TABLE 2.

Expression of the pelD::lacZ fusion in several backgrounds^a

Strain	Genotype	β-Galactosidase sp act (nmol of product liberated min−1 mg of bacterial dry wt−1)	Derepression ratio
A3485	Wild type	13
A3487	kdgR	644	50
A3486	pecS	42	3
A3489	kdgR pecS	2,581	200

^aCultures were grown at 30°C for 14 h in M63 minimum medium supplemented with glycerol (2 g liter⁻¹). β-Galactosidase activity reflects expression of the pelD::lacZ fusion. The results reported are averages of five independent experiments, each with a standard deviation of less than 20%.