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  • Title: beta-D-phosphogalactoside galactohydrolase of Streptococcus faecalis and the inhibition of its synthesis by glucose.
    Author: Heller K, Röschenthaler R.
    Journal: Can J Microbiol; 1978 May; 24(5):512-9. PubMed ID: 418859.
    Abstract:
    The lactose hydrolysing system of Streptococcus faecalis is described. It is closely related to that one of the group N streptocci as it consists of a beta-D-phosphogalactoside galactohydrolase (beta-Pgal). The uptake of methyl-beta-D-thiogalactoside (TMG), lactose, and glucose is maintained by the phosphoenolpyruvate-dependent phosphotransferase system (PTS) but the uptake of galactose is not. The induction time is 6--7 min. Inducers are lactose and galactose but not isopropyl-beta-D-galactoside (IPTG) and TMG. In the presence of glucose, mannose, and maltose no induction of beta-Pgal occurs but pyruvate and glycerol allow induction. The competitive inhibition of uptake of TMG by glucose suggests inducer exclusion by this sugar. TMG accumulates in the cells exclusively as a derivative.
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