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In order to investigate the contribution of the multidrug efflux pumps to cellular resistance to a variety of agents including cationic surfactants, we cloned genes of major drug efflux pumps of Escherichia coli and transformed strain JM109with plasmids encoding those genes.In emrAB-, mdfA- and emrE-recombinants, the resistance to carbonylcyanide-m-chlorophenylhydrazone (CCCP), chloramphenicol, and paraquat, respectively, was increased compared to their parent bearing pUC18. Also, in mdfA- and emrE-recombinants, the resistance to cetyltrimethylammonium bromide (CTAB) was increased. However, no significant effects of abundant numbersof emrD and envCD could be observed on resistance to agents examined.

Resistance to Cationic Surfactants and Some Other Agents of Escherichia coli Recombinants with an Abundant Number of Genes Encoding Drug Efflux Pump.