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J Bacteriol. 1987 February; 169(2): 687-693

Cloning of genes from members of the family Enterobacteriaceae with mini-Mu bacteriophage containing plasmid replicons.

ABSTRACT

An in vivo cloning system that uses derivatives of the Escherichia coli bacteriophage Mu with plasmid replicons has been extended to five different species of the family Enterobacteriaceae. Mu and these mini-Mu replicon elements were introduced into strains of E. coli, Shigella flexneri, Salmonella typhimurium, Citrobacter freundii, and Proteus mirabilis by infection, by transformation, or by conjugation with newly constructed broad-host-range plasmids containing insertions of these elements. Lysates from these cells, lysogenic for Mu and mini-Mu elements, were used to infect sensitive recipient strains of E. coli, S. typhimurium, and C. freundii. Drug-resistant transductants had mini-Mu replicon elements with inserts of different DNA sequences. All of the lysogens made could be induced to yield high phage titers, including those coming from strains that were resistant to Mu and Mu derivatives. Clones of 10 particular genes were isolated by their ability to complement specific mutations in the recipient strains, even in the presence of the E. coli K-12 restriction system. Some of the mini-Mu replicon elements used contained lac gene fusing segments and resulted in fusions of the lac operon to control regions in the cloned sequences.

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