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. 1992 May;66(5):2754–2762. doi: 10.1128/jvi.66.5.2754-2762.1992

Stable rescue of a glycoprotein gII deletion mutant of pseudorabies virus by glycoprotein gI of bovine herpesvirus 1.

A Kopp 1, T C Mettenleiter 1
PMCID: PMC241031  PMID: 1313900

Abstract

Glycoproteins homologous to glycoprotein B (gB) of herpes simplex virus constitute the most highly conserved group of herpesvirus glycoproteins. This strong conservation of amino acid sequences might be indicative of a common functional role. Indeed, gB homologs have been implicated in the processes of viral entry and virus-mediated cell-cell fusion. Recently, we showed that pseudorabies virus (PrV) lacking the essential gB-homologous glycoprotein gII could be propagated on a cell line expressing the gB homolog of bovine herpesvirus 1, gI(BHV-1), leading to a phenotypic complementation of the gII defect (I. Rauh, F. Weiland, F. Fehler, G. Keil, and T.C. Mettenleiter, J. Virol. 65:621-631, 1991). However, this pseudotypic virus could still replicate only on complementing cell lines, thereby limiting experimental approaches to analyze the effects of the gB exchange in detail. We describe here the construction and isolation of a PrV recombinant, 9112C2, that lacks gII(PrV) but instead stably carries and expresses the gene encoding gI(BHV-1). The recombinant is able to replicate on noncomplementing cells with growth kinetics and final titers similar to those of its gII-positive wild-type PrV parent. Neutralization tests and immunoprecipitation analyses demonstrated incorporation of gI(BHV-1) into 9112C2 virions with concomitant absence of gII(PrV). Analysis of in vitro host ranges of wild-type PrV, BHV-1, and recombinant 9112C2 showed that in cells of pig, rabbit, canine, monkey, or human origin, the plating efficiency of 9112C2 was similar to that of its PrV parent. Exchange of gII(PrV) for gI(BHV-1) in recombinant 9112C2 or by phenotypic complementation of gII- PrV propagated on gI(BHV-1)-expressing cell lines resulted in penetration kinetics intermediate between those of wild-type PrV and BHV-1. In conclusion, we report the first isolation of a viral recombinant in which a lethal glycoprotein mutation has been rescued by a homologous glycoprotein of a different herpesvirus. Our data show that in gII- PrV, gI(BHV-1) in vitro fully complements the lethal defect associated with lack of gII(PrV). These results conclusively demonstrate that gI(BHV-1) in a PrV background can execute all essential functions normally provided by gII(PrV). They also indicate that the origin of gB-homologous glycoproteins influences the penetration kinetics of herpesviruses.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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