TABLE 3.

Effects of different glcT mutations on the expression of the ptsGHI operon^a

Strain	Relevant glcT allele	β-Galactosidase activityb
		CSE	CSE + Glc
QB5448	Wild type	15	490
GP103	glcT1	895	420
GP116	glcT-T102S D103T I109Q	850	640
GP117	glcT-T102S D103T	1,030	675
GP118	glcT-I109Q	30	413

^aAll strains contain a ΔLA ptsG′-′lacZ translational fusion at the amyE locus. The β-galactosidase specific activities were determined as described in footnote a of Table 2. 

^bβ-Galactosidase activity is expressed in units per milligram of protein.