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Interference of ribosomal frameshifting by antisense peptide nucleic acids suppresses SARS coronavirus replication.

Identifieur interne : 001473 ( PubMed/Checkpoint ); précédent : 001472; suivant : 001474

Interference of ribosomal frameshifting by antisense peptide nucleic acids suppresses SARS coronavirus replication.

Auteurs : Dae-Gyun Ahn [Corée du Sud] ; Wooseong Lee ; Jin-Kyu Choi ; Seong-Jun Kim ; Ewan P. Plant ; Fernando Almazán ; Deborah R. Taylor ; Luis Enjuanes ; Jong-Won Oh

Source :

RBID : pubmed:21549154

Descripteurs français

English descriptors

Abstract

The programmed -1 ribosomal frameshifting (-1 PRF) utilized by eukaryotic RNA viruses plays a crucial role for the controlled, limited synthesis of viral RNA replicase polyproteins required for genome replication. The viral RNA replicase polyproteins of severe acute respiratory syndrome coronavirus (SARS-CoV) are encoded by the two overlapping open reading frames 1a and 1b, which are connected by a -1 PRF signal. We evaluated the antiviral effects of antisense peptide nucleic acids (PNAs) targeting a highly conserved RNA sequence on the - PRF signal. The ribosomal frameshifting was inhibited by the PNA, which bound sequence-specifically a pseudoknot structure in the -1 PRF signal, in cell lines as assessed using a dual luciferase-based reporter plasmid containing the -1 PRF signal. Treatment of cells, which were transfected with a SARS-CoV-replicon expressing firefly luciferase, with the PNA fused to a cell-penetrating peptide (CPP) resulted in suppression of the replication of the SARS-CoV replicon, with a 50% inhibitory concentration of 4.4μM. There was no induction of type I interferon responses by PNA treatment, suggesting that the effect of PNA is not due to innate immune responses. Our results demonstrate that -1 PRF, critical for SARS-CoV viral replication, can be inhibited by CPP-PNA, providing an effective antisense strategy for blocking -1 PRF signals.

DOI: 10.1016/j.antiviral.2011.04.009
PubMed: 21549154


Affiliations:


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pubmed:21549154

Le document en format XML

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<front>
<div type="abstract" xml:lang="en">The programmed -1 ribosomal frameshifting (-1 PRF) utilized by eukaryotic RNA viruses plays a crucial role for the controlled, limited synthesis of viral RNA replicase polyproteins required for genome replication. The viral RNA replicase polyproteins of severe acute respiratory syndrome coronavirus (SARS-CoV) are encoded by the two overlapping open reading frames 1a and 1b, which are connected by a -1 PRF signal. We evaluated the antiviral effects of antisense peptide nucleic acids (PNAs) targeting a highly conserved RNA sequence on the - PRF signal. The ribosomal frameshifting was inhibited by the PNA, which bound sequence-specifically a pseudoknot structure in the -1 PRF signal, in cell lines as assessed using a dual luciferase-based reporter plasmid containing the -1 PRF signal. Treatment of cells, which were transfected with a SARS-CoV-replicon expressing firefly luciferase, with the PNA fused to a cell-penetrating peptide (CPP) resulted in suppression of the replication of the SARS-CoV replicon, with a 50% inhibitory concentration of 4.4μM. There was no induction of type I interferon responses by PNA treatment, suggesting that the effect of PNA is not due to innate immune responses. Our results demonstrate that -1 PRF, critical for SARS-CoV viral replication, can be inhibited by CPP-PNA, providing an effective antisense strategy for blocking -1 PRF signals.</div>
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