Int. J. Mol. Sci. 2013, 14(3), 4525-4544; doi:10.3390/ijms14034525
Article

Molecular Analysis of RNA-RNA Interactions between 5’ and 3’ Untranslated Regions during the Initiation of Translation of a Cardiovirulent and a Live-Attenuated Coxsackievirus B3 Strains

1 Laboratoire des Maladies Transmissibles et Substances Biologiquement Actives (LR99-ES27), Faculté de Pharmacie de Monastir, Avenue Avicenne, Monastir 5000, Tunisia 2 Institut Supérieur de Biotechnologie de Monastir, Université de Monastir, Avenue Tahar Hadded, BP 74, Monastir 5000, Tunisia
* Author to whom correspondence should be addressed.
Received: 23 January 2013; in revised form: 16 February 2013 / Accepted: 20 February 2013 / Published: 25 February 2013
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Abstract: Coxsackievirus B3 (CVB3) is a causative agent of viral myocarditis, meningitis and pancreatitis. CVB3 overcome their host cells by usurping the translation machinery to benefit viral gene expression. This is accomplished through alternative translation initiation in a cap independent manner at the viral internal ribosomal entry site. The 5’ untranslated region (5’UTR) of CVB3 genomic RNA is highly structured. It is the site of multiple RNA-protein and RNA-RNA interactions and it plays a critical role during translation initiation. Similar to the 5’UTR, CVB3 3’ untranslated region (3’UTR) also contains secondary structural elements consisting of three stem-loops followed by a poly (A) tail sequence. Long-range RNA-RNA interactions between 5’ and 3’ ends of some viral genomes have been observed. Because of their dual role in translation and replication, the 5’ and 3’UTRs represent promising candidates for the study of CVB3 cardiovirulence. Taking into account that efficient initiation of mRNA translation depends on a temporally and spatially orchestrated sequence of protein-protein, protein-RNA and RNA-RNA interactions, and that, at present, little is known about RNA-RNA interactions between CVB3 5’ and 3’UTRs, we aimed in the present study, to assess a possible RNA-RNA interaction between 5’ and 3’UTRs during the initiation of translation of a wild-type and a previously characterized mutant (Sabin3-like) CVB3 strains and to investigate the effect of the Sabin3-like mutation on these potential interactions. For this purpose, “Electrophoretic Mobility Shift” assays were carried out. Data obtained did not show any RNA-RNA direct interactions between the 5’- and 3’- ends. Therefore, we can suggest that the possible mechanism by which 3’UTR enhances CVB3 IRES activity may be by bridging the 5’ to the 3’ end through RNA-protein interaction and not through RNA-RNA direct contact. However, these findings need to be confirmed by carrying out further experiments.
Keywords: CVB3; 5’UTR; 3’UTR; RNA-RNA interaction; electrophoretic mobility shift assay

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MDPI and ACS Style

Souii, A.; Gharbi, J.; M'hadheb-Gharbi, M.B. Molecular Analysis of RNA-RNA Interactions between 5’ and 3’ Untranslated Regions during the Initiation of Translation of a Cardiovirulent and a Live-Attenuated Coxsackievirus B3 Strains. Int. J. Mol. Sci. 2013, 14, 4525-4544.

AMA Style

Souii A, Gharbi J, M'hadheb-Gharbi MB. Molecular Analysis of RNA-RNA Interactions between 5’ and 3’ Untranslated Regions during the Initiation of Translation of a Cardiovirulent and a Live-Attenuated Coxsackievirus B3 Strains. International Journal of Molecular Sciences. 2013; 14(3):4525-4544.

Chicago/Turabian Style

Souii, Amira; Gharbi, Jawhar; M'hadheb-Gharbi, Manel B. 2013. "Molecular Analysis of RNA-RNA Interactions between 5’ and 3’ Untranslated Regions during the Initiation of Translation of a Cardiovirulent and a Live-Attenuated Coxsackievirus B3 Strains." Int. J. Mol. Sci. 14, no. 3: 4525-4544.

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