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Journal of Virology, March 2005, p. 3797-3806, Vol. 79, No. 6
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.6.3797-3806.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Identification of an Essential Domain in the Herpes Simplex Virus 1 UL34 Protein That Is Necessary and Sufficient To Interact with UL31 Protein

Li Liang and Joel D. Baines*

Department of Microbiology and Immunology, Cornell University, Ithaca, New York

Received 23 August 2004/ Accepted 21 October 2004

Previous results have indicated that the herpes simplex virus 1 UL31 and UL34 proteins interact and form a complex at the inner nuclear membranes of infected cells, where both play important roles in the envelopment of nucleocapsids at the inner nuclear membrane. In the work described here, mapping studies using glutathione S-transferase pull-down assays indicated that amino acids 137 to 181 of the UL34 protein are sufficient to mediate an interaction with the UL31 protein. A recombinant virus (v3480) lacking UL34 codons 138 to 181 was constructed. Similar to a UL34 null virus, v3480 failed to replicate on Vero cells and grew to a limited extent on rabbit skin cells. A UL34-expressing cell line restored v3480 growth and plaque formation. Similar to the localization of UL31 protein in cells infected with a UL34 null virus, the UL31 protein was present in the nuclei of Hep2 cells infected with v3480. Hep2 cells infected with v3480 contained the UL34 protein in the cytoplasm, the nucleus, and the nuclear membrane, and this was noted to be similar to the appearance of cells infected with a UL31 null virus. In transient expression assays, the interaction between UL34 amino acids 137 to 181 and the UL31 protein was sufficiently robust to target green fluorescent protein and emerin to intranuclear sites that contained the UL31 protein. These data indicate that amino acids 137 to 181 of the UL34 protein are (i) sufficient to mediate interactions with the UL31 protein in vitro and in vivo, (ii) necessary for the colocalization of UL31 and UL34 in infected cells, and (iii) essential for normal viral replication.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Cornell University, Ithaca, NY 14853. Phone: (607) 253-3391. Fax: (607) 253-3384. E-mail: jdb11{at}cornell.edu.

Journal of Virology, March 2005, p. 3797-3806, Vol. 79, No. 6
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.6.3797-3806.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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