p53 response element (p53RE) (p53RE)

The p53 response element (p53RE) is a specific genomic DNA sequence that serves as the primary binding site for the p53 tumor suppressor protein, often referred to as the guardian of the genome (Vogelstein et al., 2000, Nature). These elements typically follow a consensus motif consisting of two decameric half-sites (5-RRRCWWGYYY-3) separated by a spacer of 0 to 13 base pairs (Riley et al., 2008, Nat Rev Mol Cell Biol). When p53 binds to these sites, it functions as a sequence-specific transcription factor, recruiting co-activators to initiate the expression of downstream target genes such as CDKN1A (p21), BAX, and MDM2. This transcriptional program is essential for mediating cellular responses to stress, including DNA repair, cell cycle arrest, and apoptosis. In the context of oncology, many p53 mutations disrupt the protein's ability to recognize or bind to these DNA sites, thereby abrogating its tumor-suppressive capacity. Therapeutic interventions, such as APR-246 (Eprenetapopt) and Nutlins, aim to restore or enhance p53 binding to these response elements to reactivate the apoptotic pathway in malignant cells (Bykov et al., 2018, Nat Rev Cancer). Consequently, the p53RE represents the critical regulatory node where p53-mediated signaling is translated into biological outcomes.

Other names

p53 binding sitep53-binding elementp53-responsive elementp53REp53 response element DNA

Restoration of p53 transcriptional activity by promoting the folding of mutant p53 or preventing the MDM2-mediated degradation of wild-type p53, thereby facilitating sequence-specific binding to DNA response elements.