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Procedures are described for the selection of Escherichia coli mutants that constitutively take up and phosphorylate fructose, and convert it to fructose 1,6-bisphosphate. The phenotype of such mutants is described. The altered regulatory gene, fruC, is highly co-transducible with leu and other markers located at min 2 on the genome. In merozygotes, fruC + is dominant to fruC. Mutants can be readily isolated that are fruC at 42 °C but fruC + at 30 °C; moreover, the integration of a Tn 10 transposon in the genome at min 2converts fruC + strains to fruC. It is therefore likely that the fruC + regulatory gene specifies a repressor protein.
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