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- W2057788830 abstract "A general method has been developed for determining the rate of entry of lactose into cells of Escherichia coli that contain beta-galactosidase. Lactose entry is measured by either the glucose or galactose released after lactose hydrolysis. Since lactose is hydrolyzed by beta-galactosidase as soon as it enters the cell, this assay measures the activity of the lactose transport system with respect to the translocation step. Using assays of glucose release, lactose entry was studied in strain GN2, which does not phosphorylate glucose. Lactose entry was stimulated 3-fold when cells were also presented with readily metabolizable substrates. Entry of omicron-nitrophenyl-beta-D-galactopyranoside (ONPG) was only slightly elevated (1.5-fold) under the same conditions. The effects of arsenate treatment and anaerobiosis suggest that lactose entry may be limited by the need for reextrusion of protons which enter during H+/sugar cotransport. Entry of omicron-nitrophenyl-beta-D-galactopyranoside is less dependent on the need for proton reextrusion, probably because the stoichiometry of H+/substrate cotransport is greater for lactose than for ONPG." @default.
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- W2057788830 date "1978-08-01" @default.
- W2057788830 modified "2023-10-16" @default.
- W2057788830 title "Metabolic control of lactose entry in Escherichia coli" @default.
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- W2057788830 doi "https://doi.org/10.1016/0005-2736(78)90283-3" @default.
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