# Degrade the damaged p53 protein rather than trying to repair it

Source: https://onco.cc/ideas/idea-bio1-mutant-p53-degrader/  
OnCo record `idea-bio1-mutant-p53-degrader` (Idea). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

Some faulty p53 proteins do not just stop protecting the cell; they actively help the cancer. Removing them entirely may be easier than fixing them.

## Summary

Gain-of-function mutant p53 accumulates to high levels because it escapes MDM2-mediated turnover, and it drives invasion and chemoresistance in mouse models. A selective degrader exploiting the mutant's dependence on HSP90 or its distinct conformation could deplete it. Precedent: HSP90 inhibitors destabilise mutant p53 and prolong survival in mutant-p53 mouse models, but are too toxic; a targeted degrader would separate the effect from global chaperone inhibition.

## Fields

- Kind: Idea
- Last checked: 2026-09-08
- Hypothesis: Selective depletion of gain-of-function mutant p53 reduces metastasis and restores chemotherapy sensitivity in mutant-p53 models without affecting wild-type p53 in normal tissue.
- Rationale: Mutant p53 accumulation is a distinguishing feature of tumour cells, which gives a natural therapeutic index; degradation is the modality of choice for proteins whose function is structural rather than enzymatic.
- Proposed test: Degrader discovery against R175H and R273H with conformation-selective binders; validate in genetically engineered mutant-p53 mouse models measuring metastasis and chemosensitivity.
- Maturity: speculative
- Actor: research

## Sources

- Bottleneck evidence (The undruggable drivers): Dang et al., Drugging the 'undruggable' cancer targets (Nature Reviews Cancer 2017): https://doi.org/10.1038/nrc.2017.36

## Connected records

- technologies: [PROTACs & molecular glues (targeted protein degradation)](https://onco.cc/technologies/protac-degrader/)
- targets: [TP53](https://onco.cc/targets/tp53/)
- pathways: [p53 / RB / cell-cycle checkpoint](https://onco.cc/pathways/p53-cell-cycle/)
- bottlenecks: [The undruggable drivers](https://onco.cc/bottlenecks/b-undruggable-targets/)
- key papers: [Drugging the 'undruggable' cancer targets](https://onco.cc/key-papers/paper-dang-nat-rev-cancer/)

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