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J. Virol., Apr 1997, 2731-2739, Vol 71, No. 4
Copyright © 1997, American Society for Microbiology

Pseudorabies virus recombinants expressing functional virulence determinants gE and gI from bovine herpesvirus 1.1

AC Knapp and LW Enquist
Department of Molecular Biology, Princeton University, New Jersey 08544, USA.

In the Alphaherpesvirinae subfamily, the gE and gI genes are conserved and encode membrane glycoproteins required for efficient pathogenesis (virulence). The molecular mechanism(s) responsible is not well understood, but the existence of similar phenotypes of gE and gI mutations in diverse Alphaherpesvirinae implies conservation of function(s). In this report, we describe construction of pseudorabies virus (PRV) recombinants that efficiently express the bovine herpesvirus 1 (BHV-1) membrane proteins gI and gE at the PRV gG locus. Each BHV-1 gene was cloned in a PRV mutant lacking both the PRV gI and gE coding sequences. All recombinant viruses expressed the BHV-1 proteins at levels similar to or greater than that observed after infection with parental BHV-1, and there were no observable differences in processing or ability to form gE-gI oligomers. The important observation resulting from this report is that the BHV-1 gE and gI proteins functioned together to complement the virulence defect of PRV lacking its own gE and gI genes in a rodent model, despite being derived from a highly restricted host range virus with a different pathogenic profile.


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Copyright © 1997 by the American Society for Microbiology. All rights reserved.