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Abstract
Vaccinia virus (VV) is a useful expression vector for many laboratory applications. To date, approximately 60% (∼120) of the VV genes remain uncharacterized. The thought of smallpox being used as a biological weapon has gained attention. In light of this, it is imperative that we continue to study the basic replication of VV, a poxvirus that is closely related to smallpox. A set of plasmid vectors were constructed to generate gene deletions (pZIPPY-NEO/GUS) in VV or for foreign gene expression (pBR-EXPRESS). The vectors contain the Escherichia coli neomycin resistance ( neo) and β-glucuronidase ( gusA) genes as selectable markers to facilitate isolation of recombinant viruses. These are the first transfer vectors to use a neo/gusA selection system. We used these vectors to successfully generate a recombinant D9R deletion mutant of VV and to express E. coli lacZ gene. Results indicate that both vectors are highly suited for their designed purpose.
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