The PDZ-Binding Motif of Severe Acute Respiratory Syndrome Coronavirus Envelope Protein Is a Determinant of Viral Pathogenesis
SARS-CoV caused a worldwide epidemic infecting 8000 people with a mortality of about 10%. A recombinant SARS-CoV lacking the E protein was attenuated in vivo. The E protein contains a PDZ-binding motif (PBM), a domain potentially involved in the interaction with more than 400 cellular proteins, which highlights its relevance in modulating host-cell behavior. To analyze the contributions of this motif to virulence, recombinant viruses with or without E protein PBM were generated. Recombinant SARS-CoVs lacking E protein PBM caused minimal lung damage and were attenuated, in contrast to viruses containing this motif, indicating that E protein PBM is a virulence determinant. E protein PBM induces the deleterious exacerbated immune response triggered during SARS-CoV infection, and interacts with the cellular protein syntenin, as demonstrated using proteomic analyses. Interestingly, syntenin redistributed from nucleus to cytoplasm during SARS-CoV infection, activating p38 MAPK and triggering the overexpression of inflammatory cytokines. Furthermore, silencing of syntenin using siRNAs led to a decrease in p38 MAPK activation. In addition, administration of a p38 MAPK inhibitor led to an increase in mice survival after SARS-CoV infection. These results indicate that syntenin and p38 MAPK are potential therapeutic targets to reduce the exacerbated immune response during SARS-CoV infection.
Vyšlo v časopise:
The PDZ-Binding Motif of Severe Acute Respiratory Syndrome Coronavirus Envelope Protein Is a Determinant of Viral Pathogenesis. PLoS Pathog 10(8): e32767. doi:10.1371/journal.ppat.1004320
Kategorie:
Research Article
prolekare.web.journal.doi_sk:
https://doi.org/10.1371/journal.ppat.1004320
Souhrn
SARS-CoV caused a worldwide epidemic infecting 8000 people with a mortality of about 10%. A recombinant SARS-CoV lacking the E protein was attenuated in vivo. The E protein contains a PDZ-binding motif (PBM), a domain potentially involved in the interaction with more than 400 cellular proteins, which highlights its relevance in modulating host-cell behavior. To analyze the contributions of this motif to virulence, recombinant viruses with or without E protein PBM were generated. Recombinant SARS-CoVs lacking E protein PBM caused minimal lung damage and were attenuated, in contrast to viruses containing this motif, indicating that E protein PBM is a virulence determinant. E protein PBM induces the deleterious exacerbated immune response triggered during SARS-CoV infection, and interacts with the cellular protein syntenin, as demonstrated using proteomic analyses. Interestingly, syntenin redistributed from nucleus to cytoplasm during SARS-CoV infection, activating p38 MAPK and triggering the overexpression of inflammatory cytokines. Furthermore, silencing of syntenin using siRNAs led to a decrease in p38 MAPK activation. In addition, administration of a p38 MAPK inhibitor led to an increase in mice survival after SARS-CoV infection. These results indicate that syntenin and p38 MAPK are potential therapeutic targets to reduce the exacerbated immune response during SARS-CoV infection.
Zdroje
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Hygiena a epidemiológia Infekčné lekárstvo LaboratóriumČlánok vyšiel v časopise
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