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Interaction of Maltose Transport with the Transport of Glucose and Galactosides

In cells of Escherichia coli possessing both maltose and galactoside permease, fluxes via one permease are independent of the substrate for the other permease. However, both fluxes are partially inhibited by glucose or α-methyl glucoside at low concentrations in cells grown on glucose. Neither maltose nor galactosides have an inhibitory effect on glucose permease function. These observations are consistent with the hypothesis that the number of glucose permease systems on the cell surface of such cells is much larger than the number for maltose or galactosides.