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. 1996 Mar;70(3):1467–1474. doi: 10.1128/jvi.70.3.1467-1474.1996

Attenuation stem-loop lesions in the 5' noncoding region of poliovirus RNA: neuronal cell-specific translation defects.

A A Haller 1, S R Stewart 1, B L Semler 1
PMCID: PMC189967  PMID: 8627664

Abstract

The nucleotide at position 480 in the 5' noncoding region of the viral RNA genome plays an important role in directing the attenuation phenotype of the Sabin vaccine strain of poliovirus type 1. In vitro translation studies have shown that the attenuated viral genomes of the Sabin strains direct levels of viral protein synthesis lower than those of their neurovirulent counterparts. We previously described the isolation of pseudorevertant polioviruses derived from transfections of HeLa cells with genome-length RNA harboring an eight-nucleotide lesion in a stem-loop structure (stem-loop V) that contains the attenuation determinant at position 480 (A. A. Haller and B. L. Semler, J. Virol. 66:5075-5086, 1992). This stem-loop structure is a major component of the poliovirus internal ribosome entry site required for initiation of viral protein synthesis. The eight-nucleotide lesion (X472) was lethal for virus growth and gave rise only to viruses which had partially reverted nucleotides within the original substituted sequences. In this study, we analyzed two of the poliovirus revertants (X472RI and X472R2) for cell-type-specific growth properties. The X472RI and X472R2 RNA templates directed protein synthesis to wild-type levels in in vitro translation reaction mixtures supplemented with crude cytoplasmic HeLa cell extracts. In contrast, the same X472 revertant RNAs displayed a decreased translation initiation efficiency when translated in a cell-free system supplemented with extracts from neuronal cells. This translation initiation defect of the X472R templates correlated with reduced yields of infectious virus particles in neuronal cells compared with those obtained from HeLa cells infected with the X472 poliovirus revertants. Our results underscore the important of RNA secondary structures within the poliovirus internal ribosome entry site in directing translation initiation and suggest that such structures interact with neuronal cell factors in a specific manner.

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Selected References

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