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. 1995 Dec;69(12):7835–7844. doi: 10.1128/jvi.69.12.7835-7844.1995

The 3' untranslated region of picornavirus RNA: features required for efficient genome replication.

J B Rohll 1, D H Moon 1, D J Evans 1, J W Almond 1
PMCID: PMC189727  PMID: 7494295

Abstract

The role of the 3' untranslated region (3'UTR) in the replication of enteroviruses has been studied with a series of mutants derived from either poliovirus type 3 (PV3) or a PV3 replicon containing the reporter gene chloramphenicol acetyltransferase. Replication was observed when the PV3 3'UTR was replaced with that of either coxsackie B4 virus, human rhinovirus 14 (HRV14), bovine enterovirus, or hepatitis A virus, despite the lack of sequence and secondary structure homology of the 3'UTRs of these viruses. The levels of replication observed for recombinants containing the 3'UTRs of hepatitis A virus and bovine enterovirus were lower than those for PV3 and the other recombinants. Extensive site-directed mutagenesis of the single stem-loop structure formed by the HRV14 3'UTR indicated the importance of (i) the loop sequence, (ii) the stability of the stem, and (iii) the location of the stem immediately upstream of the poly(A) tail. The role of a 4-bp motif at the base of the HRV14 stem, highly conserved among rhinoviruses, was examined by site-directed mutagenesis of individual base pairs. This analysis did not pinpoint a particular base pair as crucial for function. The requirement for immediate adjacent positioning of the open reading frame and the 3'UTR was examined by insertion of a 1.1-kb heterologous sequence. A replicon containing this insert replicated to about 30% of the level observed for the wild type. However, the corresponding virus consistently deleted most of the inserted fragment, suggesting that its presence was incompatible with a full replication cycle.

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Selected References

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