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Updated: Jan 20, 2026
Factors Affecting Intrinsically Disordered Proteins
Restoration of the Y220C p53 Full-Length Mutant by PK11000: a Molecular Dynamics Study of an Intrinsically Disordered
Sean Stetson1,2, Fernando Caballero Mancía1,2, Kelly M Thayer1,3,2
1Department of Computer Science, Wesleyan University Middletown, Connecticut 06457, United States.
Abstract:
The tumor suppressor protein p53 plays a key role in cellular homeostasis, with its dysfunction linked to over half of all cases of human cancer. The Y220C mutation in the DNA-binding domain (DBD) destabilizes p53, compromising its function. The most well-studied case of Y220C p53 rescue via a small molecule, PK11000, has been shown to restore stability and reinstate activity both in vitro and in vivo in rodent models. While prior in silico studies have focused on the DBD in isolation, this work explores the full-length p53 protein, incorporating its intrinsically disordered N- and C-terminal regulatory regions, which are known to be sites of extensive post-translational modifications utilized to modulate its activity. Using molecular dynamics (MD) simulations, we investigate the wild-type (WT) p53, the destabilized Y220C mutant, and the PK11000-rescued Y220C variant. Our findings illuminate a multilayered allosteric landscape: the Y220C mutation disrupts DBD stability through long-range effects while PK11000 counteracts this destabilization through its own distal interactions. Importantly, the N- and C-terminal regions mediate additional allosteric regulation, dynamically influencing both the mutation's impact and the rescue mechanism. This triple allosteric framework underscores the regulatory regions' critical role in restoring p53 functionality. By providing a first-order exploration into the behavior of full-length p53, this study advances our understanding of its regulatory mechanisms and sets the stage for developing targeted therapies aimed at reactivating mutant p53 in cancer.
Insights
The Y220C mutation destabilizes tumor suppressor p53 (protein 53), but the small molecule PK11000 can restore its function. This study reveals how full-length p53
Area of Science:
- Molecular Biology
- Biochemistry
- Cancer Research
Background:
- The tumor suppressor protein p53 is crucial for cellular homeostasis.
- Mutations in p53, particularly Y220C in the DNA-binding domain (DBD), lead to protein destabilization and loss of function, contributing to over 50% of human cancers.
- The small molecule PK11000 has shown promise in rescuing Y220C p53 stability and activity.
Purpose of the Study:
- To investigate the allosteric mechanisms governing the stability and function of full-length p53, including its intrinsically disordered N- and C-terminal regions.
- To explore how the Y220C mutation impacts p53 stability and how PK11000 counteracts this effect.
- To elucidate the role of p53's regulatory regions in the Y220C mutation's destabilization and PK11000's rescue mechanism.
Main Methods:
- Utilized molecular dynamics (MD) simulations to analyze wild-type (WT) p53, the Y220C mutant, and the PK11000-rescued Y220C variant.
- Focused on the full-length p53 protein, incorporating its N- and C-terminal regulatory regions, unlike previous studies on the isolated DBD.
- Examined long-range and distal interactions influencing protein stability and function.
Main Results:
- The Y220C mutation destabilizes p53's DBD through long-range effects.
- PK11000 rescues Y220C p53 stability by engaging in distal interactions.
- The N- and C-terminal regions of p53 play a critical role in mediating additional allosteric regulation, influencing both the mutation's impact and the rescue process.
- A triple allosteric framework involving the DBD and terminal regions was identified.
Conclusions:
- The N- and C-terminal regulatory regions are critical for restoring p53 functionality, mediating a triple allosteric regulation.
- Understanding these regulatory mechanisms in full-length p53 is essential for developing targeted therapies to reactivate mutant p53 in cancer.
- This study provides a foundational exploration of full-length p53 dynamics, advancing the understanding of its regulatory network.
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