This interaction ensures the cell remains in a quiescent state, ready to respond to stress. This evolutionary persistence underscores that the core logic of p53—detecting stress, integrating signals, and deciding between repair and death—is a cornerstone of cellular biology.
Mutant p53 Reactivation: Strategies to Restore Its Tumor-Suppressing Functions
When DNA damage occurs, kinases such as ATM and ATR phosphorylate p53, disrupting its binding to MDM2. Additionally, tumors often exhibit heterogeneity, meaning not all cells may express the target receptors or undergo apoptosis.
It transactivates pro-apoptotic genes such as BAX, PUMA, and NOXA while repressing anti-apoptotic genes like BCL-2. Depending on the severity of the stress, it can pause the cell cycle to allow repair, trigger programmed cell death, or maintain a state of permanent dormancy to prevent the propagation of mutations.
Reactivating Mutant p53: Strategies to Restore Cancer's Guardian Function
By upregulating p21, p53 effectively halts the cell cycle at the G1/S checkpoint, preventing the replication of damaged DNA. The Molecular Mechanism of Activation Under normal conditions, the p53 protein is kept at low levels by MDM2, an E3 ubiquitin ligase that tags it for destruction.
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