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Cyclic AMP (cAMP) synthesis in Escherichia coli is altered in cAMP receptor protein mutants and in phosphoenolpyruvate:sugar phosphotransferase transport system mutants. The stimulation of cAMP synthesis observed in cAMP receptor protein-deficient mutants is largely dependent upon enzyme III of the phosphoenolpyruvate:sugar phosphotransferase transport system. The phosphoenolpyruvate:sugar phosphotransferase transport system enzyme I is not required for elevated cAMP synthesis. These results suggest that enzyme III plays an important role in regulating adenylate cyclase activity.

Enzyme III stimulation of cyclic AMP synthesis in an Escherichia coli crp mutant