Table 2 Bacterial strains used and their features

Escherichia coli

 ATCC10536

Reference strain

 AG100

Wild-type E. coli K-12

[54]

 AG100A

AG100 ΔacrAB::KAN^R

[34, 54, 55]

 AG100A_TET

ΔacrAB mutant AG100, with over-expressing acrF gene; TET^R

[54]

 AG102

ΔacrAB mutant AG100, owing acrF gene markedly over-expressed; TET^R

[56, 57]

 MC4100

Wild type E. coli

[58]

 W3110

Wild type E. coli

[58, 59]

Enterobacter aerogenes

 ATCC13048

Reference strains

 CM64

CHL^R resistant variant obtained from ATCC13048 over-expressing the AcrAB pump

[60]

 EA3

Clinical MDR isolate; CHL^R, NOR^R, OFX^R, SPX^R, MOX^R, CFT^R, ATM^R, FEP^R

[61, 62]

 EA27

Clinical MDR isolate exhibiting energy-dependent norfloxacin and chloramphenicol efflux with KAN^R AMP^R NAL^R STR^R TET^R

[61, 62]

 EA289

KAN sensitive derivative of EA27

[63]

 EA294

EA289 acrA::KAN^R

[63]

 EA298

EA 289 tolC::KAN^R

[63]

Enterobacter cloacae

 ECCI69

Clinical MDR isolates, CHL^R

[7]

 BM67

Clinical MDR isolates, CHL^R

[7]

Klebsiella pneumoniae

 ATCC12296

Reference strains

 KP55

Clinical MDR isolate, TET^R, AMP^R, ATM^R, CEF^R

[64]

 KP63

Clinical MDR isolate, TET^R, CHL^R, AMP^R, ATM^R

[64]

 K24

AcrAB-TolC, Laboratory collection of UNR-MD1, University of Marseille, France

[7]

 K2

AcrAB-TolC, Laboratory collection of UNR-MD1, University of Marseille, France

[7]

Providencia stuartii

[65]

 NEA16

Clinical MDR isolate, AcrAB-TolC

 ATCC29916

Clinical MDR isolate, AcrAB-TolC

 PS2636

Clinical MDR isolate, AcrAB-TolC

 PS299645

Clinical MDR isolate, AcrAB-TolC

Pseudemonas aeruginosa

 PA 01

Reference strains

 PA 124

MDR clinical isolate

[66]