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. 1985 Jun;162(3):1092–1099. doi: 10.1128/jb.162.3.1092-1099.1985

Transposable lambda placMu bacteriophages for creating lacZ operon fusions and kanamycin resistance insertions in Escherichia coli.

E Bremer, T J Silhavy, G M Weinstock
PMCID: PMC215888  PMID: 2987183

Abstract

We have constructed several derivatives of bacteriophage lambda that translocate by using the transposition machinery of phage Mu (lambda placMu phages). Each phage carries the c end of Mu, containing the Mu cIts62, ner (cII), and A genes, and the terminal sequences from the Mu S end (beta end). These sequences contain the Mu attachment sites, and their orientation allows the lambda genome to be inserted into other chromosomes, resulting in a lambda prophage flanked by the Mu c and S sequences. These phages provide a means to isolate cells containing fusions of the lac operon to other genes in vivo in a single step. In lambda placMu50, the lacZ and lacY genes, lacking a promoter, were located adjacent to the Mu S sequence. Insertion of lambda placMu50 into a gene in the proper orientation created an operon fusion in which lacZ and lacY were expressed from the promoter of the target gene. We also introduced a gene, kan, which confers kanamycin resistance, into lambda placMu50 and lambda placMu1, an analogous phage for constructing lacZ protein fusions (Bremer et al., J. Bacteriol. 158:1084-1093, 1984). The kan gene, located between the cIII and ssb genes of lambda, permitted cells containing insertions of these phages to be selected independently of their Lac phenotype.

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Selected References

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