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Journal of Virology, December 2001, p. 11307-11318, Vol. 75, No. 23
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.23.11307-11318.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Glycoproteins E and I of Marek's Disease Virus Serotype 1 Are Essential for Virus Growth in Cultured Cells

Daniel Schumacher,1 B. Karsten Tischer,1 Sanjay M. Reddy,2 and Nikolaus Osterrieder1,*

Institute of Molecular Biology, Friedrich-Loeffler-Institutes, Federal Research Centre for Virus Diseases of Animals, D-17498 Insel Riems, Germany,1 and Avian Disease and Oncology Laboratory, United States Department of Agriculture, East Lansing, Michigan 488232

Received 18 June 2001/Accepted 10 August 2001

The role of glycoprotein E (gE) and gI of Marek's disease virus serotype 1 (MDV-1) for growth in cultured cells was investigated. MDV-1 mutants lacking either gE (20Delta gE), gI (20Delta gI), or both gE and gI (20Delta gEI) were constructed by recE/T-mediated mutagenesis of a recently established infectious bacterial artificial chromosome (BAC) clone of MDV-1 (D. Schumacher, B. K. Tischer, W. Fuchs, and N. Osterrieder, J. Virol. 74:11088-11098, 2000). Deletion of either gE or gI, which form a complex in MDV-1-infected cells, resulted in the production of virus progeny that were unable to spread from cell to cell in either chicken embryo fibroblasts or quail muscle cells. This was reflected by the absence of virus plaques and the detection of only single infected cells after transfection, even after coseeding of transfected cells with uninfected cells. In contrast, growth of rescuant viruses, in which the deleted glycoprotein genes were reinserted by homologous recombination, was indistinguishable from that of parental BAC20 virus. In addition, the 20Delta gE mutant virus was able to spread from cell to cell when cotransfected into chicken embryo fibroblasts with an expression plasmid encoding MDV-1 gE, and the 20Delta gI mutant virus exhibited cell-to-cell spread capability after cotransfection with a gI expression plasmid. The 20Delta gEI mutant virus, however, was not able to spread in the presence of either a gE or gI expression plasmid, and only single infected cells were detected by indirect immunofluorescence. The results reported here demonstrate for the first time that both gE and gI are absolutely essential for cell-to-cell spread of a member of the Alphaherpesvirinae.

* Corresponding author. Mailing address: Institute of Molecular Biology, Friedrich-Loeffler-Institutes, Federal Research Centre for Virus Diseases of Animals, Boddenblick 5a, D-17498 Insel Riems, Germany. Phone: 49-38351-7266. Fax: 49-38351-7151. E-mail: klaus.osterrieder{at}rie.bfav.de.

Journal of Virology, December 2001, p. 11307-11318, Vol. 75, No. 23
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.23.11307-11318.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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