protein is expressed in virus-infected cell lysates and from a cDNA encoding the gene 7 coding region, indicating that the sgRNA7 is bicistronic. The translation of ORF7b appears to be mediated by ribosome leaky scanning, and the protein has biochemical properties consistent with that of an integral membrane protein. ORF7b localizes to the Golgi compartment and is incorporated into SARS-CoV particles. We therefore conclude that the ORF7b protein is not only an accessory protein but a structural component of the SARS-CoV virion.</div></front></TEI><affiliations><list><country><li>Australie</li><li>États-Unis</li></country><region><li>Missouri (État)</li></region><settlement><li>Saint-Louis (Missouri)</li></settlement><orgName><li>École de médecine (Université Washington de Saint-Louis)</li></orgName></list><tree><country name="États-Unis"><region name="Missouri (État)"><name sortKey="Schaecher, Scott R" sort="Schaecher, Scott R" uniqKey="Schaecher S" first="Scott R." last="Schaecher">Scott R. Schaecher</name></region><name sortKey="Pekosz, Andrew" sort="Pekosz, Andrew" uniqKey="Pekosz A" first="Andrew" last="Pekosz">Andrew Pekosz</name><name sortKey="Pekosz, Andrew" sort="Pekosz, Andrew" uniqKey="Pekosz A" first="Andrew" last="Pekosz">Andrew Pekosz</name></country><country name="Australie"><noRegion><name sortKey="Mackenzie, Jason M" sort="Mackenzie, Jason M" uniqKey="Mackenzie J" first="Jason M." last="Mackenzie">Jason M. Mackenzie</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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