Table 3.

β-Galactosidase activities inP. aeruginosa strains

StrainRelevant characteristicsβ-Galactosidase activitya (Miller units)
PilimitedPi excess
PAO1(pKZ27)Control3 ± 11 ± 1
PAO1(pPT10.5) ctpH::lacZ 473 ± 21278 ± 8
APC1(pPT10.5) phoU ctpH::lacZ 554 ± 7378 ± 3
PHOB1(pPT10.6) phoB ctpH::lacZ 499 ± 19256 ± 15
PAO1(pPT11.5) ctpL::lacZ 130 ± 13 ± 1
APC1(pPT11.5) phoU ctpL::lacZ 139 ± 4126 ± 5
PHOB1(pPT11.6) phoB ctpL::lacZ 6 ± 02 ± 1
  • a Measured by the method of Miller (15). Values are the means ± standard deviations of at least three separate assays.