Novel host-vector system for selection and maintenance of plasmid-bearing, streptomycin-dependent Escherichia coli cells in antibiotic-free media |
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Authors: | K Miwa S Nakamori K Sano H Momose |
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Abstract: | A novel system for selection and maintenance of cells carrying a recombinant plasmid has been developed, using the streptomycin-dependent (Smd) Escherichia coli 4D host and a plasmid vector carrying an rpsL gene from an Sm-resistant (Smr) mutant of E. coli which masks the Smd phenotype. Strain 4D carrying the Smr pBR322 plasmid can grow without Sm. Using this host-vector system, we can select for cells carrying an Smr recombinant plasmid and maintain them in antibiotic-free media. |
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