Cloning and insertional inactivation of the dye (sfrA) gene, mutation of which affects sex factor F expression and dye sensitivity of Escherichia coli K-12.


Deletions of the Escherichia coli K-12 chromosome between trpR and thr render the bacterium sensitive to the dye toluidine blue (Dye-), and if male (Hfr or F'), the strain is sterile (Fex-), failing to donate F' or chromosomal markers and resistant to male-specific phages as a consequence of its inability to elaborate F pili. A 6-kilobase SalI fragment of E… (More)


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