Abstract
A ColE1-based plasmid for transcriptional gene fusions was constructed that contains both the promoterless luxAB genes of Vibrio harveyi and a tet marker within the inverted repeats of a left end-truncated Tn5 element. Introduction of this plasmid into an Escherichia coli strain containing a plasmid (pTF421) that overproduces ColE1 RNA1 (and thus inhibits replication of the ColE1 plasmid) allowed selection for cells that had a single copy of the luxAB operon transposed into the chromosome beginning 5 days post-transformation. The long latent period necessary for Tn5 transposition is analogous to that found in other systems, where transposition frequencies and mutation rates increase in a time-dependent manner when selected for upon prolonged incubation on Petri dishes under bacteriostatic conditions.
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Abbreviations
- Ap:
-
ampicillin
- bp:
-
base pair(s)
- kb:
-
kilobase(s)
- PO:
-
promoter/operator
- R :
-
resistant/resistance
- Tc:
-
tetracycline
- Tn:
-
transposon
- xyl:
-
xylose
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Guzzo, A., DuBow, M.S. Construction of stable, single-copy luciferase gene fusions in Escherichia coli . Arch. Microbiol. 156, 444–448 (1991). https://doi.org/10.1007/BF00245390
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DOI: https://doi.org/10.1007/BF00245390