title: Correlation of resistance to proflavine and penicillin in Escherichia coli.
abstract: A number of proflavine (PF)-resistant mutants of Escherichia coli B were also resistant to penicillin and cephalothin. Mutants resistant to 1.0 mM PF were 10 times more penicillin resistant than were the PF-susceptible, wild-type cells. Single-step mutants selected for resistance to either PF or penicillin were also resistant to the other drug. None of the resistant mutants tested possessed beta-lactamase activity. These results suggest that resistance to PF and penicillin in E. coli B may be due to permeability changes in the cell envelope.
mesh_terms: D000166:Acridines / Q000494:pharmacology*; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D004926:Escherichia coli / Q000187:drug effects*; D010403:Penicillin Resistance; D010406:Penicillins / Q000494:pharmacology*; D010539:Permeability; D011370:Proflavine / Q000494:pharmacology*
chemical_list: D000166:Acridines; D000900:Anti-Bacterial Agents; D010406:Penicillins; D011370:Proflavine