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J. Virol., 01 1998, 520-526, Vol 72, No. 1
Copyright © 1998, American Society for Microbiology

The product of the respiratory syncytial virus M2 gene ORF1 enhances readthrough of intergenic junctions during viral transcription

RW Hardy and GW Wertz
Department of Microbiology, University of Alabama School of Medicine at Birmingham, 35294, USA.

The mRNA encoding the M2 protein of respiratory syncytial (RS) virus contains two open reading frames (ORFs). ORF1 encodes the 22-kDa structural protein, M2, and ORF2 has the potential to encode a 10-kDa protein (90 amino acids). Using a vaccinia virus T7 expression system, we examined the RNA synthetic activities of mono- and dicistronic subgenomic replicons of RS virus by direct metabolic labeling of RNA in the presence and absence of the products of ORF1 and ORF2. In the absence of ORF1 and ORF2, the negative- and positive-sense products of genomic RNA replication and positive-sense polyadenylated mRNA(s) were synthesized. Expression of the whole M2 transcription unit (containing ORF1 and ORF2) or ORF1 alone caused an increase in the synthesis of polyadenylated mRNA, the majority of which was due to a substantial increase in the quantity of polycistronic mRNAs generated by the polymerase failing to terminate at gene end signals. In agreement with previous reports, the ORF2 product was found to inhibit viral RNA replication and mRNA transcription. These data show that the M2 protein functions as a transcriptional antiterminator that enhances the ability of the viral RNA polymerase to read through intergenic junctions. The role of such a function during the viral life cycle is discussed.


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