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Journal of Virology, December 2006, p. 11658-11666, Vol. 80, No. 23
0022-538X/06/$08.00+0     doi:10.1128/JVI.01662-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Common and Specific Properties of Herpesvirus UL34/UL31 Protein Family Members Revealed by Protein Complementation Assay{triangledown}

Margit Schnee, Zsolt Ruzsics, Anja Bubeck, and Ulrich H. Koszinowski*

Max von Pettenkofer Institute, Ludwig Maximilians University, Pettenkoferstrasse 9a, 80336 Munich, Germany

Received 2 August 2006/ Accepted 11 September 2006

The proteins encoded by the UL34 and UL31 genes of herpes simplex virus are conserved among herpesviruses. They form a complex that is essential for the egress of the herpesvirus nucleocapsids from the nucleus. In previous work on the homologous protein complex in murine cytomegalovirus (MCMV), we defined their mutual binding domains. Here, we started to map binding domains within the UL34/UL31 proteins of alpha-, beta-, and gammaherpesviruses and to locate other functional properties. A protein complementation assay (PCA) using the TEM-1 ß-lactamase fragments fused to UL31 and UL34 protein homologues was used to study protein-protein interactions in cells. Wild-type MCMV M50 and M53 provided a strong reaction in the PCA, whereas mutants unable to form a complex did not. The homologous pairs of herpes simplex virus type 1, pseudorabies virus, human cytomegalovirus (HCMV), Epstein-Barr virus (EBV), and murine herpes virus 68 proteins also reacted, with the exception of the EBV proteins. Cross-complementation was found to be positive only within the same herpesvirus subfamily. Moreover, the HCMV homologues rescued replication-defective MCMV genomes lacking one or the other gene. We identified the binding site of M53 for M50 in the first conserved region (CR1) (M. Loetzerich, Z. Ruzsics, and U. H. Koszinowski, J. Virol. 80:73-84). Here we show that the CR1 of all tested UL31 proteins contains the UL34 binding site, and chimeric proteins carrying the subfamily-specific CR1 rescued the ability to cross-complement in the PCA.

* Corresponding author. Mailing address: Max von Pettenkofer Institut, Pettenkoferstrasse 9a, 80336 Munich, Germany. Phone: 49-89-5160-5203. Fax: 49-89-5160-5292. E-mail: koszinowski{at}m3401.mpk.med.uni-muenchen.de.

{triangledown} Published ahead of print on 27 September 2006.

Journal of Virology, December 2006, p. 11658-11666, Vol. 80, No. 23
0022-538X/06/$08.00+0     doi:10.1128/JVI.01662-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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