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Insights into the Dissociation Process and Binding Pattern of the BRCT7/8-PHF8 Complex
Longxiao Yuan1, Xiaodan Liang2, Lei He3
1State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University, Tianjin 300353, China.
ACS Omega
|May 20, 2024
Summary
DNA topoisomerase 2-binding protein 1 (Topbp1) is vital for DNA repair. Disrupting its interaction with PHF8, by targeting the BRCT7/8 domain, could offer new cancer treatment strategies by understanding the dissociation mechanism.
Area of Science:
- Molecular Biology
- Biochemistry
- Computational Biology
Background:
- DNA topoisomerase 2-binding protein 1 (Topbp1) activates the ATR complex for DNA damage repair.
- PHF8 must dissociate from Topbp1 for ATR activation.
- Topbp1 binds PHF8's acidic patch sequence (APS) via its C-terminal BRCT7/8 domain, presenting a therapeutic target.
Purpose of the Study:
- To investigate the dissociation process and binding patterns between the BRCT7/8 domain of Topbp1 and PHF8.
- To identify key molecular interactions and residues involved in the dissociation.
- To provide insights for developing targeted cancer therapies.
Main Methods:
- Steered molecular dynamics (SMD) simulations.
- Accelerated molecular dynamics (aMD) simulations.
- Self-organizing maps (SOM) and time-resolved force distribution analysis (TRFDA).
Main Results:
- Dissociation of PHF8 from BRCT7/8 initiates at the N-terminus, causing N-terminal helix unfolding.
- Specific critical residues were identified as pivotal in the dissociation process.
- Detailed molecular insights into the BRCT7/8-PHF8 interaction dynamics were obtained.
Conclusions:
- Understanding the PHF8-Topbp1 dissociation mechanism is crucial for cancer therapy.
- Targeting the BRCT7/8 domain interaction offers a potential strategy for novel drug development.
- This research provides a foundation for designing Topbp1-based cancer treatments.
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