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Journal of Virology, August 1999, p. 6405-6414, Vol. 73, No. 8
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Construction and Transposon Mutagenesis in Escherichia coli of a Full-Length Infectious Clone of Pseudorabies Virus, an Alphaherpesvirus

Gregory A. Smith and Lynn W. Enquist*

Department of Molecular Biology, Princeton University, Princeton, New Jersey 08544

Received 24 February 1999/Accepted 6 May 1999

A full-length clone of the 142-kb pseudorabies virus (PRV) genome was constructed as a stable F plasmid in Escherichia coli. The clone, pBecker1, was colinear with PRV-Becker genomic DNA, lacking detectable rearrangements, deletions, or inversions. The transfection of pBecker1 into susceptible eukaryotic cells resulted in productive viral infection. Virus isolated following transfection was indistinguishable from wild-type virus in a rodent model of infection and spread to retinorecipient regions of the brain following inoculation in the vitreous body of the eye. Mutagenesis of pBecker1 in E. coli with a mini-Tn5-derived transposon enabled the rapid isolation of insertion mutants, identification of essential viral genes, and simplified construction of viral revertants. The serial passage of a viral insertion mutant demonstrated the transposon insertion to be stable. However, the F-plasmid insertion present in the viral gG locus was found to undergo a spontaneous deletion following transfection into eukaryotic cells. The implications of F-plasmid insertion into the viral genome with regard to phenotype and genomic stability are discussed.

* Corresponding author. Mailing address: Department of Molecular Biology, Schultz, Room 301, Princeton University, Princeton, NJ 08544-1014. Phone: (609) 258-2415. Fax: (609) 258-1035. E-mail: lenquist{at}molbiol.princeton.edu.

Journal of Virology, August 1999, p. 6405-6414, Vol. 73, No. 8
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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