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Journal of Virology, February 2000, p. 2017-2022, Vol. 74, No. 4
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

De Novo Initiation of RNA Synthesis by Hepatitis C Virus Nonstructural Protein 5B Polymerase

Weidong Zhong,* Annette S. Uss, Eric Ferrari, Johnson Y. N. Lau, and Zhi Hong

Department of Antiviral Therapy, Schering-Plough Research Institute, Kenilworth, New Jersey 07033-0539

Received 14 July 1999/Accepted 18 November 1999

RNA-dependent RNA polymerase (RdRp) encoded by positive-strand RNA viruses is critical to the replication of viral RNA genome. Like other positive-strand RNA viruses, replication of hepatitis C virus (HCV) RNA is mediated through a negative-strand intermediate, which is generated through copying the positive-strand genomic RNA. Although it has been demonstrated that HCV NS5B alone can direct RNA replication through a copy-back primer at the 3' end, de novo initiation of RNA synthesis is likely to be the mode of RNA replication in infected cells. In this study, we demonstrate that a recombinant HCV NS5B protein has the ability to initiate de novo RNA synthesis in vitro. The NS5B used HCV 3' X-tail RNA (98 nucleotides) as the template to synthesize an RNA product of monomer size, which can be labeled by [gamma -32P]nucleoside triphosphate. The de novo initiation activity was further confirmed by using small synthetic RNAs ending with dideoxynucleotides at the 3' termini. In addition, HCV NS5B preferred GTP as the initiation nucleotide. The optimal conditions for the de novo initiation activity have been determined. Identification and characterization of the de novo priming or initiation activity by HCV NS5B provides an opportunity to screen for inhibitors that specifically target the initiation step.

* Corresponding author. Mailing address: Department of Antiviral Therapy, K-15-4/4945, Schering-Plough Research Institute, 2015 Galloping Hill Rd., Kenilworth, NJ 07033-0539. Phone: (908) 740-3025. Fax: (908) 740-3032. E-mail: weidong.zhong{at}spcorp.com.

Journal of Virology, February 2000, p. 2017-2022, Vol. 74, No. 4
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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