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Journal of Virology, February 2001, p. 1888-1898, Vol. 75, No. 4
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.4.1888-1898.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Role of Cyclin D3 in the Biology of Herpes Simplex Virus 1 ICP0

Charles Van Sant,1 Pascal Lopez,1 Sunil J. Advani,1,2 and Bernard Roizman1,*

The Marjorie B. Kovler Viral Oncology Laboratories1 and Department of Radiation and Cellular Oncology,2 The University of Chicago, Chicago, Illinois 60637

Received 19 September 2000/Accepted 16 November 2000

Earlier reports from this laboratory have shown that the promiscuous transactivator infected-cell protein 0 (ICP0) binds and stabilizes cyclin D3, that the binding site maps to aspartic acid 199 (D199), and that replacement of D199 with alanine abolishes binding and reduces the capacity of the mutant virus to replicate in quiescent cells or to cause mortality in mice infected by a peripheral site. The objective of this report was to investigate the role of cyclin D3 in the biology of ICP0. We report the following results. (i) Wild-type ICP0 activates cyclin D-dependent kinase 4 (cdk4) and stabilizes cyclin D1 although ICP0 does not interact with this cyclin. (ii) The D199A mutant virus (R7914) does not activate cdk4 or stabilize cyclin D1, and neither the wild-type nor the mutant virus activates cdk2. (iii) Early in infection of human embryonic lung (HEL) fibroblasts both wild-type and D199A mutant ICP0s colocalize with PML, and in these cells the ND10 nuclear structures are dispersed. Whereas wild-type ICP0 is transported to the cytoplasm between 3 and 9 h. after infection, ICPO containing the D199A substitution remains quantitatively in the nucleus. (iv) To examine the interaction of ICP0 with cyclin D3, we used a previously described mutant carrying a wild-type ICP0 but expressing cyclin D3 (R7801) and in addition constructed a virus (R7916) that was identical except that it carried the D199A-substituted ICP0. Early in infection with R7801, ICP0 colocalized with cyclin D3 in structures similar to those containing PML. At 3 h after infection, ICP0 was translocated to the cytoplasm whereas cyclin D3 remained in the nucleus. The translocation of ICP0 to the cytoplasm was accelerated in cells expressing cyclin D3 compared with that of ICP0 expressed by wild-type virus. In contrast, ICP0 carrying the D199A substitution remained in the nucleus and did not colocalize with cyclin D3. These studies suggest the following conclusions. (i) ICP0 brings to the vicinity of ND10 cyclin D3 and, in consequence, an activated cdk4. The metabolic events occurring at or near that structure and involving cyclin D3 cause the translocation of ICP0 to the cytoplasm. (ii) In the absence of the cyclin D3 binding site in ICP0, cyclin D3 is not brought to ND10, cyclin D is not stabilized, and the function responsible for the translocation of ICP0 is not expressed, and in quiescent HEL fibroblasts the yields of virus are reduced.

* Corresponding author. Mailing address: The Marjorie B. Kovler Viral Oncology Laboratories, The University of Chicago, 910 East 58th St., Chicago, IL 60637. Phone: (773) 702-1898. Fax: (773) 702-1631. E-mail: bernard{at}cummings.uchicago.edu.

Journal of Virology, February 2001, p. 1888-1898, Vol. 75, No. 4
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.4.1888-1898.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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