Previous Article | Next Article ![]()
J. Virol., 09 1997, 6455-6464, Vol 71, No. 9
RS Tirabassi, RA Townley, MG Eldridge and LW Enquist
Glycoprotein E (gE) gene of pseudorabies virus (PRV) is conserved among
diverse alphaherpesviruses and therefore is predicted to be important for
virus survival. gE contributes to viral spread from cell to cell in a
variety of hosts and is responsible, in part, for increased virulence or
pathogenesis of the virus. Virulence and spread mediated by gE are thought
to be highly correlated. We initiated this study to explore the hypothesis
that these two phenotypes might reflect separate functions of the gE
protein. We did so by focusing on the role of the gE carboxy terminus in
neuronal spread. Viruses harboring nonsense mutations affecting the
expression of the gE cytoplasmic domain had several notable phenotypes.
First, the truncated gE proteins expressed from these mutants are not found
in virion envelopes. Second, the mutants retain the ability to spread to
all retinorecipient regions of the rodent brain after retinal infection of
rats. Third, the mutants have the reduced virulence phenotype of a gE
deletion mutant in rats. Finally, the mutants have distinct plaque-size
phenotypes on MDBK cells but not PK15 cells. Based on these observations,
we suggest that gE- mediated virulence and spread may reflect separate
functions that are not mediated by gE on virus particles.
Copyright © 1997, American Society for Microbiology
Characterization of pseudorabies virus mutants expressing carboxy- terminal truncations of gE: evidence for envelope incorporation, virulence, and neurotropism domains
Department of Molecular Biology, Princeton University, New Jersey 08544, USA.
This article has been cited by other articles:
| J. Bacteriol. | Mol. Cell. Biol. | Microbiol. Mol. Biol. Rev. |
|---|
| Clin. Vaccine Immunol. | ALL ASM JOURNALS |
|---|