Abstract
The isolation and properties of strains of Escherichia coli carrying mutations affecting either the low affinity transport for gluconate (gene gntU) or the thermoresistant gluconokinase (gene gntK) are described. A lesion of each type was genetically characterized by transduction experiments. Both mutations mapped in the asd region, and the order was malA-glpD-asd-gntU-gntK, with the last two markers at about min 75.78 and 75.86 on the map, respectively. Mutations altering specifically gntU have not been previously reported.
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