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RNA dimerization plays a role in ribosomal frameshifting of the SARS coronavirus

Identifieur interne : 001C78 ( Main/Exploration ); précédent : 001C77; suivant : 001C79

RNA dimerization plays a role in ribosomal frameshifting of the SARS coronavirus

Auteurs : Daniella Ishimaru [États-Unis] ; Ewan P. Plant [États-Unis] ; Amy C. Sims [États-Unis] ; Boyd L. Yount [États-Unis] ; Braden M. Roth [États-Unis] ; Nadukkudy V. Eldho [États-Unis] ; Gabriela C. Pérez-Alvarado [États-Unis] ; David W. Armbruster [États-Unis] ; Ralph S. Baric [États-Unis] ; Jonathan D. Dinman [États-Unis] ; Deborah R. Taylor [États-Unis] ; Mirko Hennig [États-Unis]

Source :

RBID : PMC:3575852

Descripteurs français

English descriptors

Abstract

Messenger RNA encoded signals that are involved in programmed -1 ribosomal frameshifting (-1 PRF) are typically two-stemmed hairpin (H)-type pseudoknots (pks). We previously described an unusual three-stemmed pseudoknot from the severe acute respiratory syndrome (SARS) coronavirus (CoV) that stimulated -1 PRF. The conserved existence of a third stem–loop suggested an important hitherto unknown function. Here we present new information describing structure and function of the third stem of the SARS pseudoknot. We uncovered RNA dimerization through a palindromic sequence embedded in the SARS-CoV Stem 3. Further in vitro analysis revealed that SARS-CoV RNA dimers assemble through ‘kissing’ loop–loop interactions. We also show that loop–loop kissing complex formation becomes more efficient at physiological temperature and in the presence of magnesium. When the palindromic sequence was mutated, in vitro RNA dimerization was abolished, and frameshifting was reduced from 15 to 5.7%. Furthermore, the inability to dimerize caused by the silent codon change in Stem 3 of SARS-CoV changed the viral growth kinetics and affected the levels of genomic and subgenomic RNA in infected cells. These results suggest that the homodimeric RNA complex formed by the SARS pseudoknot occurs in the cellular environment and that loop–loop kissing interactions involving Stem 3 modulate -1 PRF and play a role in subgenomic and full-length RNA synthesis.


Url:
DOI: 10.1093/nar/gks1361
PubMed: 23275571
PubMed Central: 3575852


Affiliations:


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Le document en format XML

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<term>Base Sequence</term>
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<term>Conserved Sequence</term>
<term>Dimerization</term>
<term>Frameshifting, Ribosomal</term>
<term>Inverted Repeat Sequences</term>
<term>Kinetics</term>
<term>Magnesium (chemistry)</term>
<term>Microbial Viability</term>
<term>Molecular Sequence Data</term>
<term>Mutation</term>
<term>Nuclear Magnetic Resonance, Biomolecular</term>
<term>Nucleic Acid Conformation</term>
<term>RNA, Viral (chemistry)</term>
<term>SARS Virus (genetics)</term>
<term>Temperature</term>
</keywords>
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<term>ARN viral ()</term>
<term>Cinétique</term>
<term>Codon</term>
<term>Conformation d'acide nucléique</term>
<term>Dimérisation</term>
<term>Données de séquences moléculaires</term>
<term>Décalage ribosomique du cadre de lecture</term>
<term>Magnésium ()</term>
<term>Mutation</term>
<term>Résonance magnétique nucléaire biomoléculaire</term>
<term>Séquence conservée</term>
<term>Séquence nucléotidique</term>
<term>Séquences répétées inversées</term>
<term>Température</term>
<term>Viabilité microbienne</term>
<term>Virus du SRAS (génétique)</term>
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<term>Conserved Sequence</term>
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<term>Cinétique</term>
<term>Codon</term>
<term>Conformation d'acide nucléique</term>
<term>Dimérisation</term>
<term>Données de séquences moléculaires</term>
<term>Décalage ribosomique du cadre de lecture</term>
<term>Magnésium</term>
<term>Mutation</term>
<term>Résonance magnétique nucléaire biomoléculaire</term>
<term>Séquence conservée</term>
<term>Séquence nucléotidique</term>
<term>Séquences répétées inversées</term>
<term>Température</term>
<term>Viabilité microbienne</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front>
<div type="abstract" xml:lang="en">
<p>Messenger RNA encoded signals that are involved in programmed -1 ribosomal frameshifting (-1 PRF) are typically two-stemmed hairpin (H)-type pseudoknots (pks). We previously described an unusual three-stemmed pseudoknot from the severe acute respiratory syndrome (SARS) coronavirus (CoV) that stimulated -1 PRF. The conserved existence of a third stem–loop suggested an important hitherto unknown function. Here we present new information describing structure and function of the third stem of the SARS pseudoknot. We uncovered RNA dimerization through a palindromic sequence embedded in the SARS-CoV Stem 3. Further
<italic>in vitro</italic>
analysis revealed that SARS-CoV RNA dimers assemble through ‘kissing’ loop–loop interactions. We also show that loop–loop kissing complex formation becomes more efficient at physiological temperature and in the presence of magnesium. When the palindromic sequence was mutated,
<italic>in vitro</italic>
RNA dimerization was abolished, and frameshifting was reduced from 15 to 5.7%. Furthermore, the inability to dimerize caused by the silent codon change in Stem 3 of SARS-CoV changed the viral growth kinetics and affected the levels of genomic and subgenomic RNA in infected cells. These results suggest that the homodimeric RNA complex formed by the SARS pseudoknot occurs in the cellular environment and that loop–loop kissing interactions involving Stem 3 modulate -1 PRF and play a role in subgenomic and full-length RNA synthesis.</p>
</div>
</front>
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