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Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
DNA-Bound p53-DNA-Binding Domain Interconverts between Multiple Conformations: Implications for Partner Protein
Sayan Bhattacharjee1, Sujoy Mukherjee1, Siddhartha Roy2
1Department of Structural Biology and Bioinformatics, CSIR-Indian Institute of Chemical Biology, 4, Raja S.C. Mullick Road, Kolkata 700032, India.
Hub proteins like p53 utilize dynamic conformational changes to interact with diverse partners. DNA binding induces these crucial protein dynamics, enabling p53
Area of Science:
- Molecular biology
- Biophysics
Background:
- Protein-protein interaction networks are essential for cellular regulation.
- Hub proteins, central to these networks, interact with numerous partners.
- A hypothesis suggests conformational dynamics enable hub protein interactions.
Purpose of the Study:
- To investigate the dynamics of the p53 DNA-binding domain.
- To test the hypothesis that conformational flexibility is key to p53's function.
Main Methods:
- Utilized 15N-NMR Carr-Purcell-Meiboom-Gill relaxation methods.
- Analyzed the dynamics of the p53 DNA-binding domain in both free and DNA-bound states.
Main Results:
- Detected microsecond to millisecond timescale conformational exchanges in the DNA-bound p53 domain.
- Observed no detectable dynamics at this timescale in the free p53 domain.
- Demonstrated that DNA binding promotes conformational exchange in p53.
Conclusions:
- DNA binding induces conformational dynamics in the p53 DNA-binding domain.
- This dynamic conformational repertoire is crucial for p53's interaction with multiple partners.
- Supports the hypothesis that conformational flexibility is vital for hub protein function.
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