TABLE 1

Strains and plasmids used in this study

Strain or plasmidRelevant characteristic(s)Reference or source
Escherichia coli strains
    J53 AzirPlasmid recipient46
    BL21(DE3)Expression hostAgilent Technologies
    M15 pREP4Expression hostQiagen
    EW1bΔtolC47
    RYC1000 pMM39Microcin B17 producer48
Plasmids
    pMG252qnrA11
    pMG253qnrA1 cloned3
    pMG298qnrB127
    pET28a:QnrB1qnrB1 cloned, His6 tagged, IPTG inducible16
    pQE-60-qnrB1qnrB1 cloned, His6 tagged, IPTG inducible27
    pMG306qnrS149