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Inducible Phosphoenolpyruvate-dependent Hexose Phosphotransferase Activities in Escherichia Coli

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Journal Biochem J
Specialty Biochemistry
Date 1972 Aug 1
PMID 4345358
Citations 62
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Abstract

1. A method is described for measuring the rate of phosphoenolpyruvate-dependent phosphotransferase activity for a variety of hexoses in toluene-treated suspensions of Escherichia coli. 2. The specific activities of the phosphotransferases that catalyse the phosphorylation of hexoses are greatly affected by the carbon source for growth. 3. In all strains of E. coli tested, fructose phosphotransferase activity is induced by growth on fructose. 4. Strains of E. coli differ greatly in the rate at which they phosphorylate glucose, but all strains possess at least a low glucose phosphotransferase activity under any tested condition of growth. Glucose phosphotransferase activity is further induced by growth on glucose; this does not occur in a mutant that lacks the ability to take up methyl alpha-d-[(14)C]glucopyranoside and hence grows poorly on glucose. 5. When growing on fructose, two strains of E. coli synthesize the inducible glucose phosphotransferase system gratuitously, and to specific activities higher than observed during growth on glucose. A phosphotransferase catalysing the phosphorylation of mannose is similarly induced.

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