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Journal of Virology, August 2004, p. 8254-8263, Vol. 78, No. 15
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.15.8254-8263.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Purification of the Cucumber Necrosis Virus Replicase from Yeast Cells: Role of Coexpressed Viral RNA in Stimulation of Replicase Activity{dagger}

Zivile Panaviene, Tadas Panavas, Saulius Serva, and Peter D. Nagy*

Department of Plant Pathology, University of Kentucky, Lexington, Kentucky

Received 22 January 2004/ Accepted 24 March 2004

Purified recombinant viral replicases are useful for studying the mechanism of viral RNA replication in vitro. In this work, we obtained a highly active template-dependent replicase complex for Cucumber necrosis tombusvirus (CNV), which is a plus-stranded RNA virus, from Saccharomyces cerevisiae. The recombinant CNV replicase showed properties similar to those of the plant-derived CNV replicase (P. D. Nagy and J. Pogany, Virology 276:279-288, 2000), including the ability (i) to initiate cRNA synthesis de novo on both plus- and minus-stranded templates, (ii) to generate replicase products that are shorter than full length by internal initiation, and (iii) to perform primer extension from the 3' end of the template. We also found that isolation of functional replicase required the coexpression of the CNV p92 RNA-dependent RNA polymerase and the auxiliary p33 protein in yeast. Moreover, coexpression of a viral RNA template with the replicase proteins in yeast increased the activity of the purified CNV replicase by 40-fold, suggesting that the viral RNA might promote the assembly of the replicase complex and/or that the RNA increases the stability of the replicase. In summary, this paper reports the first purified recombinant tombusvirus replicase showing high activity and template dependence, a finding that will greatly facilitate future studies on RNA replication in vitro.

* Corresponding author. Mailing address: Department of Plant Pathology, University of Kentucky, 201F Plant Science Bldg., Lexington, KY 40546-0312. Phone: (859) 257-7445, ext. 80726. Fax: (859) 323-1961. E-mail: pdnagy2{at}uky.edu.

{dagger} This study is Publication No. 04-12-034 of the Kentucky Agricultural Experiment Station.

Journal of Virology, August 2004, p. 8254-8263, Vol. 78, No. 15
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.15.8254-8263.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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