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Journal of Virology, November 2002, p. 11012-11023, Vol. 76, No. 21
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.21.11012-11023.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Varicella-Zoster Virus (VZV) ORF17 Protein Induces RNA Cleavage and Is Critical for Replication of VZV at 37oC but Not 33oC

Hitoshi Sato, Lawrence D. Callanan, Lesley Pesnicak, Tammy Krogmann, and Jeffrey I. Cohen*

Medical Virology Section, Laboratory of Clinical Investigation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland

Received 15 March 2002/ Accepted 12 July 2002

Varicella-zoster virus (VZV) open reading frame 17 (ORF17) is homologous to herpes simplex virus (HSV) UL41, which encodes the viral host shutoff protein (vhs). HSV vhs induces degradation of mRNA and rapid shutoff of host protein synthesis. An antibody to ORF17 protein detected a 46-kDa protein in VZV-infected cells. While HSV vhs is located in virions, VZV ORF17 protein was not detectable in virions. ORF17 protein induced RNA cleavage, but to a substantially lesser extent than HSV-1 vhs. Expression of ORF17 protein did not inhibit expression from a ß-galactosidase reporter plasmid, while HSV type 1 vhs abolished reporter expression. Two VZV ORF17 deletion mutants were constructed to examine the role of ORF17 in virus replication. While the ORF17 VZV mutants grew to peak titers that were similar to those of the parental virus at 33°C, the ORF17 mutants grew to 20- to 35-fold-lower titers than parental virus at 37°C. ORF62 protein was distributed in a different pattern in the nuclei and cytoplasm of cells infected with an ORF17 deletion mutant at 37°C compared to 33°C. Inoculation of cotton rats with the ORF17 deletion mutant resulted in a level of latent infection similar to that produced by inoculation with the parental virus. The importance of ORF17 protein for viral replication at 37°C but not at 33°C suggests that this protein may facilitate the growth of virus in certain tissues in vivo.

* Corresponding author. Mailing address: Laboratory of Clinical Investigation, Bldg. 10, Rm. 11N228, National Institutes of Health, 10 Center Dr., Bethesda, MD 28092-1888. Phone: (301) 496-5265. Fax: (301) 496-7383. E-mail: jcohen{at}niaid.nih.gov.

Journal of Virology, November 2002, p. 11012-11023, Vol. 76, No. 21
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.21.11012-11023.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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