Related Experiment Videos
Temperature-dependent switching between "wild-type" and "mutant" forms of p53-Val135
1Department of Pathology, University of Cambridge, U.K.
Journal of Molecular Biology
|December 5, 1990
Summary
The mutant p53-Val135 protein acts as an oncogene at 37°C and a tumor suppressor at 30°C, due to temperature-dependent conformational changes affecting its function.
Area of Science:
- Molecular Biology
- Oncology
- Protein Biochemistry
Background:
- The p53 gene is a critical tumor suppressor.
- Mutations in p53 can lead to oncogenic activation.
- The p53-Val135 mutant exhibits temperature-sensitive behavior.
Purpose of the Study:
- To investigate the molecular mechanism of temperature sensitivity in p53-Val135.
- To understand how temperature affects p53-Val135 protein function and conformation.
Main Methods:
- In vitro translation of p53 mRNAs using rabbit reticulocyte lysate.
- Temperature shifts (30°C and 37°C) during protein synthesis and analysis.
- Immunoreactivity assays and T antigen binding studies.
- Analysis using monoclonal antibodies (PAb246, PAb1620).
Main Results:
- Wild-type p53-Ala135 showed consistent immunoreactivity and T antigen binding across temperatures.
- Mutant p53-Val135 displayed reduced T antigen binding and altered antibody reactivity at 37°C compared to 30°C.
- Temperature shifts induced rapid post-translational conversion between functional phenotypes.
Conclusions:
- Temperature-dependent conformational changes underlie the opposing functions of p53-Val135.
- These conformational variants of p53-Val135 influence cell growth control.
- The study highlights the dynamic nature of mutant p53 protein structure and function.