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Sequences within the poliovirus internal ribosome entry segment control viral RNA synthesis.

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Affiliations

  • 1. Unité d'Oncologie Virale (INSERM URA 1157), Paris, France.
      Authors
    • Borman AM 1
    (1 author)

ORCIDs linked to this article

The EMBO Journal, 01 Jul 1994, 13(13):3149-3157
https://doi.org/10.1002/j.1460-2075.1994.tb06613.x PMID: 8039507 PMCID: PMC395206

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Abstract 

The 5' untranslated region of poliovirus RNA has been reported to possess two functional elements: (i) the 5' proximal 88 nucleotides form a cloverleaf structure implicated in positive-strand RNA synthesis during viral replication, and (ii) nucleotides 134 to at least 556 function as a highly structured internal ribosome entry segment (IRES) during cap-independent, internal initiation of translation. We show here that the IRES itself is bifunctional and contains sequences necessary for viral RNA synthesis per se. For this purpose, we used a dicistronic poliovirus RNA in which the translation of the viral non-structural (replication) proteins is uncoupled from the poliovirus IRES. In this system, RNA synthesis is readily detectable in transfected cells, even when the poliovirus IRES is inactivated by point mutation. However, deletion of the major part of the poliovirus IRES renders viral-specific RNA synthesis undetectable. Using the same system, we show that a three nucleotide deletion at position 500 in the 5' untranslated region drastically affects both translation efficiency and RNA synthesis. Furthermore, disruption of the secondary structure of the IRES around nucleotide 343 has minimal effects on IRES function, but dramatically reduces viral RNA replication. Taken together, these results provide direct evidence that sequences essential for viral RNA synthesis are located in the 3' region of the poliovirus IRES.

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Logo of embojLink to Publisher's site
EMBO J. 1994 Jul 1; 13(13): 3149–3157.
PMCID: PMC395206
PMID: 8039507

Sequences within the poliovirus internal ribosome entry segment control viral RNA synthesis.

A M Borman, F G Deliat, and K M Kean
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Abstract

The 5' untranslated region of poliovirus RNA has been reported to possess two functional elements: (i) the 5' proximal 88 nucleotides form a cloverleaf structure implicated in positive-strand RNA synthesis during viral replication, and (ii) nucleotides 134 to at least 556 function as a highly structured internal ribosome entry segment (IRES) during cap-independent, internal initiation of translation. We show here that the IRES itself is bifunctional and contains sequences necessary for viral RNA synthesis per se. For this purpose, we used a dicistronic poliovirus RNA in which the translation of the viral non-structural (replication) proteins is uncoupled from the poliovirus IRES. In this system, RNA synthesis is readily detectable in transfected cells, even when the poliovirus IRES is inactivated by point mutation. However, deletion of the major part of the poliovirus IRES renders viral-specific RNA synthesis undetectable. Using the same system, we show that a three nucleotide deletion at position 500 in the 5' untranslated region drastically affects both translation efficiency and RNA synthesis. Furthermore, disruption of the secondary structure of the IRES around nucleotide 343 has minimal effects on IRES function, but dramatically reduces viral RNA replication. Taken together, these results provide direct evidence that sequences essential for viral RNA synthesis are located in the 3' region of the poliovirus IRES.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
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