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Negative regulation of the pts operon by Mlc: mechanism underlying glucose induction in Escherichia coli

The pts operon of Escherichia coli consists of three genes ptsH, ptsI and crr, each encoding for central components of the phosphoenolpyruvate: carbohydrate phosphotransferase system, HPr, enzyme I and IIAGlc, respectively. Transcription of the pts operon is stimulated when glucose is present in the culture medium. One of the two major promoters, P0, is responsible for this glucose induction. However, no regulatory protein responsible for the glucose induction of the pts operon has been identified yet and molecular mechanism by which glucose stimulates the pts transcription is not known.