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The reversion behavior of pleiotropic carbohydrate mutants, previously designated asctr , was studied. The mutants revert to complete restoration of the wild-type phenotype, as well as to a spectrum of partial wild-type phenotypes. Lac+ reversions were found in thelac region (11 min) and some Mal+ reversions occurred atmalB (79 min), at a distance from the site of thectr mutations (46 to 47 min). About one-third of Lac+ and Mal+ revertants were constitutive for uptake of their respective substrates, and one-third modified for inducibility. The remaining third were not distinguishable from wild type. Induction of actr mutation in alac constitutive strain, either operator or repressor mutant, did not affect lactose metabolism. A polar-likectr mutant, deficient in both enzyme I and heat-stable protein of the phosphoenolpyruvate-dependent phosphotransferase strain was also described. Partial revertants ofctr were still found to lack enzyme I.

Carbohydrate Accumulation and Metabolism in Escherichia coli: Characteristics of the Reversions of ctr Mutations