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Journal of Virology, August 2008, p. 7729-7734, Vol. 82, No. 15
0022-538X/08/$08.00+0 doi:10.1128/JVI.00326-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Department of Molecular Genetics, Section of Virology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195
Received 14 February 2008/ Accepted 12 May 2008
The RNA-dependent RNA polymerase L protein of vesicular stomatitis virus (VSV) elicits GTPase and RNA:GDP polyribonucleotidyltransferase (PRNTase) activities to produce a 5'-cap core structure, guanosine(5')triphospho(5')adenosine (GpppA), on viral mRNAs. Here, we report that the L protein produces an unusual cap structure, guanosine(5')tetraphospho(5')adenosine (GppppA), that is formed by the transfer of the 5'-monophosphorylated viral mRNA start sequence to GTP by the PRNTase activity before the removal of the
-phosphate from GTP by GTPase. Interestingly, GppppA-capped and polyadenylated full-length mRNAs were also found to be synthesized by an in vitro transcription system with the native VSV RNP.
Published ahead of print on 21 May 2008.
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