L. Pumbwe et Ljv. Piddock, Two efflux systems expressed simultaneously in multidrug-resistant Pseudomonas aeruginosa, ANTIM AG CH, 44(10), 2000, pp. 2861-2864
Simultaneous overexpression of MexAB-OprM and MexEF-OprN was demonstrated f
or a multiply antibiotic-resistant clinical isolate of Pseudomonas aerugino
sa (G49). G49 also had decreased expression of OprF. No mutations in mexR o
r its upstream promoter region, mexT, oprM, oprF, or sigX were revealed, su
ggesting regulation by a hitherto undescribed locus.