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The ability of Escherichia coli W2244 to concentrate methyl-β-thiogalactoside and methyl-α-glucoside was substantially reduced when the cells were subjected to osmotic shock. The shocked cells contained only a fraction of their normal content of a heat-stable protein, previously characterized as a component of a phosphotransferase system. When the shocked cells were incubated with the purified heat-stable protein, the ability to accumulate the glycosides was restored. The results suggest that the phosphotransferase system may be an important component of the glycoside permease systems.
Kündig et al. (1966) studied this question.