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. 1991 Oct;65(10):5348–5356. doi: 10.1128/jvi.65.10.5348-5356.1991

Pseudorabies virus glycoproteins gII and gp50 are essential for virus penetration.

I Rauh 1, T C Mettenleiter 1
PMCID: PMC249015  PMID: 1654444

Abstract

Pseudorabies virus (PrV) glycoproteins gII and gp50 are major constituents of the viral envelope and targets of neutralizing monoclonal antibodies. Both are homologs of essential glycoproteins found in herpes simplex virus, gB (gII) and gD (gp50). We recently isolated a gII-negative PrV deletion mutant on complementing cell lines and established the essential character of gII for PrV replication (I. Rauh, F. Weiland, F. Fehler, G. Keil, and T.C. Mettenleiter, J. Virol. 65: 621-631, 1991). In this report, we describe the isolation of a gp50-negative PrV mutant after constructing cell lines that constitutively express gp50 and phenotypically complement the gp50 defect. Analysis of the gp50- mutant proved that gp50 is essential for PrV replication. Further studies showed that both gII and gp50 are required for viral penetration into target cells. The penetration defect in the gII and gp50 deletion mutants could be overcome by experimental polyethylene glycol-induced membrane fusion. Surprisingly, whereas gII proved to be essential for both penetration and cell-cell spread of the virus, gp50 was required only for penetration and appeared dispensable for direct cell-cell spread.

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Selected References

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