TABLE 5.

Effect of ChvE level on induction of virB::lacZ

Inducing compound	β-Galactosidase (U) obtained with straina:	Fold induction
	C58ΔvirA(pGP159, pWT121)
HAP	4.4 ± 1.5
+ Arabinose	167 ± 13	38
+ Glucose	46 ± 4	10
HAP + IPTG	6.0 ± 1.4
+ Arabinose	278 ± 8	47
+ Glucose	295 ± 18	50

^a pWT121 directs the controlled high expression of chvE upon addition of IPTG. The data are means ± standard errors of the means for three independent samples. HAP was used at 250 μM. Arabinose and glucose were used at 10 mM. IPTG was used at 1 mM.