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Cyclic guanosine 3',5'-monophosphate inhibits the synthesis of beta-galactosidase and tryptophanase in cultures of Escherichia coli growing in minimal media with glucose or glycerol as the carbon source. Cyclic guanosine 3',5'-monophosphate acts at the transcriptional level in the lac operon, it exerts its action at the promoter site of the operon, and requires the presence of functional cyclic adenosine 3',5'-monophosphate receptor protein.

journal of bacteriology

Effect of Cyclic Guanosine 3′,5′-Monophosphate on the Synthesis of Enzymes Sensitive to Catabolite Repression in Intact Cells of <i>Escherichia coli</i>

Effect of Cyclic Guanosine 3′,5′-Monophosphate on the Synthesis of Enzymes Sensitive to Catabolite Repression in Intact Cells of Escherichia coli