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A DNA fragment fromLactobacillus casei that restores growth toEscherichia coli andSalmonella typhimurium ptsH mutants on glucose and other substrates of the phosphoenolpyruvate:carbohydrate phosphotransferase system (PTS) has been isolated. These mutants lack the HPr protein, a general component of the PTS. Sequencing of the cloned fragment revealed the absence ofptsH homologues. Instead, the complementation ability was located in a 120-bp fragment that contained a sequence homologue to the binding site of the Cra regulator from enteric bacteria. Experiments indicated that the reversion of theptsH phenotype was due to a titration of the Cra protein, which allowed the constitutive expression of the fructose operon.

Suppression of the ptsH Mutation in Escherichia coli and Salmonella typhimurium by a DNA Fragment from Lactobacillus casei