Nucleic Acids Research, 1992, Vol. 20, No. 3 495-500
© 1992
MOLECULAR BIOLOGY |
Highly efficient generation of recombinant baculoviruses by enzymatically mediated site-specific in vitro recombination
Department of Cell Biology, Wellcome Research Laboratories South Eden Park Road, Beckenham, Kent BR3 3BS, UK
Received October 23, 1991. Revised February 7, 1992. Accepted February 7, 1992.
We have used the Cre-lox system of bacteriophage P1 to develop a highly efficient in vitrosystem for construction of recombinant baculoviruses. A positive visual selection has been included to make identification of recombinant viral progeny rapid and straightforward. We report recombination frequencies as high as 5x107 recombinants/µg starting plasmid DNA and under certain conditions, up to 50% of the viral progeny are recombinants. Genes inserted into the baculovirus genome can be readily recovered in a simple one step process and re-inserted after manipulation if required. We have confirmed the structure of recovered plasmids by diagnostic restriction endonuclease digestion and the structure of recombinant viral genomes by Southern analysis. Possible uses and the significance of the system are discussed and experiments currently being done to improve it are described.
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