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Journal of Virology, October 2001, p. 9106-9113, Vol. 75, No. 19
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.19.9106-9113.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Virion Association of IE62, the Varicella-Zoster Virus (VZV) Major Transcriptional Regulatory Protein, Requires Expression of the VZV Open Reading Frame 66 Protein Kinase

Paul R. Kinchington,1,2,* Karen Fite,1 Amy Seman,2 and Stephanie E. Turse1

Departments of Ophthalmology1 and of Molecular Genetics and Biochemistry,2 School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213

Received 5 April 2001/Accepted 5 July 2001

IE62, the major transcriptional regulatory protein encoded by varicella-zoster virus (VZV), is associated with the tegument of gradient-purified virions. Here, we show that most, if not all, of the association requires the expression of open reading frame 66 (ORF66), a protein kinase. The association of IE62 with wild-type VZV virions was confirmed using immunoelectron microscopy with IE62-specific antibodies, which reacted with virions in ultrathin sections of VZV-infected cells. Fractionated purified virions from cells infected with recombinant VZV ROka contained substantial levels of the 175-kDa virion IE62 protein and also contained the ORF66 protein. However, virions from cells infected with recombinant VZV ROka66S, in which ORF66 is disrupted, lacked not only the ORF66 protein but also most of the virion 175-kDa IE62 polypeptide. The virion-associated protein kinase activity was still present in ROka66S virions, although the 175-kDa protein substrate for the virion kinase was absent, implying that the virion protein kinase is encoded by genes other than ORF66. The very low levels of IE62 in ROka66S virions indicate that ORF66 protein mediates the redistribution of IE62 to sites of tegument assembly. IE62 was resolved into several species from VZV-infected cells which showed mobility differences between ROka and ROka66S, and a specific form of IE62 was detected in ROka virions. These results are consistent with a role for the ORF66-mediated phosphorylation of IE62 that results in cytoplasmic distribution of the regulatory protein for tegument inclusion. They support a model in which VZV tegument acquisition occurs in the cytoplasm. As such, two unusual features of VZV IE62, namely, its virion inclusion and its phosphorylation and nuclear exclusion by the ORF66 protein kinase, are functionally linked.

* Corresponding author. Mailing address: 1020 Eye & Ear Institute, University of Pittsburgh, 203 Lothrop St., Pittsburgh, PA 15213. Phone: (412) 647-6319. Fax: (412) 647-5880. E-mail: Kinchingtonp{at}msx.upmc.edu.

Journal of Virology, October 2001, p. 9106-9113, Vol. 75, No. 19
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.19.9106-9113.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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