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Journal of Virology, April 2000, p. 3470-3477, Vol. 74, No. 8
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

NP and L Proteins of Lymphocytic Choriomeningitis Virus (LCMV) Are Sufficient for Efficient Transcription and Replication of LCMV Genomic RNA Analogsdagger

Ki Jeong Lee, Isabel S. Novella,Dagger Michael N. Teng,§ Michael B. A. Oldstone, and Juan Carlos de la Torre*

Division of Virology, Department of Neuropharmacology, The Scripps Research Institute, La Jolla, California 92037

Received 23 September 1999/Accepted 13 January 2000

The genome of lymphocytic choriomeningitis virus (LCMV) consists of two negative-sense single-stranded RNA segments, designated L and S. Both segments contain two viral genes in an ambisense coding strategy, with the genes being separated by an intergenic region (IGR). We have developed a reverse genetic system that allows the investigation of cis-acting signals and trans-acting factors involved in transcription and replication of LCMV. To this end, we constructed an LCMV S minigenome consisting of a negative-sense copy of the chloramphenicol acetyltransferase (CAT) reporter gene flanked upstream by the S 5' untranslated region (UTR) and IGR and downstream by the S 3' UTR. CAT expression was detected in LCMV-infected cells transfected with the minigenome RNA. Intracellular coexpression of the LCMV minigenome and LCMV L and NP proteins supplied from cotransfected plasmids driven by the T7 RNA polymerase provided by the recombinant vaccinia virus vTF7-3 resulted in high levels of CAT activity and synthesis of subgenomic CAT mRNA and antiminigenome RNA species. Thus, L and NP represent the minimal viral trans-acting factors required for efficient RNA synthesis mediated by LCMV polymerase.

* Corresponding author. Mailing address: Imm-6, Division of Virology, Department of Neuropharmacology, The Scripps Research Institute, 10550 N. Torrey Pines Rd., La Jolla, CA 92037. Phone: (858) 784-6462. Fax: (858) 784-9981. E-mail: juanct{at}scripps.edu.

dagger Publication 12708-NP from The Scripps Research Institute.

Dagger Present address: Medical College of Ohio, Toledo, OH 43614.

§ Present address: LID/NIAID, Bethesda, MD 20892-0720.

Journal of Virology, April 2000, p. 3470-3477, Vol. 74, No. 8
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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