In support of the view that inducer exclusion is the main factor in diauxie, cAMP–CRP was reported to play a crucial part in diauxie only by activating the transcription of the glucose ...

Görke, B. and Stülke, J. Carbon catabolite repression in bacteria: many ways to make the most out of nutrients. Nature Rev. Microbiol. 6, 613–624 (2008).

coli to control the expression of lac operon genes. This additional system is called catabolite repression. This particular control system is based on the rate of glucose utilization by cells.