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Mutagenesis of a bovine herpesvirus type 1 genome cloned as an infectious bacterial artificial chromosome: analysis of glycoprotein E and G double deletion mutants

¹ Institute of Molecular Biology, Friedrich-Loeffler-Institutes, Federal Research Centre for Virus Diseases of Animals, Boddenblick 5a, D-17498 Insel Riems, Germany
² Institute for Diagnostic Virology, Friedrich-Loeffler-Institutes, Federal Research Centre for Virus Diseases of Animals, Boddenblick 5a, D-17498 Insel Riems, Germany

Correspondence
Martin Beer
beer{at}rie.bfav.de

The genome of bovine herpesvirus type 1 Schönböken was cloned as a bacterial artificial chromosome (BAC) by inserting mini F plasmid sequences into the glycoprotein (g) E gene. The resulting BAC clone, pBHV-1gE, was transfected into bovine kidney cells and viable gE-negative BHV-1 (BHV-1gE) was recovered. By RecE/T mutagenesis in Escherichia coli, the gG open reading frame was deleted from pBHV-1gE. From the mutated BAC, double negative BHV-1gE-gG was reconstituted and its growth properties were compared to those of rescuant viruses in which the gE gene was restored (BHV-1rev, BHV-1gG). The mutant viruses did not exhibit markedly lowered virus titres. Plaque sizes of BHV-1gE, BHV-1gE-gG and BHV-1gG, however, were reduced by 19 to 55 % compared to parental strain Schönböken or BHV-1rev. Our results suggested that gE and gG function independently from each other in cell-to-cell spread, because an additive effect on plaque formation was observed in the gE/gG double deletion mutant.

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