TP53-responsive DNA element (p53RE) (p53RE)

TP53-responsive DNA elements (p53REs) are specific nucleotide sequences located within the promoters or enhancers of genes that are transcriptionally regulated by the p53 tumor suppressor protein (Riley et al., 2008, Nature Reviews Molecular Cell Biology). These elements typically consist of two decameric half-sites with the consensus sequence RRRCWWGYYY, which allow the p53 tetramer to bind and initiate the expression of genes involved in cell cycle control, DNA repair, and programmed cell death (Khoo et al., 2014, Cell Death & Differentiation). As the primary site of p53-mediated transcriptional activation, these DNA elements are essential for the guardian of the genome function, preventing the proliferation of cells with damaged DNA (el-Deiry, 1998, Radiation Oncology Investigations). In many cancers, mutations in the TP53 gene result in a protein that can no longer recognize or bind to these specific DNA sequences, leading to the loss of tumor suppression. While the DNA elements themselves are not traditional pharmacological targets like enzymes or receptors, they are the functional focal point for therapies designed to restore p53 activity. Drugs such as Eprenetapopt (APR-246) aim to refold mutant p53 to restore its affinity for these elements, while MDM2 inhibitors like Nutlins increase the concentration of wild-type p53 available to bind these sites (Bykov et al., 2018, Nature Reviews Cancer). Consequently, the occupancy and activation of these DNA elements serve as a critical indicator of the efficacy of p53-targeted cancer therapies.

Other names

p53 response elementp53 binding sitep53-binding DNA motifp53RETP53 binding motif

Restoration or stabilization of p53 protein binding to DNA response elements to reactivate tumor suppressor gene transcription.