1. Any catabolite or Anabolite of SAM

2. In this work, we investigated the mechanism of catabolite repression in the bacterium Escherichia coli during growth on lactose, L-Arabinose, and D-xylose

3. In the presence of glucose, the catabolite activator protein (CAP), required for production of the enzymes, remains inactive, and EIIAGlc shuts down lactose permease to prevent transport of lactose into the cell.