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Journal of Virology, October 1999, p. 8843-8847, Vol. 73, No. 10
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Transactivation of Herpes Simplex Virus Type 1 Immediate-Early Gene Expression by Virion-Associated Factors Is Blocked by an Inhibitor of Cyclin-Dependent Protein Kinases

Robert Jordan,* Luis Schang, and Priscilla A. Schaffer

Department of Microbiology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104

Received 7 April 1999/Accepted 25 June 1999

Initiation of productive infection by human herpes simplex virus type 1 (HSV-1) requires cell cycle-dependent protein kinase (cdk) activity. Treatment of cells with inhibitors of cdks blocks HSV-1 replication and prevents accumulation of viral transcripts, including immediate-early (IE) transcripts (26). Inhibition of IE transcript accumulation suggests that virion proteins, such as VP16, require functional cdks to activate viral transcription. In this report, we show that a cdk inhibitor, Roscovitine, blocks VP16-dependent IE gene expression. In the presence of Roscovitine, the level of virion-induced activation of a transfected reporter gene (the gene encoding chloramphenicol acetyltransferase) linked to the promoter-regulatory region of the ICP0 gene was reduced 40-fold relative to that of untreated samples. Roscovitine had little effect on the interaction of VP16 with VP16-responsive DNA sequences as measured by electrophoretic mobility shift assays. These data indicate that VP16-dependent activation of IE gene expression requires functional cdks and that this requirement is independent of the ability of VP16 to bind to DNA.

* Corresponding author. Present address: Department of Biochemistry and Molecular Pharmacology, The Jefferson Center for Biomedical Research, 700 Butler Ave., Doylestown, PA 18901-2697. Phone: (215) 489-4914. Fax: (215) 489-4920. E-mail: Robert.Jordan{at}mail.tju.edu.

Journal of Virology, October 1999, p. 8843-8847, Vol. 73, No. 10
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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Copyright © 1999 by the American Society for Microbiology. All rights reserved.