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Journal of Virology, April 2001, p. 3993-3998, Vol. 75, No. 8
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.8.3993-3998.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

RNA Replication from the Simian Virus 5 Antigenomic Promoter Requires Three Sequence-Dependent Elements Separated by Sequence-Independent Spacer Regions

Michael A. Keller, Susan K. Murphy,dagger and Griffith D. Parks*

Department of Microbiology and Immunology, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157-1064

Received 22 November 2000/Accepted 23 January 2001

We have previously shown for the paramyxovirus simian virus 5 (SV5) that a functional promoter for RNA replication requires proper spacing between two discontinuous elements: a 19-base segment at the 3' terminus (conserved region I [CRI]) and an 18-base internal region (CRII) that is contained within the coding region of the L protein gene. In the work described here, we have used a reverse-genetics system to determine if the 53-base segment between CRI and CRII contains additional sequence-specific signals required for optimal replication or if this segment functions solely as a sequence-independent spacer region. A series of copyback defective interfering minigenome analogs were constructed to contain substitutions of nonviral sequences in place of bases 21 to 72 of the antigenomic promoter, and the relative level of RNA replication was measured by Northern blot analysis. The results from our mutational analysis indicate that in addition to CRI and CRII, optimal replication from the SV5 antigenomic promoter requires a third sequence-dependent element located 51 to 66 bases from the 3' end of the RNA. Minigenome RNA replication was not affected by changes in the either the position of this element in relation to CRI and CRII or the predicted hexamer phase of NP encapsidation. Thus, optimal RNA replication from the SV5 antigenomic promoter requires three sequence-dependent elements, CRI, CRII and bases 51 to 66.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Wake Forest University School of Medicine, Medical Center Blvd., Winston-Salem, NC 27157-1064. Phone: (336) 716-9083. Fax: (336) 716-9928. E-mail: gparks{at}wfubmc.edu.

dagger Present address: Department of Radiation Oncology, Duke University Medical Center, Durham, NC 27710.

Journal of Virology, April 2001, p. 3993-3998, Vol. 75, No. 8
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.8.3993-3998.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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