Figure 3
From: Cell cycle arrest through indirect transcriptional repression by p53: I have a DREAM
The p53–p21–DREAM–E2F/CHR pathway. Indirect p53-dependent repression through DREAM. Induction of p53 leads to downregulation of genes. This regulation is indirect as p53 does not bind to the regulated genes. Instead, induction of p21/CDKN1A expression by p53 causes hypophosphorylation of p107 and p130. Hypophosphorylation of these pRB-related pocket proteins facilitates DREAM formation. DREAM complexes then displace the activating complexes FOXM1–B-MYB-MuvB (FOXM1-MMB) and E2F1-3/DP on the target promoters. (In the figure, LIN54 is the only labeled MuvB component.) Overall, this switch causes previously activated genes to be indirectly downregulation by p53
