FIG. 5.

The agpA::TnphoA fusion in strain SG1001 is induced by α-galactosides. Strain SG1001 was grown in basal medium supplemented with the indicated sugars. Alkaline phosphatase specific activity was determined 96 h after inoculation, when cells were in stationary phase. The supplemental sugars were present at a concentration of 0.4% (wt/vol). Specific activity of the AgpA′::′PhoA fusion when strain SG1001 was grown in the presence of galactose or isomers of galactose (A); α-galactosides (B); the α-galactoside melibiose or an isomer of melibiose, the α-glucoside isomaltose (C); and β-galactosides (D).