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Journal of Virology, March 2001, p. 2566-2574, Vol. 75, No. 6
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.6.2566-2574.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Nuclear Localization and Shuttling of Herpes Simplex Virus Tegument Protein VP13/14

Michelle Donnelly and Gillian Elliott*

Virus Assembly Group, Marie Curie Research Institute, The Chart, Oxted, Surrey RH8 0TL, United Kingdom

Received 12 October 2000/Accepted 19 December 2000

The herpes simplex virus type 1 gene UL47 encodes the tegument proteins referred to collectively as VP13/14, which are believed to be differentially modified forms of the same protein. Here we show that the major product of the UL47 gene during transient expression is VP14, suggesting that some feature of virus infection is required to produce VP13. We have tagged VP13/14 with green fluorescent protein and have demonstrated that the protein is targeted efficiently to the nucleus, where it often localizes in numerous punctate domains. Furthermore, we show that removal of the N-terminal 127 residues of the protein abrogates nuclear accumulation, and we have identified a 14-amino-acid peptide from this region that is sufficient to function as a nuclear targeting signal and transport a heterologous protein to the nucleus. This short peptide contains two runs of four arginine residues, suggesting that the VP13/14 nuclear localization signal may behave in a manner similar to that of the arginine-rich nuclear localization signals of the retrovirus transactivator proteins Tat, Rev, and Rex. In addition, by using heterokaryon assays, we show that VP13/14 is capable of shuttling between the nucleus and cytoplasm of the cell, a property that may be attributed to three leucine-rich stretches in the C-terminal half of the protein that again bear similarity to the nuclear export signals of Rev and Rex. This is the first demonstration of a tegument protein that is specifically targeted to the nucleus, a feature which may be relevant both during virus entry, when VP13/14 enters the cell as a component of the tegument, and at later times, when large amounts of newly synthesized VP13/14 are present within the cell.

* Corresponding author. Mailing address: Virus Assembly Group, Marie Curie Research Institute, The Chart, Oxted, Surrey RH8 0TL, United Kingdom. Phone: 441883 722306. Fax: 441883 714375. E-mail: g.elliott{at}mcri.ac.uk.

Journal of Virology, March 2001, p. 2566-2574, Vol. 75, No. 6
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.6.2566-2574.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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