Table 5.

Inability of Ler to complement hns mutation

StrainGenotypeβ-Galactosidase activitya
No plasmidpHNSbpLERc
THK60hns+proU::lacZ200 ± 1627 ± 2137 ± 9
THK62hns proU::lacZ553 ± 1630 ± 6932 ± 17
THK88hns+fimB::lacZ74 ± 226 ± 254 ± 1
THK90hns fimB::lacZ417 ± 830 ± 3475 ± 7
  • a β-Galactosidase activity (in Miller units) present in bacteria containing indicated promoter-reporter fusion ± standard error.

  • b pTHK113 encoding H-NS.

  • c pCVD456 encoding Ler.