Genetic analysis of the SARS-coronavirus spike glycoprotein functional domains involved in cell-surface expression and cell-to-cell fusion.
Identifieur interne : 004822 ( Main/Exploration ); précédent : 004821; suivant : 004823Genetic analysis of the SARS-coronavirus spike glycoprotein functional domains involved in cell-surface expression and cell-to-cell fusion.
Auteurs : Chad M. Petit [États-Unis] ; Jeffrey M. Melancon ; Vladimir N. Chouljenko ; Robin Colgrove ; Michael Farzan ; David M. Knipe ; K G KousoulasSource :
- Virology [ 0042-6822 ] ; 2005.
Descripteurs français
- KwdFr :
- Animaux, Cellules Vero, Données de séquences moléculaires, Délétion de séquence, Fusion cellulaire, Fusion membranaire, Glycoprotéine de spicule des coronavirus, Glycoprotéines membranaires (), Glycoprotéines membranaires (génétique), Glycoprotéines membranaires (métabolisme), Glycoprotéines membranaires (physiologie), Immunohistochimie, Membrane cellulaire (), Mutation ponctuelle, Protéines de fusion virale (analyse), Protéines de l'enveloppe virale (), Protéines de l'enveloppe virale (génétique), Protéines de l'enveloppe virale (métabolisme), Protéines de l'enveloppe virale (physiologie), Structure tertiaire des protéines, Substitution d'acide aminé, Séquence d'acides aminés, Transport de protéines, Virus du SRAS (génétique), Virus du SRAS (physiologie).
- MESH :
- analyse : Protéines de fusion virale.
- génétique : Glycoprotéines membranaires, Protéines de l'enveloppe virale, Virus du SRAS.
- métabolisme : Glycoprotéines membranaires, Protéines de l'enveloppe virale.
- physiologie : Glycoprotéines membranaires, Protéines de l'enveloppe virale, Virus du SRAS.
- Animaux, Cellules Vero, Données de séquences moléculaires, Délétion de séquence, Fusion cellulaire, Fusion membranaire, Glycoprotéine de spicule des coronavirus, Glycoprotéines membranaires, Immunohistochimie, Membrane cellulaire, Mutation ponctuelle, Protéines de l'enveloppe virale, Structure tertiaire des protéines, Substitution d'acide aminé, Séquence d'acides aminés, Transport de protéines.
English descriptors
- KwdEn :
- Amino Acid Sequence, Amino Acid Substitution, Animals, Cell Fusion, Cell Membrane (chemistry), Chlorocebus aethiops, Immunohistochemistry, Membrane Fusion, Membrane Glycoproteins (chemistry), Membrane Glycoproteins (genetics), Membrane Glycoproteins (metabolism), Membrane Glycoproteins (physiology), Molecular Sequence Data, Point Mutation, Protein Structure, Tertiary, Protein Transport, SARS Virus (genetics), SARS Virus (physiology), Sequence Deletion, Spike Glycoprotein, Coronavirus, Vero Cells, Viral Envelope Proteins (chemistry), Viral Envelope Proteins (genetics), Viral Envelope Proteins (metabolism), Viral Envelope Proteins (physiology), Viral Fusion Proteins (analysis).
- MESH :
- chemical , analysis : Viral Fusion Proteins.
- chemical , chemistry : Membrane Glycoproteins, Viral Envelope Proteins.
- chemistry : Cell Membrane.
- chemical , genetics : Membrane Glycoproteins, SARS Virus, Viral Envelope Proteins.
- chemical , metabolism : Membrane Glycoproteins, Viral Envelope Proteins.
- chemical , physiology : Membrane Glycoproteins, SARS Virus, Viral Envelope Proteins.
- Amino Acid Sequence, Amino Acid Substitution, Animals, Cell Fusion, Chlorocebus aethiops, Immunohistochemistry, Membrane Fusion, Molecular Sequence Data, Point Mutation, Protein Structure, Tertiary, Protein Transport, Sequence Deletion, Spike Glycoprotein, Coronavirus, Vero Cells.
Abstract
The SARS-coronavirus (SARS-CoV) is the etiological agent of severe acute respiratory syndrome (SARS). The SARS-CoV spike (S) glycoprotein mediates membrane fusion events during virus entry and virus-induced cell-to-cell fusion. To delineate functional domains of the SARS-CoV S glycoprotein, single point mutations, cluster-to-lysine and cluster-to-alanine mutations, as well as carboxyl-terminal truncations were investigated in transient expression experiments. Mutagenesis of either the coiled-coil domain of the S glycoprotein amino terminal heptad repeat, the predicted fusion peptide, or an adjacent but distinct region, severely compromised S-mediated cell-to-cell fusion, while intracellular transport and cell-surface expression were not adversely affected. Surprisingly, a carboxyl-terminal truncation of 17 amino acids substantially increased S glycoprotein-mediated cell-to-cell fusion suggesting that the terminal 17 amino acids regulated the S fusogenic properties. In contrast, truncation of 26 or 39 amino acids eliminating either one or both of the two endodomain cysteine-rich motifs, respectively, inhibited cell fusion in comparison to the wild-type S. The 17 and 26 amino-acid deletions did not adversely affect S cell-surface expression, while the 39 amino-acid truncation inhibited S cell-surface expression suggesting that the membrane proximal cysteine-rich motif plays an essential role in S cell-surface expression. Mutagenesis of the acidic amino-acid cluster in the carboxyl terminus of the S glycoprotein as well as modification of a predicted phosphorylation site within the acidic cluster revealed that this amino-acid motif may play a functional role in the retention of S at cell surfaces. This genetic analysis reveals that the SARS-CoV S glycoprotein contains extracellular domains that regulate cell fusion as well as distinct endodomains that function in intracellular transport, cell-surface expression, and cell fusion.
DOI: 10.1016/j.virol.2005.06.046
PubMed: 16099010
Affiliations:
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Melancon</name></author><author><name sortKey="Chouljenko, Vladimir N" sort="Chouljenko, Vladimir N" uniqKey="Chouljenko V" first="Vladimir N" last="Chouljenko">Vladimir N. Chouljenko</name></author><author><name sortKey="Colgrove, Robin" sort="Colgrove, Robin" uniqKey="Colgrove R" first="Robin" last="Colgrove">Robin Colgrove</name></author><author><name sortKey="Farzan, Michael" sort="Farzan, Michael" uniqKey="Farzan M" first="Michael" last="Farzan">Michael Farzan</name></author><author><name sortKey="Knipe, David M" sort="Knipe, David M" uniqKey="Knipe D" first="David M" last="Knipe">David M. 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Petit</name><affiliation wicri:level="2"><nlm:affiliation>Division of Biotechnology and Molecular Medicine (BIOMMED), School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Division of Biotechnology and Molecular Medicine (BIOMMED), School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803</wicri:regionArea><placeName><region type="state">Louisiane</region></placeName></affiliation></author><author><name sortKey="Melancon, Jeffrey M" sort="Melancon, Jeffrey M" uniqKey="Melancon J" first="Jeffrey M" last="Melancon">Jeffrey M. Melancon</name></author><author><name sortKey="Chouljenko, Vladimir N" sort="Chouljenko, Vladimir N" uniqKey="Chouljenko V" first="Vladimir N" last="Chouljenko">Vladimir N. Chouljenko</name></author><author><name sortKey="Colgrove, Robin" sort="Colgrove, Robin" uniqKey="Colgrove R" first="Robin" last="Colgrove">Robin Colgrove</name></author><author><name sortKey="Farzan, Michael" sort="Farzan, Michael" uniqKey="Farzan M" first="Michael" last="Farzan">Michael Farzan</name></author><author><name sortKey="Knipe, David M" sort="Knipe, David M" uniqKey="Knipe D" first="David M" last="Knipe">David M. Knipe</name></author><author><name sortKey="Kousoulas, K G" sort="Kousoulas, K G" uniqKey="Kousoulas K" first="K G" last="Kousoulas">K G Kousoulas</name></author></analytic><series><title level="j">Virology</title><idno type="ISSN">0042-6822</idno><imprint><date when="2005" type="published">2005</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Amino Acid Sequence</term><term>Amino Acid Substitution</term><term>Animals</term><term>Cell Fusion</term><term>Cell Membrane (chemistry)</term><term>Chlorocebus aethiops</term><term>Immunohistochemistry</term><term>Membrane Fusion</term><term>Membrane Glycoproteins (chemistry)</term><term>Membrane Glycoproteins (genetics)</term><term>Membrane Glycoproteins (metabolism)</term><term>Membrane Glycoproteins (physiology)</term><term>Molecular Sequence Data</term><term>Point Mutation</term><term>Protein Structure, Tertiary</term><term>Protein Transport</term><term>SARS Virus (genetics)</term><term>SARS Virus (physiology)</term><term>Sequence Deletion</term><term>Spike Glycoprotein, Coronavirus</term><term>Vero Cells</term><term>Viral Envelope Proteins (chemistry)</term><term>Viral Envelope Proteins (genetics)</term><term>Viral Envelope Proteins (metabolism)</term><term>Viral Envelope Proteins (physiology)</term><term>Viral Fusion Proteins (analysis)</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Animaux</term><term>Cellules Vero</term><term>Données de séquences moléculaires</term><term>Délétion de séquence</term><term>Fusion cellulaire</term><term>Fusion membranaire</term><term>Glycoprotéine de spicule des coronavirus</term><term>Glycoprotéines membranaires ()</term><term>Glycoprotéines membranaires (génétique)</term><term>Glycoprotéines membranaires (métabolisme)</term><term>Glycoprotéines membranaires (physiologie)</term><term>Immunohistochimie</term><term>Membrane cellulaire ()</term><term>Mutation ponctuelle</term><term>Protéines de fusion virale (analyse)</term><term>Protéines de l'enveloppe virale ()</term><term>Protéines de l'enveloppe virale (génétique)</term><term>Protéines de l'enveloppe virale (métabolisme)</term><term>Protéines de l'enveloppe virale (physiologie)</term><term>Structure tertiaire des protéines</term><term>Substitution d'acide aminé</term><term>Séquence d'acides aminés</term><term>Transport de protéines</term><term>Virus du SRAS (génétique)</term><term>Virus du SRAS (physiologie)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="analysis" xml:lang="en"><term>Viral Fusion Proteins</term></keywords><keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Membrane Glycoproteins</term><term>Viral Envelope Proteins</term></keywords><keywords scheme="MESH" qualifier="analyse" xml:lang="fr"><term>Protéines de fusion virale</term></keywords><keywords scheme="MESH" qualifier="chemistry" xml:lang="en"><term>Cell Membrane</term></keywords><keywords scheme="MESH" type="chemical" qualifier="genetics" xml:lang="en"><term>Membrane Glycoproteins</term><term>SARS Virus</term><term>Viral Envelope Proteins</term></keywords><keywords scheme="MESH" qualifier="génétique" xml:lang="fr"><term>Glycoprotéines membranaires</term><term>Protéines de l'enveloppe virale</term><term>Virus du SRAS</term></keywords><keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Membrane Glycoproteins</term><term>Viral Envelope Proteins</term></keywords><keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Glycoprotéines membranaires</term><term>Protéines de l'enveloppe virale</term></keywords><keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Glycoprotéines membranaires</term><term>Protéines de l'enveloppe virale</term><term>Virus du SRAS</term></keywords><keywords scheme="MESH" type="chemical" qualifier="physiology" xml:lang="en"><term>Membrane Glycoproteins</term><term>SARS Virus</term><term>Viral Envelope Proteins</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Amino Acid Sequence</term><term>Amino Acid Substitution</term><term>Animals</term><term>Cell Fusion</term><term>Chlorocebus aethiops</term><term>Immunohistochemistry</term><term>Membrane Fusion</term><term>Molecular Sequence Data</term><term>Point Mutation</term><term>Protein Structure, Tertiary</term><term>Protein Transport</term><term>Sequence Deletion</term><term>Spike Glycoprotein, Coronavirus</term><term>Vero Cells</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Animaux</term><term>Cellules Vero</term><term>Données de séquences moléculaires</term><term>Délétion de séquence</term><term>Fusion cellulaire</term><term>Fusion membranaire</term><term>Glycoprotéine de spicule des coronavirus</term><term>Glycoprotéines membranaires</term><term>Immunohistochimie</term><term>Membrane cellulaire</term><term>Mutation ponctuelle</term><term>Protéines de l'enveloppe virale</term><term>Structure tertiaire des protéines</term><term>Substitution d'acide aminé</term><term>Séquence d'acides aminés</term><term>Transport de protéines</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The SARS-coronavirus (SARS-CoV) is the etiological agent of severe acute respiratory syndrome (SARS). The SARS-CoV spike (S) glycoprotein mediates membrane fusion events during virus entry and virus-induced cell-to-cell fusion. To delineate functional domains of the SARS-CoV S glycoprotein, single point mutations, cluster-to-lysine and cluster-to-alanine mutations, as well as carboxyl-terminal truncations were investigated in transient expression experiments. Mutagenesis of either the coiled-coil domain of the S glycoprotein amino terminal heptad repeat, the predicted fusion peptide, or an adjacent but distinct region, severely compromised S-mediated cell-to-cell fusion, while intracellular transport and cell-surface expression were not adversely affected. Surprisingly, a carboxyl-terminal truncation of 17 amino acids substantially increased S glycoprotein-mediated cell-to-cell fusion suggesting that the terminal 17 amino acids regulated the S fusogenic properties. In contrast, truncation of 26 or 39 amino acids eliminating either one or both of the two endodomain cysteine-rich motifs, respectively, inhibited cell fusion in comparison to the wild-type S. The 17 and 26 amino-acid deletions did not adversely affect S cell-surface expression, while the 39 amino-acid truncation inhibited S cell-surface expression suggesting that the membrane proximal cysteine-rich motif plays an essential role in S cell-surface expression. Mutagenesis of the acidic amino-acid cluster in the carboxyl terminus of the S glycoprotein as well as modification of a predicted phosphorylation site within the acidic cluster revealed that this amino-acid motif may play a functional role in the retention of S at cell surfaces. This genetic analysis reveals that the SARS-CoV S glycoprotein contains extracellular domains that regulate cell fusion as well as distinct endodomains that function in intracellular transport, cell-surface expression, and cell fusion.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Louisiane</li></region></list><tree><noCountry><name sortKey="Chouljenko, Vladimir N" sort="Chouljenko, Vladimir N" uniqKey="Chouljenko V" first="Vladimir N" last="Chouljenko">Vladimir N. Chouljenko</name><name sortKey="Colgrove, Robin" sort="Colgrove, Robin" uniqKey="Colgrove R" first="Robin" last="Colgrove">Robin Colgrove</name><name sortKey="Farzan, Michael" sort="Farzan, Michael" uniqKey="Farzan M" first="Michael" last="Farzan">Michael Farzan</name><name sortKey="Knipe, David M" sort="Knipe, David M" uniqKey="Knipe D" first="David M" last="Knipe">David M. Knipe</name><name sortKey="Kousoulas, K G" sort="Kousoulas, K G" uniqKey="Kousoulas K" first="K G" last="Kousoulas">K G Kousoulas</name><name sortKey="Melancon, Jeffrey M" sort="Melancon, Jeffrey M" uniqKey="Melancon J" first="Jeffrey M" last="Melancon">Jeffrey M. Melancon</name></noCountry><country name="États-Unis"><region name="Louisiane"><name sortKey="Petit, Chad M" sort="Petit, Chad M" uniqKey="Petit C" first="Chad M" last="Petit">Chad M. Petit</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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