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Journal of Virology, April 1999, p. 3430-3437, Vol. 73, No. 4
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

The Equine Herpesvirus 1 US2 Homolog Encodes a Nonessential Membrane-Associated Virion Component

Alexandra Meindl1,2 and Nikolaus Osterrieder1,*

Institute of Molecular and Cellular Virology, Friedrich-Loeffler-Institutes, Federal Research Center for Virus Diseases of Animals, D-17498 Insel Riems,1 and Institute for Medical Microbiology, Infectious and Epidemic Diseases, Ludwig-Maximilians-University, D-80539 Munich,2 Germany

Received 26 October 1998/Accepted 23 December 1998

Experiments were conducted to analyze the equine herpesvirus 1 (EHV-1) gene 68 product which is encoded by the EHV-1 US2 homolog. An antiserum directed against the amino-terminal 206 amino acids of the EHV-1 US2 protein specifically detected a protein with an Mr of 34,000 in cells infected with EHV-1 strain RacL11. EHV-1 strain Ab4 encodes a 44,000-Mr Us2 protein, whereas vaccine strain RacH, a high-passage derivative of RacL11, encodes a 31,000-Mr Us2 polypeptide. Irrespective of its size, the US2 protein was incorporated into virions. The EHV-1 US2 protein localized to membrane and nuclear fractions of RacL11-infected cells and to the envelope fraction of purified virions. To monitor intracellular trafficking of the protein, the green fluorescent protein (GFP) was fused to the carboxy terminus of the EHV-1 US2 protein or to a truncated US2 protein lacking a stretch of 16 hydrophobic amino acids at the extreme amino terminus. Both fusion proteins were detected at the plasma membrane and accumulated in the vicinity of nuclei of transfected cells. However, trafficking of either GFP fusion protein through the secretory pathway could not be demonstrated, and the EHV-1 US2 protein lacked detectable N- and O-linked carbohydrates. Consistent with the presence of the US2 protein in the viral envelope and plasma membrane of infected cells, a US2-negative RacL11 mutant (L11Delta US2) exhibited delayed penetration kinetics and produced smaller plaques compared with either wild-type RacL11 or a US2-repaired virus. After infection of BALB/c mice with L11Delta US2, reduced pathogenicity compared with the parental RacL11 virus and the repaired virus was observed. It is concluded that the EHV-1 US2 protein modulates virus entry and cell-to-cell spread and appears to support sustained EHV-1 replication in vivo.

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

Journal of Virology, April 1999, p. 3430-3437, Vol. 73, No. 4
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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