Table 3. Effect of deletion of ampR on QS-regulated virulence phenotypes.

Strain	Pyocyanin productiona		LasA activityb		LasB activityc
	Uninduced	Inducedd	Uninduced	Inducedd	Uninduced	Inducedd
PAO1	22.31±0.18	24.30±1.10	0.37±0.005	0.39±0.004	1.65±0.25	1.54±0.15
PAOΔ ampR	2.29±0.11e	5.74±0.56f	0.26±0.002	0.19±0.002g	0.5±0.03h	0.57±0.08i

^aPyocyanin concentrations were expressed as micrograms of pyocyanin produced per microgram of protein.

^bLasA activity was expressed as change in OD600 per hour per microgram of protein.

^cLasB elastase activity was expressed as change in OD495 per microgram of protein.

^dInduction was carried out with 100 µg/ml of penicillinG.

^e p-value<0.0001 when comparing PAO1 and PAOΔampR.

^f p-value<0.0001 when comparing PAO1 and PAOΔampR.

^g,h p-value of 0.02 when comparing PAO1 and PAOΔampR.

ⁱ p-value of 0.01 when comparing PAO1 and PAOΔampR.