. 1999 May;181(9):2883–2888. doi: 10.1128/jb.181.9.2883-2888.1999

TABLE 3.

β-Galactosidase levels from lacZ fusions in wild-type and mutant strains grown in LB medium

lacZ fusion^a	Relevant genotype	β-Galactosidase sp act (U/mg of protein) in cells grown in LB medium^b:		Glucose repression ratio^c
lacZ fusion^a	Relevant genotype	Without glucose	With glucose	Glucose repression ratio^c
TMS922	Wild type	44.0	36.6	1.2
	ptsH1	33.6	33.5	1.0
HUT924	Wild type	21.3	4.5	4.7
	ptsH1	20.6	20.0	1.0
BGL2	Wild type	14.2	2.2	6.5
	ptsH1	15.2	10.5	1.4

All strains were derivatives of strain 168 and had the indicated lacZ fusion integrated as a single copy at the amyE locus.

Data are the averages of three or more determinations, which did not vary by more than 25%. Cultures were grown in LB medium with or without glucose.

The glucose repression ratio was calculated by dividing the enzyme activity found in the culture grown without glucose by the enzyme activity found in the culture grown with glucose.