Modeling the relationship between the p53 C-terminal domain and its binding partners using molecular dynamics

Area of Science:

• Molecular Biology
• Biochemistry
• Computational Biology

Background:

• TP53 gene mutations are implicated in 50% of cancers.
• The p53 C-terminal domain (CTD) is crucial for p53 regulation but intrinsically disordered.
• Understanding p53 CTD interactions is key to cancer research.

Purpose of the Study:

• To investigate the dynamic behavior of the p53 CTD.
• To understand how p53 CTD interacts with its regulatory binding partners.
• To provide a basis for predicting new binding partners and developing p53-targeting inhibitors.

Main Methods:

• Molecular dynamics simulations were employed.
• Simulations focused on the p53 CTD and five known binding partners.
• Analysis of binding site fluctuations and secondary structure changes.

Main Results:

• Distinct fluctuation patterns were observed in the p53 CTD binding site upon association with partners.
• Evidence suggests the hydrophobic pocket size dictates the p53 CTD's secondary structure when bound.
• These findings illuminate the mechanism of p53 CTD-partner interactions.

Conclusions:

• The study elucidates the dynamic interactions of the p53 CTD with its binding partners.
• This work facilitates the prediction of novel p53 CTD binding partners.
• Findings can guide the development of inhibitors to modulate p53 activity for cancer treatment.