Catabolite and transient repression in Escherichia coli do not require enzyme I of the phosphotransferase system.

Transient and catabolite repression with changes in intracellular concentrations of cyclic adenosine 3',5-monophosphate is produced by glycerol and by glucose-6-phosphate in a strain with a partial deletion of the structural gene for enzyme I of the phosphoenolpyruvate:sugar phosphotransferase system.