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Journal of Virology, January 1999, p. 170-176, Vol. 73, No. 1
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Diverse Gene Junctions of Respiratory Syncytial Virus
Modulate the Efficiency of Transcription Termination and
Respond Differently to M2-Mediated Antitermination
Richard W.
Hardy,
Shawn B.
Harmon, and
Gail W.
Wertz*
Department of Microbiology, University of
Alabama at Birmingham, Birmingham, Alabama 35294
Received 7 August 1998/Accepted 23 September 1998
The ability of the diverse gene junctions of respiratory syncytial
(RS) virus to signal the termination of transcription was analyzed.
Nine dicistronic subgenomic replicons of RS virus were constructed;
each contained one of the RS virus gene junctions in its natural
upstream and downstream sequence context. The RNA synthesis activities
of these subgenomic replicons were analyzed in the absence and presence
of the M2 protein, which we showed previously to function as a
transcription antiterminator. Our data showed that the efficiency with
which the polymerase terminated transcription was affected by the gene
junction that it encountered. The M2 protein significantly decreased
the efficiency of the termination of transcription, resulting in
increased levels of readthrough transcription at all the gene
junctions. The diverse gene junctions fell into three broad groups with
respect to their ability to signal transcription termination. One group
of gene junctions (NS1/NS2, NS2/N, M2/L, and L/trailer) showed
inefficient termination in the absence or the presence of the M2
protein. A second group of gene junctions (N/P, P/M, M/SH, SH/G, and
G/F) terminated transcription efficiently. The SH/G gene junction
terminated transcription with the greatest efficiency and produced low
levels of readthrough transcripts in the absence or the presence of the
M2 protein, correlating with the absence of SH/G polycistronic
transcripts in RS virus-infected cells. The F/M2 gene junction was
particularly sensitive to the M2 protein: it efficiently signaled
termination in the absence of the M2 protein but produced high levels
of readthrough transcripts in the presence of the M2 protein. This
result suggests that the M2 protein may regulate its own production by
negative feedback. The data presented here show that the different gene junctions of RS virus do modulate RS virus transcription termination. The M2 protein reduced termination at all gene junctions. The magnitude
of antitermination due to the M2 protein, however, varied at the
different gene junctions. The data presented here indicate that the
mechanism for the regulation of RS virus gene expression is more
complex than was previously appreciated.
*
Corresponding author. Mailing address: Department of
Microbiology, University of Alabama at Birmingham, BBRB, Box 17, Room 366, 845 19th St. South, Birmingham, AL 35294. Phone: (205) 934-0877. Fax: (205) 934-1636. E-mail:
gail_wertz{at}microbio.uab.edu.
Journal of Virology, January 1999, p. 170-176, Vol. 73, No. 1
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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